Bibliografías temáticas / Surge tank design, Surge analysis

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Literatura académica sobre el tema "Surge tank design, Surge analysis"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Surge tank design, Surge analysis"

Barkan, Christopher P. L., Todd T. Treichel y Gary W. Widell. "Reducing Hazardous Materials Releases from Railroad Tank Car Safety Vents". Transportation Research Record: Journal of the Transportation Research Board 1707, n.º 1 (enero de 2000): 27–34. http://dx.doi.org/10.3141/1707-04.

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The leading cause of hazardous materials releases in railroad transportation over the 5 years prior to this research was burst frangible disks on tank cars. These burst disks occur as a result of pressure surges in the tank car safety vent during transportation. More than a dozen different surge pressure reduction devices (SPRDs) have been developed to protect the frangible disk from these surges. A statistical analysis of tank cars in service indicated that cars equipped with SPRDs experienced a lower rate of leakage due to burst frangible disks than similar cars without SPRDs. This analysis, however, did not provide sufficient resolution to determine the relative effectiveness of the different SPRD designs. A series of controlled experiments was conducted to determine the surge reduction effectiveness and the flow performance of different SPRDs. These tests showed that there were significant differences in the performance of the various surge pressure reduction devices in both surge reduction and flow rate. The results of these tests will help tank car builders, owners, and operators improve the safety performance of tank cars by installing SPRDs that will reduce non-accident-caused releases of hazardous materials and still function adequately to relieve pressure when necessary. The results also will provide a basis for setting SPRD performance and testing requirements and identify promising design elements for new SPRDs.

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Seyfeddine, Mona, Samuel Vorlet, Nicolas Adam y Giovanni De Cesare. "Holistic Design Approach of a Throttled Surge Tank: The Case of Refurbishment of Gondo High-Head Power Plant in Switzerland". Water 12, n.º 12 (8 de diciembre de 2020): 3440. http://dx.doi.org/10.3390/w12123440.

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In order to increase the installed capacity, the refurbishment of Gondo high-head power plant required a modification of the existing surge tank by installing a throttle at its entrance. In a previous study, the geometry of this throttle was optimized by physical modeling to achieve the target loss coefficients as identified by a transient 1D numerical analysis. This study complements previous analyses by means of 3D numerical modeling using the commercial software ANSYS-CFX 19 R1. Results show that: (i) a 3D computational fluid dynamics (CFD) model predicts sufficiently accurate local head loss coefficients that agree closely with the findings of the physical model; (ii) in contrast to a standard surge tank, the presence of an internal gallery in the surge tank proved to be of insignificant effect on a surge tank equipped with a throttle, as the variations in the section of the tank cause negligible local losses compared to the ones induced by the throttle; (iii) CFD investigations of transient flow regimes revealed that the head loss coefficient of the throttle only varies for flow ratios below 20% of the total flow in the system, without significantly affecting the conclusions of the 1D transient analysis with respect to minimum and maximum water level in the surge tank as well as pressure peaks below the surge tank. This study highlights the importance of examining the characteristics of a hydraulic system from a holistic approach involving hybrid modeling (1D, 3D numerical and physical) backed by calibration as well as validation with in-situ measurements. This results in a more rapid and economic design of throttled surge tanks that makes full use of the advantages associated with each modeling strategy.

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Bhattarai, Khem Prasad, Jianxu Zhou, Sunit Palikhe, Kamal Prasad Pandey y Naresh Suwal. "Numerical Modeling and Hydraulic Optimization of a Surge Tank Using Particle Swarm Optimization". Water 11, n.º 4 (6 de abril de 2019): 715. http://dx.doi.org/10.3390/w11040715.

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In a pressurized water conveyance system, such as a hydropower system, during hydraulic transients, maximum and minimum pressures at various controlling sections are of prime concern for designing a safe and efficient surge tank. Similarly, quick damping of surge waves is also very helpful for the sound functioning of the hydro-mechanical system. Several parameters like diameter of the surge tank, diameter of the orifice, operating discharge, working head, etc., influence the maximum/minimum surge, damping of surge waves in the surge tank, and the difference of maximum pressure head at the bottom tunnel and maximum water level in the surge tank. These transient behaviors are highly conflicting in nature, especially for different diameters of orifices (DO) and diameters of surge tanks (DS). Hence, a proper optimization method is necessary to investigate the best values of DO and DS to enhance the safety and efficiency of the surge tank. In this paper, these variables are accurately determined through numerical analysis of the system by the Method of Characteristics (MOC). Furthermore, the influence on the transient behavior with changing DO and DS is investigated and finally, optimum values of DO and DS are determined using Particle Swarm Optimization (PSO) to minimize the effects of hydraulic transients on the system without compromising the stability and efficiency of the surge tank. The obtained results show significant improvements over the contemporary methods of finding DO and DS for surge tank design.

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Sarasúa, José Ignacio, Paz Elías, Guillermo Martínez-Lucas, Juan Ignacio Pérez-Díaz, José Román Wilhelmi y José Ángel Sánchez. "Stability Analysis of a Run-of-River Diversion Hydropower Plant with Surge Tank and Spillway in the Head Pond". Scientific World Journal 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/874060.

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Run-of-river hydropower plants usually lack significant storage capacity; therefore, the more adequate control strategy would consist of keeping a constant water level at the intake pond in order to harness the maximum amount of energy from the river flow or to reduce the surface flooded in the head pond. In this paper, a standard PI control system of a run-of-river diversion hydropower plant with surge tank and a spillway in the head pond that evacuates part of the river flow plant is studied. A stability analysis based on the Routh-Hurwitz criterion is carried out and a practical criterion for tuning the gains of the PI controller is proposed. Conclusions about the head pond and surge tank areas are drawn from the stability analysis. Finally, this criterion is applied to a real hydropower plant in design state; the importance of considering the spillway dimensions and turbine characteristic curves for adequate tuning of the controller gains is highlighted.

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Liang, Ji, Xiaohui Yuan, Yanbin Yuan, Zhihuan Chen y Yuanzheng Li. "Nonlinear dynamic analysis and robust controller design for Francis hydraulic turbine regulating system with a straight-tube surge tank". Mechanical Systems and Signal Processing 85 (febrero de 2017): 927–46. http://dx.doi.org/10.1016/j.ymssp.2016.09.026.

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Seck, Aboudou y Musandji Fuamba. "Contribution to the Analytical Equation Resolution Using Charts for Analysis and Design of Cylindrical and Conical Open Surge Tanks". Journal of Water Resource and Protection 07, n.º 15 (2015): 1242–56. http://dx.doi.org/10.4236/jwarp.2015.715101.

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Moses, G. A., G. L. Kulcinski, D. Bruggink, R. Engelstad, E. Lovell, J. Macfarlane, Z. Musicki et al. "LIBRA–A light ion beam inertial confinement fusion reactor conceptual design". Laser and Particle Beams 7, n.º 4 (noviembre de 1989): 721–31. http://dx.doi.org/10.1017/s0263034600006194.

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The LIBRA light ion beam fusion commerical reactor study is a self-consistent conceptual design of a 330 MWe power plant with an accompanying economic analysis. Fusion targets are imploded by 4 MJ shaped pulses of 30 MeV Li ions at a rate of 3 Hz. The target gain is 80, leading to a yield of 320 MJ. The high intensity part of the ion pulse is delivered by 16 diodes through 16 separate z-pinch plasma channels formed in lOO torr of helium with trace amounts of lithium. The blanket is an array of porous flexible silicon carbide tubes with Li17Pb83 flowing downward through them. These tubes (INPORT units) shield the target chamber wall from both neutron damage and the shock overpressure of the target explosion. The target chamber is a right circular cylinder, 8·7 meters in diameter. The target chamber is ‘self-pumped’ by the target explosion generated overpressure into a surge tank partially filled with liquid that surrounds the target chamber. This scheme refreshes the chamber at the desired 3 Hz frequency without excessive pumping demands. The blanket multiplication is 1·2 and the tritium breeding ratio is 1·4. The direct capital cost of LIBRA is estimated to be $2200/kWe.

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Richter, Wolfgang, Helmut Knoblauch y Gerald Zenz. "Surge Tank Design for Storage-Tunnels". WASSERWIRTSCHAFT 109, S1 (septiembre de 2019): 72–76. http://dx.doi.org/10.1007/s35147-019-0239-8.

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Dhakal, Resham, Jianxu Zhou, Sunit Palikhe y Khem Prasad Bhattarai. "Hydraulic Optimization of Double Chamber Surge Tank Using NSGA-II". Water 12, n.º 2 (8 de febrero de 2020): 455. http://dx.doi.org/10.3390/w12020455.

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A surge tank effectively reduces water hammer but experiences water level oscillations during transient processes. A double chamber surge tank is used in high head plants with appreciable variations in reservoir water levels to limit the maximum amplitudes of oscillation by increasing the volume of the surge tank near the extremes of oscillation. Thus, the volume of the chambers and the design of an orifice are the most important factors for controlling the water level oscillations in a double chamber surge tank. Further, maximum/minimum water level in the surge tank and damping of surge waves have conflicting behaviors. Hence, a robust optimization method is required to find the optimum volume of chambers and the diameter of the orifice of the double chamber surge tank. In this paper, the maximum upsurge, the maximum downsurge, and the damping of surge waves are considered as the objective functions for optimization. The worst condition of upsurge and downsurge is determined through 1-D numerical simulation of the hydropower system by using method of characteristics (MOC). Moreover, the sensitivity of dimensions of a double chamber surge tank is studied to find their impact on objective functions; finally, the optimum dimensions of the double chamber surge tank are found using non-dominated sorting genetic algorithm II (NSGA-II) to control the water level oscillations in the surge tank under transient processes. The volume of the optimized double chamber surge tank is only 44.53% of the total volume of the simple surge tank, and it serves as an effective limiter of maximum amplitudes of oscillations. This study substantiates how an optimized double chamber surge tank can be used in high head plants with appreciable variations in reservoir water levels.

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Wan, Wuyi, Boran Zhang, Xiaoyi Chen y Jijian Lian. "Water Hammer Control Analysis of an Intelligent Surge Tank with Spring Self-Adaptive Auxiliary Control System". Energies 12, n.º 13 (1 de julio de 2019): 2527. http://dx.doi.org/10.3390/en12132527.

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The water hammer can cause great risks in water supply pipe systems. A surge tank is a kind of general water hammer control device. In order to improve the behavior of the surge tank, a self-adaptive auxiliary control (SAC) system was proposed in this paper. The system can optimize the response of the surge tank according to the transient pressure. The numerical model and the matched boundary conditions were established to simulate the improved surge tank and optimize the SAC system. Then, various transient responses were simulated by the proposed model with different parameters set. The proposed system is validated by comparing the water hammer process in a river-pipe-valve (RLV) system with and without SAC. The results show that the SAC can greatly improve the water hammer control of the pipeline and the water level oscillation of the surge tank. With the SAC system, the required vertical size of the surge tank can be significantly reduced with the desired water hammer control function.

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Más fuentes

Tesis sobre el tema "Surge tank design, Surge analysis"

Berberoglu, Pinar. "Numerical Investigation Of Effective Surge Tank Dimensions In Hydropower Plants Under Various Hydraulic Conditions". Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615558/index.pdf.

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In water conveyance systems, sudden changes in the flow velocity cause a phenomenon called waterhammer associated with high pressure head changes. Unless a control device is used as a precaution, waterhammer may result in costly damages and even in some cases, loss of human lives. In light of this concept, different control devices that can protect the systems against waterhammer are introduced so that the great pressure differences are absorbed and the system is maintained undamaged. In this thesis, the main functions, the requirements for its construction and the different types of the surge tanks are explained. The governing differential equations defining the flow conditions of the surge tanks and their solutions are provided. In addition, for the use of design engineers a procedure to determine proper dimensions of a surge tank is developed. For the sake of dimensioning the surge tank effectively, empirical equations, which calculate the height of three different types of surge tanks with dimensionless parameters, are obtained. With the help of regression analysis, the correlation between the parameters of the developed equations are determined, and found to be relatively high. Finally, the economical aspect of a surge tank is discussed and comparison parameters are introduced to the designer.

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Ozdemir, Sahika. "Design Considerations And Performance Evaluation Of A Surge Tank For Diaphragm Pump Operation". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612662/index.pdf.

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This thesis is performed to evaluate the design consideration and performance characteristics of a surge tank for a diaphragm pump operation and to evaluate the proper volume and inlet area of surge tank in order to reduce the pulsations of the discharge pressure. An experimental set up is constructed for a three diaphragm positive displacement pump and the experiments are conducted afterwards. The surge tanks having different volumes and the surge tank inlet area configurations are tested in order to achieve the minimum peak to peak pulsations. Experiments showed that among the different sizes of the surge tanks, the minimum peak to peak pulsations are achieved with the largest volume which is the original surge tank of the test pump used by the pump manufacturer. This result is supported by the literature which states that with greater surge tank size the magnitude of pulsations can be diminished more. Regarding the surge tank inlet area design
among the eight different adaptors a proper inlet area value is concluded having the minimum peak to peak pulsations also smaller than the original configuration.

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"Gap Analysis towards A Design Qualification Standard Development for Grid-Connected Photovoltaic Inverters". Master's thesis, 2011. http://hdl.handle.net/2286/R.I.9390.

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abstract: The high penetration of photovoltaic (PV) both at the utility and at the distribu-tion levels, has raised concerns about the reliability of grid-tied inverters of PV power systems. Inverters are generally considered as the weak link in PV power systems. The lack of a dedicated qualification/reliability standard for PV inverters is a main barrier in realizing higher level of confidence in reliability. Development of a well-accepted design qualification standard specifically for PV inverters will help pave the way for significant improvement in reliability and performance of inverters across the entire industry. The existing standards for PV inverters such as UL 1741 and IEC 62109-1 primarily focus on safety. IEC 62093 discusses inverter qualification but it includes all the balance of sys-tem components and therefore not specific to PV inverters. There are other general stan-dards for distributed generators including the IEEE1547 series of standards which cover major concerns like utility integration but they are not dedicated to PV inverters and are not written from a design qualification point of view. In this thesis, some of the potential requirements for a design qualification standard for PV inverters are addressed. The IEC 62093 is considered as a guideline and the possible inclusions in the framework for a dedicated design qualification standard of PV inverter are discussed. The missing links in existing PV inverter related standards are identified by performing gap analysis. Dif-ferent requirements of small residential inverters compared to large utility-scale systems, and the emerging requirements on grid support features are also considered. Electric stress test is found to be the key missing link and one of the electric stress tests, the surge withstand test is studied in detail. The use of the existing standards for surge withstand test of residential scale PV inverters is investigated and a method to suitably adopt these standards is proposed. The proposed method is studied analytically and verified using simulation. A design criterion for choosing the switch ratings of the inverter that can per-form reliably under the surge environment is derived.
Dissertation/Thesis
M.S. Electrical Engineering 2011

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Capítulos de libros sobre el tema "Surge tank design, Surge analysis"

Kumar, Jitendra. "Design and Analysis of Nonlinear PID Controller for Complex Surge Tank System". En Proceedings of International Conference on Communication and Artificial Intelligence, 189–99. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6546-9_20.

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Calabretta, Michele, Alessandro Sitta, Salvatore Massimo Oliveri y Gaetano Sequenzia. "Simulation of Dynamic Stresses on High Performance Engine Valve Spring System Considering Coil Clashing Effect". En Lecture Notes in Mechanical Engineering, 108–13. Cham: 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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"Economic design of a surge tank: An alternative approach". En Emerging Trends in Engineering, Science and Technology for Society, Energy and Environment, 141–46. CRC Press, 2018. http://dx.doi.org/10.1201/9781351124140-26.

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Kim, Jong–gyeum y Eun–woong Lee. "Analysis of the steep-fronted surge stress in Induction motor winding using EMTP". En Advanced Computational and Design Techniques in Applied Electromagnetic Systems, 529–32. Elsevier, 1995. http://dx.doi.org/10.1016/b978-0-444-82139-3.50139-7.

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Badler, Norman I., Cary B. Phillips y Bonnie Lynn Webber. "Epilogue". En Simulating Humans. Oxford University Press, 1993. http://dx.doi.org/10.1093/oso/9780195073591.003.0010.

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To define a future for the work described in this book, it is essential to keep in mind the broad goals which motivated the efforts in the first place. Useful and usable software is desired, to be sure, but the vision of manipulating and especially instructing a realistically behaved animated agent is the greater ambition. Some of our visions for the near future are presented, not just for the sake of prognostication, but for its exciting prospects and possibilities. Any discussion of the future of software must take into account the extraordinary pace of developments in the hardware arena. Even conservative predictions of hardware capabilities such as speed and capacity over the five year term lead one perilously close to science fiction. Accordingly, predictions of “better, faster, cheaper, more reliable, more fault tolerant, more highly parallel computers” are easy to make but do little to inform us of the applications these fantastic machines will facilitate. Rather, as general purpose computers improve in all these ways, specialized hardware solutions will decrease in importance and robust, usable software and symbiotic human-computer interfaces will remain the crucial link between a task and a solution. Transforming research into practice is a lengthy process, consisting of a flow of concepts from ideas through algorithms to implementations, from testing and analysis through iterated design, and finally transfer of demonstratably workable concepts to external users and actual applications. This entire process may span years, from the initial description of the concept to a fielded system. The publication of initial results often breeds over-optimism and has been known to lead researchers to allow false expectations to arise in the minds of potential users, with unfortunate results. (Automatic machine translation of text, speech understanding, and early promises of Artificial Intelligence problem solving are good examples of premature speculations.) At the other end of the spectrum, however, are concepts which take a long time to work their way into mainstream technological consciousness. (3D computer graphics is a good example where concepts and even working systems pre-dated widespread commercial availability by more than a decade.) So we will attempt to strike a balance in making speculations: while looking toward a long term research plan we will generally consider technology transfer to occur when serious but sympathetic users can experiment and accomplish real work with it.

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Actas de conferencias sobre el tema "Surge tank design, Surge analysis"

Moghaddam, Mehdi Azhdary. "Analysis, Design and Reliability of a Simple Surge Tank". En Pipeline Division Specialty Congress 2004. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40745(146)19.

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Salas, Carlos Corte´s y He´ctor A. Sa´nchez Sa´nchez. "Seismic and Structural Behaviour of Oil Storage Tank of Large Capacity". En ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67412.

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This research has focused on the behavior, under seismic conditions, of already existing steel storage tanks of large capacity, located in high risk zones. From the revision of analysis and design criteria concerned with thin walls structures, it has been prepared a procedure based on a numeric modeling where the mechanic characteristics of the materials and the real geometrical measures have been considered. Numeric analysis by FEM have been used in different conditions: empty tanks vibration, full tanks where fluid-structure interaction is considered to the case of flexible walls, in order to take into account the pressure distribution of the liquid. To estimate the response, real seismic records originated in the Mexican Region, have been used. Finally the numerical results obtained of the empty tanks with those calculated analytically are compared and it is observed that a good correlation between both approaches. For the results obtained of the fluid-structure interaction models with the selected seismic registry is observed that given its great dimensions and the rigidity that provides the ring to them in the top part of the tanks, the effect of the surge is not very significant due to the fluid system — structure is excited in the first seconds, reason why the action of the hydrostatic pressure on the walls of these is sample to be dominant.

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Clauss, Gu¨nther F., Spyros A. Mavrakos, Florian Sprenger, Daniel Testa y Matthias Dudek. "Hydrodynamic Considerations for FLNG Concepts". En ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50132.

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The current demand in liquefied natural gas (LNG) encouraged the design of various concepts for floating LNG (FLNG) liquefaction or regasification facilities. With increasing transport distance, e.g. from remote marine locations to the onshore gas supply net, gas pipelines become uneconomic compared to shuttle carriers for LNG (LNGC). Due to its high energy density, offshore transfer from processing terminals to carriers and from carriers back to receiving terminals has to be analyzed in detail. During the transfer period, free fluid surfaces occurring in the cargo tanks of the LNGC are leading to a significant decrease of the initial intact stability and altered motion behavior. This paper focusses on the influence of resonant tank sloshing on the LNGC’s roll and surge motions. Analyses of transverse and longitudinal sloshing yield a surprising phenomenon: the frequency shift Δω between the theoretical natural frequency of the tank alone and the respective motion peak for a vessel with four tanks mounted to the hull. Force measurements between tank and hull reveal a peak at the tank’s natural frequency that causes strong liquid motions with related forces and moments on the hull but no increased vessel motions. Additional investigations comprise the offloading situation with a multi-body arrangement of LNGC and a FLNG (the MPLS20 system) in tandem and briefly also in side-by-side configuration. The slow drift motions on the turret-moored FLNG are exemplarily investigated in head seas.

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Bachynski, Erin E., Yin L. Young y Ronald W. Yeung. "Analysis and Dynamic Scaling of Tethered Wave Energy Converters in Irregular Waves". En ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49684.

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Wave energy converters (WECs) are a technically and economically promising option for renewable electricity generation. This paper investigates the hydrodynamic characteristics of a tethered cylindrical wave energy absorber using analytical methods and derives the scaling relations for laboratory testing. The effects of the cylinder geometry, mooring system, and mass distribution on the idealized power takeoff and the pitch motions of a tethered point wave energy absorber in irregular seas are summarized. Analytical solutions for the hydrodynamic coefficients and wave forcing are based on potential flow formulations and eigenfunction expansions. The results show that a relatively light mooring system has little effect on the power takeoff, but introduces a low-frequency coupled pitch-surge resonance that can cause system failure in long period swells. While analytical solutions provide first-order estimates of the system response, laboratory experiments are required to evaluate the nonlinear, coupled system response. In order to design and interpret such experiments, appropriate scaling relationships are determined and validated using numerical simulations. The added mass, radiation damping, wave radiation and diffraction excitation forces, and mooring system mass and stiffness are found to be self-consistent using geometric and Froude number similarity. The effects of incomplete geometric similarity with a shallow wave tank and viscous forces are also discussed.

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Grassi, Ana Giulia F., Rodrigo S. Lavieri, Adriano A. P. Pereira y Eduardo A. Tannuri. "CFD and Experimental Analysis of Current Forces of Pusher-Barge Systems". En ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10404.

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The water transportation of cargo is, among several possible modes of transportation, the most economically and environmentally efficient. Adding technology to pusher-barge systems increases the efficiency of this form of transport. It is not only limited to the design and manufacturing process, but extends to the training of commanders and crews. An efficient way to ensure this training is immersion in virtual scenarios that simulate reality. To have realistic response of the simulator to external commands and boundary conditions, it is necessary to understand the hydrodynamics of the pusher-barge system in its various working conditions. This paper presents results and discussions on the hydrodynamics of a river pusher-barge system based on computational results from CFD (Computational Fluid Dynamics) and experimental results from towing tank test using small scale model. Initially the coefficients of current forces acting on the vessel in the horizontal plane (surge, sway and yaw) obtained by the two methods are presented. Several current incident angles were analyzed in the following cases: two drafts (ballasted and full-loaded), three configurations of barges (1 × 1, 2 × 1 and 2 × 2) and two water depths. Next, the results are compared and the divergences due to small difference in geometry and scale effects are analyzed. The hypotheses formulated for possible causes of the divergences are grounded through mathematical and experimental models and simulations. To cancel these effects and perform validation of CFD, new simulations are presented with similar geometry to the model tested.

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Aftab, Muhammad Saleheen y Muhammad Bilal Kadri. "Design of Fuzzy logic based level controller for surge tank system". En 2013 3rd IEEE International Conference on Computer, Control & Communication (IC4). IEEE, 2013. http://dx.doi.org/10.1109/ic4.2013.6653775.

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"Queensland storm surge forecasting model design using sensitivity analysis". En 21st International Congress on Modelling and Simulation (MODSIM2015). Modelling and Simulation Society of Australia and New Zealand, 2015. http://dx.doi.org/10.36334/modsim.2015.f2.faivre.

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Oakman, Jamie, Mark Gray, Benjamin Leber y Matthew Salac. "Inclined Surge Line Design Considerations for Analysis and Monitoring". En ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93684.

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Abstract Thermal stratification can occur in pressurizer surge lines when flow rates are low and large temperature differences between the pressurizer fluid and reactor coolant loop fluid exist. NRC Bulletin 88-11 requires that utilities address this issue with respect to the licensing basis. Additionally, significant fatigue usage can develop due to insurges and outsurges from the pressurizer that occur when the temperature difference (ΔT) is large. An important aspect of the surge line fatigue analysis is determination of global pipe moment loads due to insurges, outsurges, and related stratification effects. The Westinghouse AP1000® plant surge line is designed to limit the global effects of stratification using a surge line geometry that is inclined more than that of the previous generation plants. However, this design provides unique challenges to the analytical solution in comparison to the mostly horizontal geometries in previous PWR designs. The main challenge is due to the location of the stratified fluid hot/cold interface. The horizontal geometry has historically allowed conservative (based on analytical testing) treatment of the stratified interface profile. The inclined geometry requires consideration of positional changes, as the stratified interface moves through the line due to flow changes. Because of this, iterative calculations were required to predict global piping moment loads through the transient histories based on the movement of the stratified interface. Software was developed to solve a series of correlative equations representing moment loads due to pipe temperatures and stratification ΔT within discretized portions of the surge line throughout each transient. The correlative equations, which are based on the matrix solution of piping analysis load cases, predict the global pipe moment loads to a high degree of precision. The surge line is also a significant location in the online fatigue monitoring program implemented at the sites. The complexity of the design analysis that is reflected in the monitoring model requires a more detailed accounting for the location of the stratification interface, the effect on prediction of moment loadings for controlling locations, and the effect on local stresses at the monitoring locations. This paper describes the approach used to address all of these factors in the design evaluation and subsequent fatigue monitoring application.

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Liang, Huimin, Haidan Yu, Guangcheng Ma, Zhaowen Cai, Yujie Tang y Chunqing Zhao. "Surge load experiment design and results analysis of relay". En 2015 IEEE 61st Holm Conference on Electrical Contacts (Holm). IEEE, 2015. http://dx.doi.org/10.1109/holm.2015.7355082.

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Iga, Yuka, Hayato Nishitanaka y Yoshida Yoshiki. "Numerical Analysis of Influence of Pipe Length on Cavitation Surge". En ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-06066.

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Generally, in boundary condition of numerical simulation of internal flow, flow velocity is fixed in the inlet boundary and static pressure is fixed in the outlet boundary or the inverse condition, which is supposed that upstream and downstream pipes and the uniform flows inside the pipes extend infinitely from the boundaries. Therefore, a numerical simulation of influence of pipe length of fluid machinery cannot be realized by changing a boundary position of the computational region. In the present study, a boundary condition which is taking into account a pipe length is used to numerical simulation of unsteady cavitation in three-blade cyclic cascade, where generalized unsteady Bernoulli equation is adapted to one dimensional region from a upstream tank to the inlet boundary. In the study, cavitation surge frequencies reproduced in the present study are compared with empirical and theoretical characteristics of cavitation surge frequencies. Then, it shows good agreement with empirical frequency of cavitation surge although it does not take into account of the system such as pipe length. On the other hand, the theoretical frequency, which takes into account of the system, predicts a value which is less than half of the present numerical result.

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Informes sobre el tema "Surge tank design, Surge analysis"

Mohanty, Subhasish, Jae Phil Park y Joseph T. Listwan. A System-Level Framework For Fatigue Life Prediction of PWR Pressurizer-Surge-Line Nozzle under Design-Basis Loading Cycles. A complete tensile test based material properties database and preliminary results on 3D weld process modeling, thermal-mechanical stress analysis and environmental fatigue testing. Office of Scientific and Technical Information (OSTI), septiembre de 2019. http://dx.doi.org/10.2172/1571258.

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Berkowitz, Jacob, Nathan Beane, Kevin Philley, Nia Hurst y Jacob Jung. An assessment of long-term, multipurpose ecosystem functions and engineering benefits derived from historical dredged sediment beneficial use projects. Engineer Research and Development Center (U.S.), agosto de 2021. http://dx.doi.org/10.21079/11681/41382.

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The beneficial use of dredged materials improves environmental outcomes while maximizing navigation benefits and minimizing costs, in accordance with the principles of the Engineering With Nature® (EWN) initiative. Yet, few studies document the long-term benefits of innovative dredged material management strategies or conduct comprehensive life-cycle analysis because of a combination of (1) short monitoring time frames and (2) the paucity of constructed projects that have reached ecological maturity. In response, we conducted an ecological functional and engineering benefit assessment of six historic (>40 years old) dredged material–supported habitat improvement projects where initial postconstruction beneficial use monitoring data was available. Conditions at natural reference locations were also documented to facilitate a comparison between natural and engineered landscape features. Results indicate the projects examined provide valuable habitat for a variety of species in addition to yielding a number of engineering (for example, shoreline protection) and other (for example, carbon storage) benefits. Our findings also suggest establishment of ecological success criteria should not overemphasize replicating reference conditions but remain focused on achieving specific ecological functions (that is, habitat and biogeochemical cycling) and engineering benefits (that is, storm surge reduction, navigation channel maintenance) achievable through project design and operational management.

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