Relevant bibliographies by topics / High speed engines

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'High speed engines'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "High speed engines"

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Shatrov, Mikhail G., Vladimir V. Sinyavski, Andrey Yu Dunin, Ivan G. Shishlov, and Andrey V. Vakulenko. "METHOD OF CONVERSION OF HIGH- AND MIDDLE-SPEED DIESEL ENGINES INTO GAS DIESEL ENGINES." Facta Universitatis, Series: Mechanical Engineering 15, no. 3 (2017): 383. http://dx.doi.org/10.22190/fume171004023s.

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The paper aims at the development of fuel supply and electronic control systems for boosted high- and middle-speed transport engines. A detailed analysis of different ways of converting diesel engine to operate on natural gas was carried out. The gas diesel process with minimized ignition portion of diesel fuel injected by the Common Rail (CR) system was selected. Electronic engine control and modular gas feed systems which can be used both on high- and middle-speed gas diesel engines were developed. Also diesel CR fuel supply systems were developed in cooperation with the industrial partner, namely, those that can be mounted on middle-speed diesel and gas diesel engines. Electronic control and gas feed systems were perfected using modeling and engine tests. The high-speed diesel engine was converted into a gas diesel one. After perfection of the gas feed and electronic control systems, bench tests of the high-speed gas diesel engine were carried out showing a high share of diesel fuel substitution with gas, high fuel efficiency and significant decrease of NOх and СО2 emissions.
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LEJDA, Kazimierz. "Injection systems of high-speed diesel engines and development trends." Combustion Engines 123, no. 4 (2005): 19–30. http://dx.doi.org/10.19206/ce-117366.

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Current development of automotive industry is conditioned by the minimization of negative effects in relation to the environment. It results from the restrictions regarding exhaust emission limits which are introduced by the consecutive standards but it also guarantees market success of a given vehicle. Research carried out regarding customer preferences in UE countries have confirmed that during the purchase of a car they make decisions based on vehicle’s ecological properties and the safety of use in road conditions. Next such criteria follow as performance and durability which has so far been dominant. The analysis of the development trends of internal combustion engines clearly shows that the dominant engines are direct injection compression-ignition VGT engines. These engines have better work indices, significant values of total efficiency and most favorable ecological properties as opposed to spark-ignition engine. The obtainment of desirable utilization indices by diesel engine depends to a high degree from the injection systems applied in these engines. In the article characteristics of injection systems which are fitted in modern high-speed diesel engines as prime vehicle drive unit have been discussed. Systems with distributor injection pumps, with individual injection units and with pressure accumulators have too been presented. The requirements from injection systems have been qualified herein.
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Kadirov, Sarvar, Madamin Aripdjanov, Obidjon Ergashev, and Ravshan Iskandarov. "Features of the working process of high-speed diesel engines." E3S Web of Conferences 264 (2021): 04021. http://dx.doi.org/10.1051/e3sconf/202126404021.

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This article discusses the main history of the creation of high-speed short-stroke diesel engines and an assessment of the main factors that most significantly affect the working process of a diesel engine. When developing a new design of a high-speed diesel engine, it is necessary to pay special attention to the following factors: the intensity of the air charge, injection pressure parameters, the shape of the combustion chamber and the choice of the best option. Research carried out with a 7 x 0.15 mm nozzle in a wide range of speed changes (n = 1000 + 2800 min-1) shows that it is possible to find a position of the widened valve at which optimal results are obtained at medium and high rotational speeds, and on small - engine performance will deteriorate slightly.
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Avrashkov, V. N., E. S. Metelkina, and D. V. Meshcheryakov. "Investigation of High-Speed Ramjet Engines." Combustion, Explosion, and Shock Waves 46, no. 4 (2010): 400–407. http://dx.doi.org/10.1007/s10573-010-0054-0.

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Snyder, W. E., M. R. Wright, and S. G. Dexter. "A Natural Gas Engine Combustion Rig With High-Speed Photography." Journal of Engineering for Gas Turbines and Power 110, no. 3 (1988): 334–42. http://dx.doi.org/10.1115/1.3240126.

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Engines today must satisfy stringent emission requirements but must at the same time have low fuel consumption. One method of approaching both of these goals in spark-ignited natural gas engines is with lean combustion. The use of as much as 80 percent excess air significantly reduces the peak combustion temperature and, as compared to a stoichiometric engine, reduces the NOx emissions by up to 90 percent and the fuel consumption by up to 15 percent. One limitation on lean combustion, however, is the high energy needed for ignition. In larger engines, a small prechamber containing an easily ignitable near-stoichiometric mixture has proved to be both successful and popular as one method of producing the necessary high ignition energy. Although this form of stratified charge combustion has been known for many years, its development has largely been the result of “cut and try” procedures. Lack of access for suitable instrumentation, combined with the difficulty of isolating the individual variables which affect performance, has limited the fundamental understanding of the mechanism of prechamber combustion. This paper summarizes results from a research program where a constant-volume combustion rig is used to simulate engine operation. Emphasis is placed on high-speed photography of the prechamber combustion. A second program on a single-cylinder prechamber spark-ignited gas engine and a third on a multiple-cylinder engine will be reported in subsequent papers.
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Chen, G., P. L. Flynn, S. M. Gallagher, and E. R. Dillen. "Development of the Low-Emission GE-7FDL High-Power Medium-Speed Locomotive Diesel Engine." Journal of Engineering for Gas Turbines and Power 125, no. 2 (2003): 505–12. http://dx.doi.org/10.1115/1.1563241.

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This paper summarizes the technical development of the low-emission GE-7FDL series locomotive diesel engine. The development focused on reducing the engine exhaust NOx emission significantly while reducing and curbing other visible and nonvisible emissions with minimal adverse impact on the engine fuel efficiency and minimal changes to the engine system and components. Concepts were analyzed, and were investigated using a single-cylinder 7FDL research engine. A low-emission 16-cylinder 7FDL engine and a GE locomotive prototype were built and tested for performance demonstration, function evaluation, and design optimization. The GE low-emission 7FDL engines and locomotives have been in production. The newly developed low-emission locomotive engine meets the EPA Tier-0 levels without fuel efficiency penalty. This was accomplished with minimal changes to the engine system and components. The desired engine reliability performance is retained. The engines are interchangeable with the preceding 7FDL baseline models, and the upgrade of the existing baseline engines to the low-emission version is facilitated.
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Lus, Tomasz. "Application of HFRT Methods to Diagnose the Technical Condition of High-Speed Marine Diesel Engines." Solid State Phenomena 236 (July 2015): 161–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.236.161.

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The paper presents problems related to testing of the technical condition of high-speed marine diesel engines that are not equipped with indicated valves, as it is in the case of larger medium-and low-speed marine internal combustion engines. In this case, in assessment of technical condition of engine fuel injection system and valve gear system a vibration signals (in time / angle domain) analysis modified method called HFRT (High Frequency Resonance Technique) can be used. This method indirectly helps also to evaluate the fuel combustion process in the engine cylinders. The paper presents the theoretical basis of a modified HFRT method, physical implementation of the marine diesel engine system’s analyzer used for marine engines testing built at the Institute of Construction and Operation of Ships at Polish Naval Academy (PNA) in Gdynia. The paper also includes a description of the vibration signal processing methodology and examples of measurements made in the ships conditions for a few selected types of engines.
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Mazzawy, Robert S. "Next Generation of Transport Engines." Mechanical Engineering 132, no. 12 (2010): 54. http://dx.doi.org/10.1115/1.2010-dec-6.

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This article discusses the features of very high bypass ratio turbofans and open rotor engines. Each of these engine options has its pros and cons to consider. The very large bypass ratio turbofan engine maintains that the proven capability of containment of blade failures is inherently quieter due to ability to incorporate acoustic treatment in the fan duct and is not subject to high fan tip losses associated with direct exposure to higher cruise level flight speeds. The duct does not come for free, however, and installed weight becomes a primary concern as the increased bypass ratio drives up the engine diameter. Additionally, the fan is subject to higher local airfoil incidence when the fan nozzle un-chokes at low flight speed. The open rotor engine can achieve potentially greater improvements in propulsive efficiency than a turbofan but lacks the containment and noise reduction benefits of a duct. The rotor is also exposed to flight speed, driving up tip losses at today's accepted cruise flight speeds.
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Gaiginschi, Lidia, Iulian Agape, Adrian Sachelarie, and Mihai Alin Girbaci. "Virtual High Speed Diesel Engine – A Simulated Experiment, Part I: Combustion Dynamics." Applied Mechanics and Materials 659 (October 2014): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amm.659.189.

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The research efforts in the direction of internal combustion engines functional cycle simulation, particularly for small capacity diesel engines, are justified by shortening the path between the new conceptual solution and its effects and also to reduce research costs. There can be adopted new organizational and management solutions for the combustion process after these, for example, confirm at the model level. This paper proposes an unizonal physico-mathematical combustion model in high speed small Diesel engines, based on a Vibe-type law and on the heat transfer through the combustion chamber walls modelated after Woschni. The complexity of the model justifies the name of „virtual engine”. This allows to determine the functional parameters as instantaneous and average values, at any engine operating regime. The simulated experiment takes place in perfectly controlled conditions and leads to good results. There are obtained, during the combustion process, dynamics of parameters concerning the vaporization characteristics, combustion characteristics and combustion kinetics, for any operating regime. The parameters are evolving in a predictable way, being experimentally confirmed.
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OPALIŃSKI, Arkadiusz, Michael WILLMANN, and Ulrich MASS. "Turbocharger noises in high speed diesel engines." Combustion Engines 123, no. 4 (2005): 60–64. http://dx.doi.org/10.19206/ce-117370.

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The continuously increasing performance data of the modern diesel engines as well as the fulfillment of the very restricted emission standards cannot be realized without the aid of the turbocharger. Due to the prevalence of the turbo charged engines the customer’s attitude to the emitted noises has been changed. The customer wishes a high power output, but no longer wants to hear it. Thus the consideration of the noise characteristics during the development work is recently as important as the thermodynamic or durability issues. This paper deals with different turbocharger noises, describes its sources, transmission routes and possibilities of noise reduction.
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Dissertations / Theses on the topic "High speed engines"

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Lyes, Peter A. "Low speed axial compressor design and evaluation : High speed representation and endwall flow control studies." Thesis, Cranfield University, 1999. http://hdl.handle.net/1826/4251.

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This Thesis reports the design, build and test of two sets of blading for the Cranfield University low speed research compressor. The first of these was a datum low speed design based on the fourth stage of the DERA high speed research compressor C 147. The emphasis of this datum design was on the high-to-low speed transformation process and the evaluation of such a process through comparing detailed flow measurements from both compressors. Area traverse measurements in both the stationary and rotating frame of reference were taken at Cranfield along with overall performance, blade surface static pressure and flow visualisation measurements. These compare favourably with traverse and performance measurements taken on C147 before commencement of the PhD work. They show that despite the compromises made during the transformation process, due to both geometric and aerodynamic considerations, both the primary and secondary flow features can be successfully reproduced in the low speed environment. The aim of the second design was to improve on the performance of the datum blading through the use of advanced '3D' design concepts such as lean and sweep. The blading used nominally the same blade sections as the datum, and parametric studies were conducted into various lean/sweep configurations to try to optimise the blade performance. The final blade geometry also incorporated leading edge recambering towards the fixed endwalls of both the rotor and stator. The '3D' blading demonstrated a 1.5% increase in efficiency (over the datum blading) at design flow rising to around 3% at near stall along with an improvement in stall margin and pressure rise characteristic. The design work was completed using the TRANSCode flow solver for both the blade-to-blade solutions (used in the SI-S2 datum design calculation) and the fully 3D solutions (for the advanced design and post datum design appraisal). The 3D solutions gave a reasonable representation of the mid-span and main 3D flow features but failed to model the corner and tip clearance flow accurately. An interesting feature of the low speed flowfield was the circumferential variation in total pressure observed at exit from all rotors for both designs. This was not present at high speed and represents one of the main differences between the high and low speed flow. Unsteady modelling of mid- height sections from the first stage indicate that part of this variation is due to the potential interaction of the rotor with the downstream stator while the remainder is due to the wake structure from the upstream stator convecting through the rotor passage. Finally, the implications for a high speed design based on the success of the 3D low speed design are considered.
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Wang, Wei-Hui. "Modelling machine induced noise and vibration in a ship structure." Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/2823.

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Most high speed vessels are fitted with powerful high speed engines which are installed in confined spacesa nd, as a consequencec, ausea n extremely high level of noise and vibration. Often structure-borne sound power is transmitted to a sound carrying structure from a source via a number of contact points. In turn, the noise and vibration are propagated in the structure and could possibly cause an undesired noise radiation. In this study, a model for predicting power flow based on the mobility theory has been addressed. The unique parts of the study include the establishment of the relationship of mobility functions with respect to four-pole parameters and the dynamic stiffness coefficients of a coupled machine/mount/foundation system. Also expressions to represent the sound input power, the output power and the transmitted power in relation to mobility functions are clarified. From a detailed analysis of relevant literature, it is shown that no validated models for predicting the propagation of structure-bome noise within the intermediate frequency range of 125 Hz to lkHz exist. As a consequence, a new numerical stress wave model has been developed to bridge this knowledge gap. This innovative approach extends the earlier works of Cremer, Heckl and Ungar in the field of stress wave propagation. Finally, a novel holistic model has been developed to line up the transmission, propagation and radiation predictions of a machine induced noise and vibration in ship's structure to take in account the fluid-structure interaction effect. A number of experiment measurements have been performed to validate the established models. From the comparisons, the prediction models are shown to be credible with an accuracy higher than 95 per cent. The established models are of a generic nature and can be applicable to diverse engineering fields regarding to the predictions of structure-borne noise and vibration transmission, propagation and radiation. Applications of these models to characterize the vibration reduction countermeasures,a s in the case of resilient mounts and squeeze-film damping plates, from a machine are also discussed.
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Tsekenis, Stylianos-Alexios. "High speed chemical species tomography for advanced fuels and engines." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/high-speed-chemical-species-tomography-for-advanced-fuels-and-engines(2ea2e7eb-c3e7-4fe9-96c1-a01d7e4c4a04).html.

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Current research in CI combustion aims to reduce PM and NOx emissions by controlling mixture homogeneity. Low CN fuels are suitable due to their auto-ignition resistance, but the in-cylinder mixture stratification level must be carefully visualised and controlled. Numerous diagnostic techniques exist for imaging the in-cylinder hydrocarbon species concentration. Tomographic techniques based on spectroscopic modalities are minimally-intrusive and able to target species of interest even in multi-component fuel blends. The high-speed CST technique applied in this work is based on the NIRAT modality. A number of collimated LASER beams at 1700nm traverse the optically accessible engine combustion chamber and are spectroscopically absorbed by the first overtone of the C-H stretch bond. Non species-specific attenuation mechanisms are suppressed by a DWR scheme utilising a reference wavelength at 1651nm. Ratiometric data is used to tomographically reconstruct the spatially-varying fuel concentration. In this work the first application of NIRAT on a commercial CI engine is presented, using instrumentation capable of imaging 13 frames/CAD at 1200rpm using a 31-beam array. A novel method was developed to experimentally quantify the tomography system’s non-uniform spatial resolution. The method was applied in laboratory experiments involving free-space propane plumes and a map of the spatial resolution was created. The spatial resolution varies between 4mm and 14mm. The mean of 9mm is 72% better than previous estimates in the literature. Regions of poor performance correlated with non-uniformities in the sensitivity matrix, indicating that a regular beam array may contribute towards more accurate and objective reconstructions of unknown concentrations. The characterised tomography system was installed on an optically-accessible Volvo D5 CI engine. The optically-inaccessible CAD region achieved was ±18CAD, a reduction of ±12° from previous works. The vibration-tolerance of the optical access system was verified, concluding that the initial alignment of the beams is the dominant factor that determines beam integrity after prolonged engine operation. The behavior of individual beams was studied, finding strong cycle-to-cycle correlation of the anomalies present. This was exploited to develop a novel, robust analysis algorithm to process the engine data. The algorithm achieved a standard deviation of <10% of the maximum pk-pk magnitude of the transmission signal in the fuel vapour phase. The system was applied to qualitatively visualise the mixing of a 50/50% blend of iso-/n-dodecane in a motored, nitrogen-aspirated engine under a range of operating conditions. A study by simulation of the decomposition of n-dodecane concluded that only 0.492% of the quantity injected is pyrolytically converted during a compression stroke. Spray-phase imaging was not possible due to severe reduction of the optical throughput, lasting for 8-15 CAD for a lean mixture and for 15-30 CAD for a rich mixture. Vapour-phase reconstructions using the enhanced iterative Landweber algorithm were successful in resolving rich fuel pockets consistent with the injection pattern. It was shown that the degree of mixture homogeneity at TDC is dependent upon the initial intake temperature. PLIF was used to cross-validate the NIRAT reconstructions. Localisation of the features reconstructed with NIRAT was excellent, with a maximum angular deviation of ±10°. A swirl motion of the mixture by 1°/CAD was observed using both techniques, confirming the features previously observed in the NIRAT reconstructions. In conclusion, NIRAT has been, for the first time, successfully applied for in-cylinder fuel distribution imaging in a CI engine. The results, created using an original data analysis algorithm, were successfully cross-validated using PLIF. A novel spatial resolution quantification method was formulated and used to characterise the tomography system. The numerous findings and learning points from the individual stages of this work will be used to advance the field of combustion diagnostics as well as contribute towards the development of advanced in-cylinder tomographic imaging systems.
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Pullen, Keith R. "The design and development of a small gas turbine and high speed generator." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/11414.

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Swanson, William J. "Determination of diesel engine cylinder gas torques from speed fluctuations with a high-fidelity crankshaft torsional model." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA359161.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer) Naval Postgraduate School, December 1998.<br>"December 1998." Thesis advisor(s): Knox T. Millsaps, Jr. Includes bibliographical references (p. 105-107). Also available online.
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Ebaid, Munzer Shehadeh Yousef. "Design and construction of a small gas turbine to drive a permanent magnet high speed generator." Thesis, University of Hertfordshire, 2002. http://hdl.handle.net/2299/14046.

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Radial gas turbines engines have established prominence in the field of small turbomachinery because of their simplicity, relatively high performance and installation features. Thus they have been used in a variety of applications such as generator sets, small auxiliary power units (APu), air conditioning of aircraft cabins and hybrid electric vehicles turbines. The current research describes the design, manufacturing, construction and testing a radial type small gas turbine. The aim was to design and build the engine to drive directly a high-speed permanent magnet alternator running at 60000 rpmand developing a maximum of 60 W. This direct coupling arrangement produces a portable, light, compact, reliable and environment friendly power generator. These features make the generator set very attractive to use in many applications including emergency power generation for hospitals, in areas of natural disasters such as floods and earthquakes, in remote areas that cannot be served from the national grid, oil rigs, and in confined places of limited spaces. It is important to recognize that the design of the main components, that is, the inward flow radial UFR turbines, the centrifugal compressor and the combustion chamber involve consideration of aero-dynamics, thermodynamics, fluid mechanics, stress analysis, vibration analysis, selection of bearings, selection of suitable materials and the requirements for manufacturing. These considerations are all inter-linked and a procedure has been followed to reach an optimum design. This research was divided into three phases: phase I dealt with the complete design of the inward radial turbine, the centrifugal compressor, the power transmission shaft, the selection of combustion chamber and the bearing housing including the selection of bearings. Phase 2 dealt with mechanical consideration of the rotating components that is stress, thermal and vibration analyses of the turbine rotor, the impeller and the rotating shaft, respectively. Also it dealt with the selection of a suitable fuel and oil lubrication systems and a suitable starting system. Phase 3 dealt with the manufacturing of the gas turbine components, balancing the rotating components, assembling the engine and finally commissioning and then testing the engine. The current work in this thesis has put the light on a new design methodology on determining the optimum principal dimensions of the rotor and the impeller. This method, also, has defined the optimum number of blades and the axial length of the rotor and the impeller. Mathematical models linking the performance parameters and the design variables for the turbine and the compressor have been developed to assist in carrying out parametric studies to study the influence of the design parameters on the performance and on each other. Also, a new graphical matching procedure has been developed for the gas turbine components. This technique can serve as a valuable tool to determine the operating range and the engine running line. Furthermore, it would decide whether the gas turbine engine operates in a region of satisfactory compressor and turbine efficiencies.
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El-Hasan, Tareq Sadeq Fawzi. "Design of a permanent magnet axial flux high-speed generator." Thesis, University of Hertfordshire, 2002. http://hdl.handle.net/2299/14045.

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Electrical generating sets powered by gas turbines are required for many applications, in particular for emergency situations due to their critical attributes; high reliability, lightweight, small size, multi-fuel capabilities, low maintenance, low noise and low gas emissions. This research contends that a permanent magnet axial flux (PMAF) high-speed generator with a small gas turbine engine offers advantages over the radial flux permanent magnet generators. Higher power densities can be achieved with the axial flux configuration when compared to their counter parts of the radial flux machines of similar output power. The attributes of the PMAF machines were certainly appealing; lightweight, small size, high efficiency and ease of construction. In this research, a design approach for the PMAF high-speed generator which accounts for the mechanical and electrical aspects was provided. The machine's key components such as retainment ring was carefully designed and the materials utilised in their structures were appropriately selected to insure high mechanical integrity, ease of construction and low manufacturing cost. The generator's principle dimensions were determined from a theoretical model which was derived from the machine's main design parameters. This theoretical model was then correlated by some empirical coefficients determined through the manipulation of the experimentally validated finite element (FE) results. The analytical results have shown that with the appropriate design considerations, PMAF high-speed generators can be designed with high power densities in the range of 6-8 kW/kg and high efficiencies ideally in the range of 94 - 96 %. The mechanical integrity and the steady state electrical performance of the machine were analysed using three-dimensional (3D) FE models. More in this research, a parametric study was carried out on the most influential parameters of the machine to improve its electrical performance through minimise rotor and stator eddy current losses. In addition, the total harmonic distortion in the output waveform was minimised through the appropriate and careful design of the magnet shape and topology with the aid of 3D electromagnetic FE analysis. Furthermore, using FE it was possible to design, optimise and analyse the rotor back-iron disc through the selection of best material, shape and size for use in the PMAF high-speed generator. A prototype of the PMAF high-speed generator was constructed and tested preliminary at low speed for the purpose of the evaluation of the electrical performance of the machine. Experimental results have shown that the machine was capable to meet the design requirements. For the mechanical integrity of the machine, the rotors were safely tested on a cold run test rig at the speed of 47,000 rpm. This thesis describes also the trends and the technical details in the manufacturing, construction and experimental setup for the PMAF high-speed generator.
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Ramírez, Hernández José Gustavo. "Combustion studies for high speed direct injection diesel engines under low temperature cold start conditions." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/16690.

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Road transportation sector faces nowadays the challenge of satisfying the growing demands for mobility and at the same time to reduce its negative impact on environment. The panorama for the future is to reduce to zero the tank-to-wheel emissions levels with electric vehicles. Nevertheless, the extended use and massive production of this kind of vehicles is compromised due to different factors. On the one hand, the technology has to keep evolving in order to improve its reliability and to reduce acquisition costs. And on the other hand, cities, legislations and users have to get ready in order to make an appropriate use of these vehicles. What will happen in short and medium term is the transition from current vehicles, powered by internal combustion engines, to 100% electric cars. For this transition, diesel engines will continue having an extended use, or even more, due to their capacity of accomplishing with emissions legislations with low fuel consumption. To be competitive, diesel engine technology has to continue improving in order to satisfying markets requirements being respectful with environment. Cold start is one of the most problematic combustion phases for diesel engines. During this phase, a large proportion of pollutants are produced within the cylinder due to misfiring and incomplete combustion due to the low engine temperatures. Furthermore, exhaust after-treatment devices work inefficiently since their minimum operation temperatures cannot be reached. In addition to this, at temperatures below 0ºC the possibility of continuous misfiring could actually impede the engine start. This is the combustion phase on which this study has been focused. Different authors have made efforts to give directions in pro of cold start combustion optimization. But these studies are scarce and it is missed a fundamental understanding of how diesel combustion is under this conditions. Knowing this, the planned objective for this thesis is to contribute to the understa<br>Ramírez Hernández, JG. (2012). Combustion studies for high speed direct injection diesel engines under low temperature cold start conditions [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/16690<br>Palancia
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Regan, Nicholas J. "The characterisation of liquid sprays injected from circular and non-circular nozzles into high speed subsonic cross-airstreams." Thesis, University of Sussex, 2012. http://sro.sussex.ac.uk/id/eprint/38645/.

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This study was motivated by a need to better understand the sprays that can develop when oil leaks occur in gas turbine engines. Current gas turbine engines incorporate an extensive network of oil distribution pipes which deliver lubrication oil to bearings and seals at various locations across the engine. Parts of the oil pipe network are situated in hot, high pressure engine cavities where an oil leak, from a fractured pipe or leaking seal, could ignite and lead to an engine fire. Oil leaks in gas turbine engines create liquid injection in cross-airstream situations, a subject which has been widely studied for combustion systems. However, previous studies are almost exclusively based on circular nozzle geometries. For a fractured oil pipe, the geometry through which the oil leaks approximates to a slot shape rather than a circular nozzle. Sprays which develop in cross-airstreams are most sensitive to the parameters of Weber number (Weg eq) and momentum flux ratio (q). A wide range for these parameters are considered to be possible in engine oil leak scenarios because of the variety of crack dimensions possible and range of airflow conditions across the different sections of the engine; from zero to in excess of We g eq = 4000 and q = 300 could be possible in extreme cases. The aim of this study was to generate and then characterise sprays in representative conditions. The main focus was the characterisation of the droplets which formed in the sprays, with the key objective of providing validation data for CFD codes. Droplet characterisation was performed using a phase Doppler particle analysis system. High speed video as well as pulsed laser sheet digital imaging were also used in the study to provide insight into upstream features of the spray field. A 0.5 x 5.38 mm slot shaped nozzle geometry was used in two orientations; perpendicular alignment ↓↓⦶ and parallel alignment ↓↓⦶ . Water was injected into a cross-airstream over a twelve point test matrix with momentum flux ratios (q) values within the range of 4 ≳ q ≳ 32 and Weber number (We g eq) values within the range of 300 ≳ We g eq ≳ 1600. The position of the spray was highly dependent on slot nozzle orientation. The spray was considerably further offset from the nozzle injection wall in parallel alignment ↓↓⦶ , compared to the perpendicular alignment ↓↓⦶. However, the centre-line distribution of Arithmetic Mean Diameter (AMD) was similar for both orientations, albeit offset further from the injection wall for the parallel slot nozzle. The underlying structure of droplet size distribution was consistent with results for sprays from circular nozzles. At low liquid injection pressures the sprays produced by the perpendicular aligned slot ↓↓⦶ exhibited impingement, producing large droplets in the near wall region. Where impingement was not present, the data showed that AMD was not significantly influenced by the orientation of the slot nozzle; with all tests generating results in the range of 16 μm ≳ AMD ≳ 80 μm.
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Nouhov, Dimitar. "Investigation of the effect of inlet valve timing on the gas exchange process in high-speed engines." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/7682.

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The motivation for this investigation is the potential for the application of Variable Valve Actuation (VVA) technology in high-speed and high power to volume density, four stroke, spark ignition, internal combustion engines. The benefits of this technology have already been proven in medium-speed automotive engines. In the beginning of this thesis the differences between high-speed and medium-speed engines are outlined and a case is presented why this investigation is required. During the preliminary study VVA technology was reviewed and classification was created based on system functionality. Valvetrain and camdrive dynamic considerations were used to identify VVA technologies, which will allow high-speed operation. The main aspect of this investigation focuses on the effect of individual valve events on the gas exchange process of a high-speed engine. If the optimum valve events in terms of engine output for different engine speedsc an be defined, this will allow assessmenot f the potential of selected VVA systems. To accomplish this, a parametric study exploring the sensitivity of charging efficiency to variation of the individual inlet valve events was performed. Results for five different Inlet Valve Opening (IVO) and Inlet Valve Closing (IVC) points are presented. The study employed engine simulation, which was fully validated experimentally. The use of simulation allows not only the study of the effects of valve events on engine performance but also allows explanation of the results by examining the cylinder filling mechanisms and the gas dynamic processes in the inlet and exhaust system. A control strategy was created for each of the selected VVA systems so that it best satisfies the optimum valve events. An assessment and comparison of their potential for improving engine perfonnance was possible.
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Books on the topic "High speed engines"

1

Hartley, T. T. A hierarchy for modeling high speed propulsion systems. National Aeronautics and Space Administration, 1991.

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Kunkulagunta, K. R. Spray, combustion and emission studies in high speed DI diesel engines. UMIST, 1995.

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Rieckhoff, T. J. High-speed observer: Automated streak detection for the aerospike engine. National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 2001.

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Swanson, William J. Determination of diesel engine cylinder gas torques from speed fluctuations with a high-fidelity crankshaft torsional model. Naval Postgraduate School, 1998.

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Szuch, John R. Enhancing aeropropulsion research with high-speed interactive computing. National Aeronautics and Space Administration, Lewis Research Center, 1991.

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Timnat, Y. M. Advanced airbreathing propulsion. Krieger Pub. Co., 1996.

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Shaw, Robert J. Engine technology challenges for a 21st century high speed civil transport. National Aeronautics and Space Administration, 1991.

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Hanson, Donald B. Unified aeroacoustics analysis for high speed turboprop aerodynamics and noise. Volume 1 - Development of theory for blade loading, wakes and noise. Lewis Research Center, 1991.

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Awdry, Christopher. Gordon the high-speed engine. William Heinemann Ltd., 1995.

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Awdry, Christopher. Gordon the high-speed engine. Heinemann, 1993.

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Book chapters on the topic "High speed engines"

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Corrigan, D. J., E. Pascolini, D. Zecchetti, and F. Titus. "Ignition System Development for High Speed High Load Lean Boosted Engines." In Ignition Systems for Gasoline Engines. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45504-4_13.

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Kawahara, Nobuyuki. "Visualization of Combustion Processes of Internal Combustion Engines." In The Micro-World Observed by Ultra High-Speed Cameras. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61491-5_12.

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Jackson, N. S. "The High Speed Direct Injection Diesel Engine — Future Potential." In Thermo- and Fluid-dynamic Processes in Diesel Engines. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04925-9_1.

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Calabretta, Michele, Alessandro Sitta, Salvatore Massimo Oliveri, and Gaetano Sequenzia. "Simulation of Dynamic Stresses on High Performance Engine Valve Spring System Considering Coil Clashing Effect." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_18.

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AbstractThe valve train plays a major role in the performance of internal combustion engines by controlling the combustion process and it is therefore one of the key aspects for increasing the efficiency of combustion engines. Considering the dynamics, the spring force must be high enough to reliably close the valve preventing from seating bouncing due to surge modes after the valve closure. On the other side, the spring force should be kept as low as possible in order to reduce the engine friction losses and consequently the fuel consumption. In the high-performance engines, the valve springs have to be designed and optimized for sustaining higher stresses with compact dimensions leading to critical material and manufacturing processes. This requires a reduction of moving masses and a strong focus on design and process optimization of the coil springs for reducing the mechanical load and the friction losses at low engine speed. At the same time, valve train should be reliable at high engine speed. The calculation of stresses and contact forces for moving parts under dynamic load is essential for durability analysis. A method to calculate the contact of moving masses is described and proposed to justify valve motions experimental results. To fully understand the failure mechanism of test bed reliability trials, the dynamic stresses have been calculated modeling the real springs’ shape. The contact forces have been reproduced considering the coil clash effects and the dynamic behavior of the flexible spring.
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Gisiger, Michael, and Tobias Gwehenberger. "New ABB turbocharger series for large high-speed diesel engines." In Proceedings. Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-19012-5_11.

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Figer, Günter, Kurt Schmidleitner, Thomas Kammerdiener, and Mathias Schönbacher. "Next generation high-speed engines paving the road for the highest engine efficiency." In Proceedings. Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-25889-4_3.

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Pasternak, Michal, Corinna Netzer, Fabian Mauss, Michael Fischer, Marc Sens, and Michael Riess. "Simulation of the Effects of Spark Timing and External EGR on Gasoline Combustion Under Knock-Limited Operation at High Speed and Load." In Knocking in Gasoline Engines. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-69760-4_8.

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Armbruster, Wolfgang, Justin S. Hardi, and Michael Oschwald. "Experimental Investigation of Injection-Coupled High-Frequency Combustion Instabilities." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_16.

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Abstract Self-excited high-frequency combustion instabilities were investigated in a 42-injector cryogenic rocket combustor under representative conditions. In previous research it was found that the instabilities are connected to acoustic resonance of the shear-coaxial injectors. In order to gain a better understanding of the flame dynamics during instabilities, an optical access window was realised in the research combustor. This allowed 2D visualisation of supercritical flame response to acoustics under conditions similar to those found in European launcher engines. Through the window, high-speed imaging of the flame was conducted. Dynamic Mode Decomposition was applied to analyse the flame dynamics at specific frequencies, and was able to isolate the flame response to injector or combustion chamber acoustic modes. The flame response at the eigenfrequencies of the oxygen injectors showed symmetric and longitudinal wave-like structures on the dense oxygen core. With the gained understanding of the BKD coupling mechanism it was possible to derive LOX injector geometry changes in order to reduce the risks of injection-coupled instabilities for future cryogenic rocket engines.
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Braun, Christian, Alexander Rieß, Peter Böhm, Hauke Lund, and Klaus Eder. "The new MAN 175D high‑speed engine – synthesis of commercial and medium‑speed engine development." In Heavy-Duty-, On- und Off-Highway-Motoren 2017. Springer Fachmedien Wiesbaden, 2018. http://dx.doi.org/10.1007/978-3-658-21029-8_9.

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Holmes, R. "On Bearing Deformation and Temperature Distribution in Dynamically-Loaded Engine Bearings." In Vibration and Wear in High Speed Rotating Machinery. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_22.

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Conference papers on the topic "High speed engines"

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Sugiyama, Nanahisa. "Generalized High Speed Simulation of Gas Turbine Engines." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-270.

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This paper describes a real-time or faster-than-real-time simulation of gas turbine engines, using an ultra high speed, multi-processor digital computer, designated the AD100. It is shown that the frame time is reduced significantly without any loss of fidelity of a simulation. The simulation program is aimed at a high degree of flexibility to allow changes in engine configuration. This makes it possible to simulate various types of gas turbine engines, including jet engines, gas turbines for vehicles and power plants, in real-time. Some simulation results for an intercooled-reheat type industrial gas turbine are shown.
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Haas, A., U. Geiger, and F. Maaben. "Oil Aeration in High Speed Combustion Engines." In International Congress & Exposition. SAE International, 1994. http://dx.doi.org/10.4271/940792.

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Riggins, D. "Optimization for maximum performance high-speed engines." In Space Plane and Hypersonic Systems and Technology Conference. American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-4518.

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BODOC, Virginel, and Pierre Berthoumieu. "Experimental Investigation of High Speed SLD Impact." In International Conference on Icing of Aircraft, Engines, and Structures. SAE International, 2019. http://dx.doi.org/10.4271/2019-01-2006.

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Ferrarese, Andre, Robert Richard Banfield, and Eduardo Tomanik. "High Value PVD Top Ring for High Speed Diesel Engines." In SAE World Congress & Exhibition. SAE International, 2008. http://dx.doi.org/10.4271/2008-01-0793.

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Schulte, Horst, Manfred Dürnholz, and Helmut Endres. "Development Potential of High Speed DI Diesel Engines." In 1988 Conference and Exposition on Future Transportation Technology. SAE International, 1988. http://dx.doi.org/10.4271/881208.

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Lopez-Diez, Alfredo, Luis Ruiz-Calavera, Javier Castillo-Calvo, and Raul Prieto-Ibañez. "Front End Optimization of High Speed Turboprop Engines." In 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-4204.

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Franke, Michael, Klaus Lierz, Peter Heuser, Jose Geiger, Bartosch Jagodzinski, and Udo Schlemmer-Kelling. "Development Strategies for Gas Engines in High- and Medium-Speed Applications." In ASME 2014 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icef2014-5564.

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Natural gas as a fuel for high and medium speed engines in industrial, power generation and marine propulsion applications is used for various reasons. Apart from the operating costs which are essentially determined by the fuel price, legislation is an important factor governing the use and the conception of the engines. The engine requirements are influenced by regulatory standards. Engine exhaust emission limits will continue to be stringent, including greenhouse relevant emissions such as CO2 and CH4. Additionally, a corresponding infrastructure is needed to guarantee the availability of the gas for the extensive implementation and use of gas engines. In the past, gas engine products were typically developed from production diesel engines. Today, gas engine development strategies are tailored to the intended use of these engines. Requirements concerning performance and emissions, fuel quality and fuel availability, transient response, etc. define the general technical specifications of the gas engine. These requirements provide the basis for the selection of the appropriate combustion concepts. Open chamber, prechamber with and without gas scavenging, and dual fuel concepts represent a broad variety of combustion concepts. Each of the mentioned systems entails individual characteristics and limitations and requires specific layouts of the engine design and fuel supply. This paper provides an overview of various gas engine concepts and development tools for high- and medium-speed gas engines.
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Werlberger, Peter. "High Speed Combustion Photography With Endoscopes In Actual Diesel Engines A New Approach." In 16th International Congress on High Speed Photography and Photonics, edited by Michel L. Andre and Manfred Hugenschmidt. SPIE, 1985. http://dx.doi.org/10.1117/12.967932.

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Ferraro, Carlo V., Mario Marzano, and Patrizio Nuccio. "Knock-Limit Measurement in High-Speed S. l. Engines." In SAE International Congress and Exposition. SAE International, 1985. http://dx.doi.org/10.4271/850127.

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Reports on the topic "High speed engines"

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Kakwani, R. M., R. E. Winsor, Ryan, III, T. W., J. A. Schwalb, S. Wahiduzzaman, and Wilson, Jr., R. P. Coal-fueled high-speed diesel engine development. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5200525.

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Dougal, Roger A., Blanca Correa, Yucheng Zhang, et al. High Speed Turbo-Generator: Test Stand Simulator Including Turbine Engine Emulator. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada542940.

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Nakashima, Tatsushi, Takehiko Kato, Kiyokazu Akiyama, and Keisuke Komori. Development of Combustion Characteristics Analysis Method of Ultra-High Engine Speed Range. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0513.

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Kakwani, R. M., Wilson, Jr., R. P., and R. E. Winsor. Coal-fueled high-speed diesel engine development: Task 2, Market assessment and economic analysis. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5169114.

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Kang, Sae Byul, Young Jong Chung, Eun Hyun Lee, and Gum Jung Yoon. Development of a Diesel Engine Cylinder Head With High Combustion Pressure by Using High-Speed Head Fatigue Tester. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0162.

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Kakwani, R. M., R. E. Winsor, T. W. III Ryan, J. A. Schwalb, S. Wahiduzzaman, and R. P. Jr Wilson. Coal-fueled high-speed diesel engine development. Final report, September 28, 1990--November 30, 1993. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10123643.

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Yu, Shaeng-Tao J., Chang-Kee Kim, and Zeng-Chan Zhang. Simulation of High-Speed Cavity Flows in a Scramjet Engine by the Space-Time CESE Method. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada439707.

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DeHart, Jonathan, Robert Russell, John Storey, et al. Performance and Durability Assessment of Two Emission Control Technologies Installed on a Legacy High-Speed Marine Diesel Engine. Defense Technical Information Center, 2015. http://dx.doi.org/10.21236/ada627476.

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Bahman Habibzadeh. Very High Fuel Economy, Heavy Duty, Constant Speed, Truck Engine Optimized Via Unique Energy Recovery Turbines and Facilitated High Efficiency Continuously Variable Drivetrain. Office of Scientific and Technical Information (OSTI), 2010. http://dx.doi.org/10.2172/992845.

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Develop the dual fuel conversion system for high output, medium speed diesel engines. Final report. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/291025.

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