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An Analytical Evaluation of the Effect of Leakage on NO Emissions from a Rotary Engine
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English
Abstract
A mathematical model describing the Wankel engine combustion process is developed to evaluate the effects of apexseal leakage on NO emissions. It is assumed that leakage occurs only during combustion and expansion and that only unburned gas leaks out during combustion and that only unburned gas leaks out during combustion and that during expansion, only burned gas leaks out.
A parametric study is performed to show the effects of such variables as equivalence ratio, compression ratio and engine speed. An experimentally obtained pressure time trace is used to show the accuracy of the model predictions.
It was found that under normal operating conditions (near F = 1), reductions in apex-seal leakage area will not cause an increase in NO emissions and that below 2500 rpm, mass leakage drastically increases with further reductions in speed.
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Citation
McCuiston, F., "An Analytical Evaluation of the Effect of Leakage on NO Emissions from a Rotary Engine," SAE Technical Paper 750023, 1975, https://doi.org/10.4271/750023.Also In
References
- Blumberg D. N. “Nitric Oxide Emissions from Stratified Charge Engines: Prediction and Control.” Combustion Science and Technology 8 1973 5 24
- Shapiro A. H. “The Dynamics and Thermodynamics of Compressible Fluid Flow.” I Ronald Press 1953 109
- Bortner M. H. “Review of Rate Constants of Selected Reactions of Interest in Re-entry Flow Fields in the Atmosphere.” NBS Technical Note 484 1969
- Campbell I. M. Thrush B. A. “Reactivity of Hydrogen to Atomic Nitrogen and Atomic Oxygen.” Faraday Society Transactions 64 1968 1265
- Lavoie G. A. Heywood J. B. Keck J. C. “Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines.” Combustion Science and Technology 1 1970 313 326
- Lavoie G. A. Blumberg P. N. “Measurements of NO Emissions from a Stratified Charge Engine: Comparison of Theory and Experiment.” Combustion Science and Technology 8 1973 25
- Nietschke K. “Report on Rotary Engine KKM 502.” Institute for Engine Construction Report No. 397/4 1966
- Eberle M. K. Klomp E. D. “An Evaluation of the Potential Performance Gain from Leakage Reduction in Rotary Engines.” Paper 730117 SAE Automotive Engineering Congress Detroit January 1973