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Relevant bibliographies by topics / Stratified charge engines Models

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Academic literature on the topic 'Stratified charge engines Models'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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Journal articles on the topic "Stratified charge engines Models"

1

Han, Z., Z. Xu, and N. Trigui. "Spray/wall interaction models for multidimensional engine simulation." International Journal of Engine Research 1, no. 1 (2000): 127–46. http://dx.doi.org/10.1243/1468087001545308.

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Models were developed to describe the spray wall impingement processes that take place in internal combustion engines. In this report focus is placed on the model formulation and experiment assessment of the spray/wall interaction submodels. It is identified that the Leidenfrost phenomenon is very unlikely to occur in a spark ignition (SI) engine including stratified-charge operation in a direct injection spark ignition (DISI) engine. A more comprehensive splashing/deposition threshold function is proposed to include the effects of surface roughness and pre-existing liquid film. Based on the wave phenomena observed on the surface of the liquid crown formed during drop impingement, a new splash breakup model is developed using linear instability analysis. The predicted drop size agrees well with available single-drop impingement experimental data. A new formulation for the post-impingement droplet velocity is also given which uses statistical sampling and jet impingement theory. The proposed models were assessed by comparing computations with two sets of experimental sprays impinging on a flat plate with the use of a pintle nozzle injector for port fuel injection (PFI) engines. The computed spray shape, normal and tangential penetration and droplet size show good agreement with experimental data.

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Xu, Bo Yan, De Zhi Sun, Yun Liang Qi, Yong Wei Zheng, Hai Ying Tian, and Shao Li Cai. "Study on Mixture Formation of Liquid LPG for a Center Injection DISI Engine." Advanced Materials Research 201-203 (February 2011): 622–26. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.622.

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Center injection in pentroof combustion chamber can reduce wall wetting and unburned hydrocarbon emission in wall guided combustion system, which is generally employed in DISI (Direct Injection Spark Ignition) engines. Once liquid phase LPG (Liquefied Petroleum Gas) is injected at a high pressure, flash boiling occurs severely, promotes mixing and reduces wall wetting in wall guided engine. Based on validating the feasibility of the models, this paper numerically simulates the mixing process of a center injection wall guided DISI engine in different conditions. The results show that a stratified charge can obtained at part load with late injection, whereas at high load the early injection can achieve a homogeneous mixture at the end of compression stroke.

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Smith, Jamie Karl, Phil Roberts, Alexandros Kountouriotis, David Richardson, Pavlos Aleiferis, and Daniel Ruprecht. "Thermodynamic modelling of a stratified charge spark ignition engine." International Journal of Engine Research 21, no. 5 (2018): 801–10. http://dx.doi.org/10.1177/1468087418784845.

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Combustion of a charge with spatially and temporally varying equivalence ratio in a spark ignition engine was modelled using the Leeds University Spark Ignition Engine quasi-dimensional thermodynamic code. New sub-models have been integrated into Leeds University Spark Ignition Engine that simulate the effect of burnt gas expansion and turbulent mixing on an initial equivalence ratio distribution. Realistic distribution functions were used to model the radially varying equivalence ratio. The new stratified fuel model was validated against experimental data, showing reasonable agreement for both the pressure trace and percentage heat released. Including the effect of turbulent mixing was found to be important to reproduce the trend in the differences between the stratified and homogeneous simulations.

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Cho, K.-W., D. Assanis, Z. Filipi, G. Szekely, P. Najt, and R. Rask. "Experimental investigation of combustion and heat transfer in a direct-injection spark ignition engine via instantaneous combustion chamber surface temperature measurements." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 222, no. 11 (2008): 2219–33. http://dx.doi.org/10.1243/09544070jauto853.

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An experimental study was performed to provide the combustion and in-cylinder heat transfer characteristics resulting from different injection strategies in a direct-injection spark ignition (DISI) engine. Fast-response thermocouples were embedded in the piston top and cylinder head surface to measure the instantaneous combustion chamber surface temperature and heat flux, thus providing critical information about the combustion characteristics and a thorough understanding of the heat transfer process. Two distinctive operating modes, homogeneous and stratified, were considered and their effect on combustion and heat transfer in a DISI engine was investigated. The stratified operating mode yielded significantly higher spatial variations of heat flux than the homogeneous mode. This behaviour is directly caused by the main features of stratified combustion, i.e. vigorous burning of a close-to-stoichiometric mixture near the spark, and a cool, extremely lean mixture at the periphery. The cooling effect of the spray impinging on the piston surface when the fuel is injected late in compression could be detected too. The local phenomena change with varying speed and injection parameters. Comparison between the calculated global heat fluxes and measured local heat fluxes were performed in order to assess the behaviour of classic heat transfer models. Comparisons between the global and local heat fluxes provide additional insight into spatial variations, as well as indications about the suitability of different classic models for investigations of the heat transfer aspect of DISI engines. Special consideration is required when applying classic heat transfer correlations to stratified DISI operation as heat flux values are lower by more than 30 per cent when compared with homogeneous operation of the same engine at the same load.

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Cao, Li, Hua Zhao, Xi Jiang, and Navin Kalian. "Understanding the infiuence of valve timings on controlled autoignition combustion in a four-stroke port fuel injection engine." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 219, no. 6 (2005): 807–23. http://dx.doi.org/10.1243/095440705x11077.

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Controlled autoignition (CAI) combustion, also known as homogeneous charge compression ignition (HCCI), was achieved through the negative valve overlap approach by using small- lift camshafts. Three-dimensional multicycle engine simulations were carried out in order better to understand the effects of variable intake valve timings on the gas exchange process, mixing quality, CAI combustion, and pollutant formation in a four-stroke port fuel injection (PFI) gasoline engine. Full engine cycle simulation, including complete gas exchange and combustion processes, was carried out over several cycles in order to obtain the stable cycle for analysis. The combustion models used in the present study are a modified shell ignition model and a laminar and turbulent characteristic time model, which can take high residual gas fraction into account. After the validation of the model against experimental data, investigations of the effects of variable intake valve timing strategies on the CAI combustion process were carried out. These analyses show that the intake valve opening (IVO) and intake valve closing (IVC) timings have a strong infiuence on the gas exchange and mixing processes in the cylinder, which in turn affect the engine performance and emissions. Symmetric IVO timing relative to exhaust valve closing (EVC) timing tends to produce a more stratified mixture, earlier ignition timing, and localized combustion, and hence higher NO x and lower unburned HC and CO emissions, whereas retarded IVO leads to faster mixing, a more homogeneous mixture, and uniform temperature distribution.

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Li, Tie, Keiya Nishida, Yuyin Zhang, Tuyoshi Onoe, and Hiroyuki Hiroyasu. "Enhancement of Stratified Charge for DISI Engines through Split Injection : Effect and Its Mechanism(S.I. Engines, Stratified-Charge Combustion)." Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines 2004.6 (2004): 521–28. http://dx.doi.org/10.1299/jmsesdm.2004.6.521.

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Dinc, Cenk, Hikmet Arslan, and Rafig Mehdiyev. "CO2Emission Reduction Using Stratified Charge in Spark-Ignition Engines†." Energy & Fuels 23, no. 4 (2009): 1781–85. http://dx.doi.org/10.1021/ef800349x.

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Li, Yufeng, Hua Zhao, Ben Leach, and Tom Ma. "Charge Stratification in a Strong Tumble SI Engine(S.I. Engines, Stratified-Charge Combustion)." Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines 2004.6 (2004): 505–12. http://dx.doi.org/10.1299/jmsesdm.2004.6.505.

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Giorgetti, N., G. Ripaccioli, A. Bemporad, I. V. Kolmanovsky, and D. Hrovat. "Hybrid Model Predictive Control of Direct Injection Stratified Charge Engines." IEEE/ASME Transactions on Mechatronics 11, no. 5 (2006): 499–506. http://dx.doi.org/10.1109/tmech.2006.882979.

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Duclos, J. M., T. Baritaud, and A. Fusco. "Modeling Turbulent Combustion and Pollutant Formation in Stratified Charge Si Engines." Revue de l'Institut Français du Pétrole 52, no. 5 (1997): 541–52. http://dx.doi.org/10.2516/ogst:1997059.

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Dissertations / Theses on the topic "Stratified charge engines Models"

1

Janes, Nigel Charles. "Simplified modeling of stratified-charge combustion in a constant volume chamber /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486402957194833.

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Bhave, Amit. "Stochastic reactor models for homogeneous charge compression ignition engines." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616153.

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Platts, Kieron Charles. "Investigation into the feasibility of a four valve per cylinder lean burn port fuel injected stratified charge combustion system." Thesis, Birmingham City University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367469.

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Su, Haiyun. "Stochastic reactor models for simulating direct injection homogeneous charge compression ignition engines." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608887.

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Halim, Anton, and 林中安. "Dynamic Modelling of a Turbocharged GDI Engine in Homogeneous and Stratified Charge Modes." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/a9hm3g.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>106<br>In order to improve gasoline engine efficiency, different strategies were devel- oped. One of the strategy is to utilize the direct injection system, which allows the engine to run in stratified charge operation at low load and speed. Stratified charge operation allows an overall lean combustion. This method together with boosted intake pressure from turbocharger are expected to improve gasoline en- gine efficiency considerably. To reach the optimum performance of a GDI engine, a dynamic model that can simulate real engine behaviour is needed. The model developed in this paper considers the mode switching behaviour between homo- geneous and stratified charge. It is also examined whether the compressor work in a stable working area or not. The mean value model is constucted based on first principles and parametric models analysis for different parts of the engine such as: throttle, intake manifold, engine cylinders and exhaust manifold. Mass flow and efficiency for both compressor and turbine are parameterized function of turbocharger shaft speed and pressure ratio at inlet and outlet. The power delivered into the turbocharger shaft and outlet temperature are calculated by thermodynamics equations. The results of the simulation are validated both in steady state and during transient in the homogeneous and stratified combustion modes.

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Aroonsrisopon, Tanet. "Analysis of stratified charge operation and negative valve overlap operation using direct fuel injection in homogeneous charge compression ignition engines." 2006. http://www.library.wisc.edu/databases/connect/dissertations.html.

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Books on the topic "Stratified charge engines Models"

1

Badgley, P. Stratified charge rotary aircraft engine technology enablement program: Final report. The Division, 1985.

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2

Nguyen, Hung Lee. Performance and combustion characteristics of direct-injection stratified-charge rotary engines. National Aeronautics and Space Administration, 1987.

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Nguyen, Hung Lee. Performance and combustion characteristics of direct-injection stratified-charge rotary engines. National Aeronautics and Space Administration, 1987.

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Lee, Chi M. Regressed relations for forced convection heat transfer in a direct injection stratified charge rotary engine. National Aeronautics and Space Administration, 1988.

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United States. National Aeronautics and Space Administration., ed. Numerical study of stratified charge combustion in wave rotors. National Aeronautics and Space Administration, 1997.

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A, Willis Edward, and United States. National Aeronautics and Space Administration., eds. Performance of a supercharged direct-injection stratified-charge rotary combustion engine. NASA, 1990.

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J, McFadden John, and United States. National Aeronautics and Space Administration., eds. NASA's Rotary Engine Technology Enablement Program, 1983 through-1991. National Aeronautics and Space Administration, 1992.

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J, Mack, Mount R, and United States. National Aeronautics and Space Administration., eds. Two rotor stratified charge rotary engine (SCRE) engine system technology evaluation. National Aeronautics and Space Administration, 1994.

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J, Schock Harold, and United States. National Aeronautics and Space Administration., eds. Regressed relations for forced convection heat transfer in a direct injection stratified charge rotary engine. National Aeronautics and Space Administration, 1988.

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F, Hamady, Somerton C, and United States. National Aeronautics and Space Administration., eds. Stratified charge rotary engine combustion studies: Progress report. National Aeronautics and Space Administration, 1989.

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Book chapters on the topic "Stratified charge engines Models"

1

Weaving, J. H. "Stratified Charge Engines." In Internal Combustion Engineering: Science & Technology. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0749-2_5.

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Kubota, Tomoaki, Nobuhiro Shinmura, and Ken Naitoh. "Cycle-Resolved Computations of Stratified-Charge Turbulent Combustion in Direct Injection Engines." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33750-5_8.

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Miyagawa, Hiroshi, Yoshihiro Nomura, and Makoto Koike. "Numerical Simulation of Combustion Processes in Homogeneous and Stratified Charge Spark Ignition Engines." In Smart Control of Turbulent Combustion. Springer Japan, 2001. http://dx.doi.org/10.1007/978-4-431-66985-2_7.

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4

Bartolucci, L., E. C. Chan, S. Cordiner, R. L. Evans, and V. Mulone. "The Ultra-Lean Partially Stratified Charge Approach to Reducing Emissions in Natural Gas Spark-Ignited Engines." In Energy, Environment, and Sustainability. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3307-1_3.

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Spicher, U., and T. Heidenreich. "Stratified-charge combustion in direct injection gasoline engines." In Advanced Direct Injection Combustion Engine Technologies and Development. Elsevier, 2010. http://dx.doi.org/10.1533/9781845697327.20.

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6

Sendyka, Bronisaw, and Mariusz Cygnar. "Stratified Charge Combustion in a Spark-Ignition Engine With Direct Injection System." In Advances in Internal Combustion Engines and Fuel Technologies. InTech, 2013. http://dx.doi.org/10.5772/53971.

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Vishnu, S. B., and Biju T. Kuzhiveli. "Effect of Roughness Elements on the Evolution of Thermal Stratification in a Cryogenic Propellant Tank." In Low-Temperature Technologies [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98404.

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The cryogenic propulsion era started with the use of liquid rockets. These rocket engines use propellants in liquid form with reasonably high density, allowing reduced tank size with a high mass ratio. Cryogenic engines are designed for liquid fuels that have to be held in liquid form at cryogenic temperature and gas at normal temperatures. Since propellants are stored at their boiling temperature or subcooled condition, minimal heat infiltration itself causes thermal stratification and self-pressurization. Due to stratification, the state of propellant inside the tank varies, and it is essential to keep the propellant properties in a predefined state for restarting the cryogenic engine after the coast phase. The propellant’s condition at the inlet of the propellant feed system or turbo pump must fall within a narrow range. If the inlet temperature is above the cavitation value, cavitation will likely to happen to result in the probable destruction of the flight vehicle. The present work aims to find an effective method to reduce the stratification phenomenon in a cryogenic storage tank. From previous studies, it is observed that the shape of the inner wall surface of the storage tank plays an essential role in the development of the stratified layer. A CFD model is established to predict the rate of self-pressurization in a liquid hydrogen container. The Volume of Fluid (VOF) method is used to predict the liquid–vapor interface movement, and the Lee phase change model is adopted for evaporation and condensation calculations. A detailed study has been conducted on a cylindrical storage tank with an iso grid and rib structure. The development of the stratified layer in the presence of iso grid and ribs are entirely different. The buoyancy-driven free convection flow over iso grid structure result in velocity and temperature profile that differs significantly from a smooth wall case. The thermal boundary layer was always more significant for iso grid type obstruction, and these obstructions induces streamline deflection and recirculation zones, which enhances heat transfer to bulk liquid. A larger self-pressurization rate is observed for tanks with an iso grid structure. The presence of ribs results in the reduction of upward buoyancy flow near the tank surface, whereas streamline deflection and recirculation zones were also perceptible. As the number of ribs increases, it nullifies the effect of the formation of recirculation zones. Finally, a maximum reduction of 32.89% in the self-pressurization rate is achieved with the incorporation of the rib structure in the tank wall.

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Conference papers on the topic "Stratified charge engines Models"

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Bemporad, Alberto, Nicolo` Giorgetti, Ilya Kolmanovsky, and Davor Hrovat. "Hybrid Modeling and Control of a Direct Injection Stratified Charge Engine." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32102.

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This paper illustrates the application of hybrid modeling and optimal control to the problem of air-to-fuel ratio and torque control in advanced technology gasoline direct injection stratified charge (DISC) engines. DISC engines have two discrete modes of operation, stratified and homogeneous, and their dynamic behavior can be easily captured by a hybrid model. We show that the design flow (hybrid modeling and controller synthesis) is simple in terms of problem setup and tuning, provides good closed-loop performance, and leads to a control law that can be implemented on automotive hardware as a piecewise affine function of the measured and estimated quantities.

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Silvestri, William B., and Edward S. Wright. "John Deere Score™ Engines in Marine Applications." In ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-256.

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The paper gives a basic description of the stratified charge combustion process in the Stratified Charge Omnivorous Rotary Engine - SCORE. The inherent advantages of the Wankel geometry combined with spark ignition of a stratified mixture for a unique combustion cycle are explained with diagrams. The discussion points out why the engine is neither octane or cetane sensitive, making it a truly multifuel (omnivorous) intermittent combustion engine. A brief description of the parts and their function help to explain the inherent compactness of the engine and confirm its simplicity and efficiency. The engine specific size, weight, air flow and fuel flow are compared to an equivalent output turbine engine to place the performance in a familiar context. A most impressive feature of the engine, attractive cost of production, is demonstrated by the modular nature of its design. This feature is amplified by an in-depth description of the “Family of Engines” concept, highlighting the large number of common parts in a family of one to six rotor models. The ability to cover a complete market segment with one geometry is attractive for production costs, service, training and logistics. Modular design also enhances application flexibility. Development programs are underway for a diversity of applications for families of SCORE engines. Each application utilizes the unique characteristics available with this engine and is further justified by the economies realized in volume production. Thus low volume, high power applications (1000kW and up) can realize savings by utilizing the same major parts tooled for higher volume use in smaller engines. Some potential applications are discussed with particular emphasis on marine installations. Specific comparisons with other powerplants for shipboard electrical generation are presented.

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Andreassi, Luca, Stefano Cordiner, Vincenzo Mulone, C. Reynolds, and R. L. Evans. "Numerical-Experimental Comparison of the Performance of a Partially Stratified Charge Natural Gas Fuelled Engine." In ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/icef2004-0912.

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Compressed natural gas (CNG) has great potential as an alternative fuel for vehicle engines, and can reduce emissions and improve fuel economy. A single cylinder research engine has been modified to enable direct injection of a small quantity of fuel near the spark plug, independently of an overall lean homogeneous charge. Thus a partially stratified charge is formed within the chamber, which allows significant extension of the lean limit of combustion. This results in an improvement in specific fuel consumption. Numerical simulation also plays an important role in the development of such technological solutions. 3D simulations, in particular, are desirable to provide complete information about thermal and fluid dynamical fields within the chamber. In particular, among the developed numerical tools linked to the KIVA-3V code, special attention was dedicated to the formulation of the combustion model (CFM) turbulent combustion model based on the flamelet hypothesis), to adequately model non-homogeneities and lean mixture compositions. In this paper an optimization procedure is assessed, with the ultimate goal of designing combustion chambers properly devoted to be operated under lean (homogeneous and PSC) mixture conditions. The results related to the procedure definition and to its experimental validation are presented. Experimental and numerical data have been compared in terms of pressure cycles and heat release rate profiles. The overall results are encouraging, taking into special account the difficulty to reliably predict the key performance parameters without any “tuning interventions”, even when mixture richness and homogeneity were varied.

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Zanforlin, S., E. Musu, S. Frigo, and R. Gentili. "Direct Injection and Charge Stratification in a 50 cc Two-Stroke Engine: CFD Studies and Test Bench Results." In ASME 2006 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/icef2006-1545.

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Direct fuel injection has become necessary in two-stroke S.I. engines, since it prevents one of the major problems of these engines, that is fuel loss from the exhaust port. Another important problem is combustion irregularity at light loads, due to excessive residual gas in the charge, and can be solved by charge stratification. High-pressure liquid fuel injection is able to control the mixing process inside the cylinder for getting either stratified charge at partial loads or quasi-stoichiometric conditions, as it is required at full load. The feasibility of this solution for a small engine for light motorcycles has been studied using CFD tools. An exhaustive investigation carried out by the KIVA3v code allowed to design a 50 cm3 engine prototype with a satisfactory behaviour even at light loads in unthrottled condition, as proved by good fuel economy and engine stability in dynamometric bench tests. Exhaust gas analysis and indicated pressure behaviour confirm stratification and combustion correctness. For the final part of the research the adoption of the AVL-Fire code has been considered: the possibility to take into account any combustion chamber and transfer duct geometric details and the accuracy of spray breakup and wall film models allow to better understand the engine behaviour throughout the operating range, obtaining useful information in order to efficiently shorten the experimental time required for the EU map-setting.

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Grover, Ronald O., Junseok Chang, Edward R. Masters, Paul Najt, and Aditya Singh. "The Effect of Intake Valve Deactivation on Lean Stratified Charge Combustion at an Idling Condition of a Spark-Ignition Direct-Injection (SIDI) Engine." In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60171.

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A combined experimental and analytical study was carried out to understand the improvement in combustion performance of a 4-valve SIDI wall-guided engine operating at lean, stratified idle with enhanced in-cylinder charge motion by deactivating one of the two intake valves. A fully warmed-up engine was operated at low speed, light load by injecting the fuel from a pressure-swirl injector during the compression stroke to produce a stratified fuel cloud surrounding the spark plug at the time of ignition. Steady state flow-bench measurements and CFD calculations showed that valve deactivation primarily increased the in-cylinder swirl intensity as compared with opening both intake valves. Engine dynamometer measurements showed an increase in charge motion led to improved combustion stability, increased combustion efficiency, lower fuel consumption, and higher dilution tolerance. A CFD study was conducted using in-house models of spray and combustion to simulate the engine operating with and without valve deactivation. The computations demonstrated that the improved combustion was primarily driven by higher laminar flame speeds through enhanced mixing of internal residual gases, better containment of the fuel cloud within the piston bowl, and higher post-flame diffusion burn rates during the initial, main, and late stages of the combustion process, respectively.

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Cavina, Nicolo`, Fabrizio Ponti, Carlo Siviero, and Rosanna Suglia. "Residual Gas Fraction Estimation for Model-Based Variable Valve Timing and Spark Advance Control." In ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/icef2004-0956.

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As it is well known, the combustion process in Spark Ignition (SI) engines is strongly affected by the quality and quantity of the fluid within the cylinder at Intake Valve Closing (IVC). Residual gas affects the engine combustion processes (and therefore emissions and performance) through its influence on charge mass, temperature and dilution. Moreover, in Gasoline Direct Injection (GDI) engines, the amount of oxygen in the residual gas may be significant if the engine is operated in stratified charge mode (low loads and speeds), while almost no oxygen may be found in the residual gas during homogeneous-charge operation. In this paper, different approaches to residual gas fraction estimation are analyzed and compared. The main objective is to obtain a simple and reliable model also in presence of Variable Valve Timing (VVT, both on intake and exhaust valves) and External Gas Recirculation (EGR) systems, that could be used to control combustion duration and position. In fact, the two main contributions to residual gas fraction (backflow of the burned gas during the valve overlap period, and amount of gas trapped within the cylinder) are strongly affected by intake and exhaust valves timing, and EGR flow should be taken into account in order to determine the total exhaust gas mass within the cylinder at IVC. Therefore, estimation of residual gas mass and composition is crucial for designing VVT and EGR management strategies, integrated with optimal control of Spark Advance (and therefore of the combustion process). Experimental data have been acquired on a 3.2 liter V6 GDI engine, equipped with intake and exhaust VVT systems. Tests were performed throughout the engine operating range for different combinations of intake and exhaust valve timings, while varying EGR flow.

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Mount, Robert E., and Gaston Guaroa. "Stratified Charge Rotary Engines for Aircraft." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-311.

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Substantial progress has been made over the past two years in the technological status and production aspects of Stratified Charge Rotary Engines, a new propulsion technology for aircraft of the 1990’s. A 400 HP aircraft engine, designed in cooperation with Avco-Lycoming (during late 1986) is currently undergoing testing at John Deere’s Rotary Engine Division. Current status and design features are reported in this paper and related to overall research and technology enablement efforts toward several families of advanced liquid cooled, turbocharged and intercooled engines over a wide power range for commercial general aviation. Capabilities for high altitude, long endurance, military unmanned aircraft missions are examined. Application to fixed and rotary wing aircraft are planned.

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Gentili, R., E. Musu, and S. Zanforlin. "Stratified Charge Strategies in Direct Injection S.I. Engines." In 7th International Conference on Engines for Automobile. SAE International, 2005. http://dx.doi.org/10.4271/2005-24-071.

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Dimpelfeld, Philip, and Albert Humke. "Heat Release Characteristics of Stratified - Charge Rotary Engines." In SAE International Congress and Exposition. SAE International, 1987. http://dx.doi.org/10.4271/870443.

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Zanforlin, S., and R. Gentili. "Stable Fuel Confinement in Stratified Charge GDI Engines." In ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/icef2004-0919.

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Direct fuel injection combined with charge stratification represents a must for two-stroke S.I. engines, since it prevents fuel loss from the exhaust port and incomplete combustion or misfire at light loads. The most difficult aims are keeping stable stratification when engine operating conditions change and, at very light loads, avoiding excessive dilution and spreading of fuel vapour in consequence of burned gas expansion. Two new-concept engine designs are proposed in this paper. In both cases shapes of piston and head, together with scavenging-duct orientation have been optimised to obtain stable in-cylinder flow field features (independently of engine speed) and proper fuel distribution at ignition time. Computational Fluid Dynamics (CFD) predictions at different loads and speeds are reported and discussed.

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Reports on the topic "Stratified charge engines Models"

1

Dahms, Rainer. Combustion Instability in Spray-Guided Stratified-Charge Engines ? A Review. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1172799.

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2

Fedewa, Andrew, Tom Stuecken, Edward Timm, et al. Active flow control for maximizing performance of spark ignited stratified charge engines. Final report. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/809083.

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3

Shudo, Toshio. Cooling Loss Reduction and Thermal Efficiency Improvement by Direct Injection Stratified Charge in Hydrogen Combustion Engines. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0276.

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