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Experimental and Simulative Approaches for the Determination of Discharge Coefficients for Inlet and Exhaust Valves and Ports in Internal Combustion Engines
Technical Paper
2017-01-5022
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to fulfill future exhaust emission regulations, the variety of subsystems of internal combustion engines is progressively investigated and optimized in detail. The present article mainly focuses on studies of the flow field and the resulting discharge coefficients of the intake and exhaust valves and ports. In particular, the valves and ports influence the required work for the gas exchange process, as well as the cylinder charge and consequently highly impact the engine’s performance. For the evaluation of discharge coefficients of a modern combustion engine, a stationary flow test bench has been set up at the Chair of Internal Combustion Engines (LVK) of the Technical University of Munich (TUM). The setup is connected to the test bench’s charge air system, allowing the adjustment and control of the system pressure, as well as the pressure difference across the particular gas exchange valve. Extensive investigations regarding the pressure level, as well as the pressure difference across the valve gap indicate a significant influence of the particular flow conditions on the calculation of these static discharge coefficients.
Moreover, the article presents a more detailed evaluation of the flow field within the valve gap by means of 3D-CFD simulations. One of the most important factors for meaningful simulation results is the meshing strategy. Especially the structure of the computational grid around the valves shows a crucial impact on the numerical stability, as well as the macroscopic simulation results. Therefore, the present article describes the chosen meshing strategy in detail, as well as the critical influences on the convergence of the calculation. Furthermore, since the discharge coefficients are conventionally determined from stationary flow conditions, the article describes an approach for the evaluation of crank angle dependent discharge coefficients, based on a 3D-CFD gas exchange simulation. The results are explicitly discussed regarding the differences between stationary and transient evaluation of the flow field.
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Zirngibl, S., Held, S., Prager, M., and Wachtmeister, G., "Experimental and Simulative Approaches for the Determination of Discharge Coefficients for Inlet and Exhaust Valves and Ports in Internal Combustion Engines," SAE Technical Paper 2017-01-5022, 2017, https://doi.org/10.4271/2017-01-5022.Data Sets - Support Documents
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References
- Kastner L. J. , Williams T. J. und White J. B. Poppet Inlet Valve Characteristics and Their Influence on the Induction Process Proceedings of the Institution of Mechanical Engineers vol. 178 no. 1 955 975 1963
- Woods W. A. und Khan S. R. An Experimental Study of Flow Through Poppet Valves Proc. Instn. Mech. Engrs. Vol. 180 32 41 1965
- Woods W. A. und Khan S. R. Discharge From a Cyclinder Through a Poppet Valve to an Exhaust Pipe Proc. Instn. Mech. Engrs. Vol 182 137 144 1967
- Holmberg , T. , Cronhjort , A. , and Stenlaas , O. Pressure Ratio Influence on Exhaust Valve Flow Coefficients SAE Technical Paper 2017-01-0530 2017 https://doi.org/10.4271/2017-01-0530
- Fukutani , I. and Watanabe , E. Air Flow through Poppet Inlet Valves - Analysis of Static and Dynamic Flow Coefficients SAE Technical Paper 820154 1982 https://doi.org/10.4271/820154
- Deckker , B. and Hung , S. Transient Discharge from a Cylinder at High Rates of Volume Expansion SAE Technical Paper 850082 1985 https://doi.org/10.4271/850082
- Bicen A. F. , Vafidis C. und Whitelaw J. H. Steady and Unsteady Airflow Through the Intake Valve of a Reciprocating Engine J. Fluids Eng 107 ( 3 ) 413 420 1984
- Khalighi , B. , El Tahry , S. , and Kuziak , W. Measured Steady Flow Velocity Distributions Around a Valve/Seat Annulus SAE Technical Paper 860462 1986 https://doi.org/10.4271/860462
- Gault , R. , Thornhill , D. , Fleck , R. , Mackey , D. et al. Analysis of the Steady Flow Characteristics through a Poppet Valve SAE Technical Paper 2004-01-1676 2004 https://doi.org/10.4271/2004-01-1676
- Desantes J. M. , Benajes J. und Urchueguia J. Evaluation of the Non-Steady Flow Produced by Intake Ports of Direct Injection Diesel Engines Experiments in Fluids 19 51 60 1995
- Payri F. , Benajes J. und Reyes M. Modelling of Supercharger Turbines in Internal-Combustion Engines International Journal of Mechanical Sciences Vol. 38 Issue 8-9 853 869 1996
- Danov , S. Identification of Discharge Coefficients for Flow Through Valves and Ports of Internal Combustion Engines SAE Technical Paper 970642 1997 https://doi.org/10.4271/970642
- Blair , G. , Lau , H. , Cartwright , A. , Raghunathan , B. et al. Coefficients of Discharge at the Aperatures of Engines SAE Technical Paper 952138 1995 https://doi.org/10.4271/952138
- Blair , G. and Drouin , F. Relationship Between Discharge Coefficients and Accuracy of Engine Simulation SAE Technical Paper 962527 1996 https://doi.org/10.4271/962527
- Blair , G. , McBurney , D. , McDonald , P. , McKernan , P. et al. Some Fundamental Aspects of the Discharge Coefficients of Cylinder Porting and Ducting Restrictions SAE Technical Paper 980764 1998 https://doi.org/10.4271/980764
- Blair , G. , Callender , E. , and Mackey , D. Maps of Discharge Coefficients for Valves, Ports and Throttles SAE Technical Paper 2001-01-1798 2001 https://doi.org/10.4271/2001-01-1798
- Mattarelli , E. and Valentini , A. On The Flow Modeling Through The Valve Assembly In Engine Cycle Simulations SAE Technical Paper 2000-01-0570 2000 https://doi.org/10.4271/2000-01-0570
- Fang T. und Singh S. Predictions of Flow Separation at the Valve Seat for Steady State Port-Flow Simulation Journal of Engineering for Gas Turbines and Power (Vol. 137 ) 2015
- Bianchi , G. , Cantore , G. , and Fontanesi , S. Turbulence Modelling in CFD Simulation of ICE Intake Flows: The Discharge Coefficient Prediction SAE Technical Paper 2002-01-1118 2002 https://doi.org/10.4271/2002-01-1118
- Caulfield , S. , Rubenstein , B. , Martin , J. , Ruppel , P. et al. A Comparison Between CFD Predictions and Measurements of Inlet Port Discharge Coefficient and Flow Characteristics SAE Technical Paper 1999-01-3339 1999 https://doi.org/10.4271/1999-01-3339
- Miller , R. , Strumolo , G. , Russ , S. , Madin , M. et al. A Comparison of Experimental and Analytical Steady State Intake Port Flow Data Using Digital Physics SAE Technical Paper 1999-01-1183 1999 https://doi.org/10.4271/1999-01-1183
- Ramajo D. E. und Nigro N. M. Numerical and Experimental In-Cylinder Flow Study in a 4-Valve Spark Ignition Engine Mécanica Computacional Vol XXVII 181 205 2008
- Mohammadebrahim A. , Shafiei B. und Kazemzadeh Hannani S. Numerical Simulation of In-Cylinder Tumble Flow Field Measurements and Comparison to Experimental Results The Journal of Engine Research Vol. 26 11 19 2012
- Semlitsch B. , Wang Y. und Mihaescu M. Flow Effects due to Pulsation in an Internal Combustion Engine Exhaust Port Energy Conversion and Management Vol. 86 520 536 2014
- Semlitsch B. , Wang Y. und Mihaescu M. Flow Effects due to Valve and Piston Motion in an Internal Combustion Engine Exhaust Port Energy and Conversion Management Volume 96 18 30 2015
- Heywood J. B. Internal Combustion Engines Fundamentals USA McGraw-Hill 1988
- Tanaka K. Air Flow Through Suction Valve of Conical Seat - Part I. Experimental Research Aeronautical Research Institute, Tokyo Imperial University 1929
- Maier A. , Sheldrake T. H. und Wilcock D. Geometric Parameters Influencing Flow in an Axisymetric IC Engine Inlet Port Assembly: Part I - Valve Flow Characteristics Journal of Fluids Engineering (Vol. 122 ) 650 657 2000
- Weclas M. , Melling A. und Durst F. Flow Separation in the Inlet Valve Gap of Piston Engines Progress in Energy and Combustion Science Vol. 24 165 195 1998
- Mahmood Z. , Chen A. und Yianneskis M. On the Structure of Steady Flow Through Dual-Intake Engine Ports International Journal for Numerical Methods in Fluids (Vol. 23 ) 1085 1109 1996
- Rabbitt , R. Fundamentals of Reciprocating Engine Airflow Part I: Valve Discharge and Combustion Chamber Effects SAE Technical Paper 840337 1984 https://doi.org/10.4271/840337
- Bohac , S. and Landfahrer , K. Effects of Pulsating Flow on Exhaust Port Flow Coefficients SAE Technical Paper 1999-01-0214 1999 https://doi.org/10.4271/1999-01-0214
- Trigui , N. , Kent , J. , Guezennec , Y. , and Choi , W. Characterization of Intake-Generated Flow Fields in I.C. Engines Using 3-D Particle Tracking Velocimetry (3-D PTV) SAE Technical Paper 940279 1994 https://doi.org/10.4271/940279
- Trigui , N. , Affes , H. , and Kent , J. Use of Experimentally Measured In-Cylinder Flow Field Data at IVC as Initial Conditions to CFD Simulations of Compression Stroke in I.C. Engines - A Feasibility Study SAE Technical Paper 940280 1994 https://doi.org/10.4271/940280
- Bauer , W. , Heywood , J. , Avanessian , O. , and Chu , D. Flow Characteristics in Intake Port of Spark Ignition Engine Investigated by CFD and Transient Gas Temperature Measurement SAE Technical Paper 961997 1996 https://doi.org/10.4271/961997
- Fan , L. , Reitz , R. , and Trigui , N. Intake Flow Simulation and Comparison with PTV Measurements SAE Technical Paper 1999-01-0176 1999 https://doi.org/10.4271/1999-01-0176
- Le Coz , J. , Henriot , S. , and Pinchon , P. An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine-Focus on Cycle-Resolved Turbulence SAE Technical Paper 900056 1990 https://doi.org/10.4271/900056
- Han Z. und Reitz R. D. Turbulence Modeling of Internal Combustion Engines Using RNG k-e Models Combust. Sci. and Tech. Vol 106 267 295 1995