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Response of Diesel Combustion Systems to Increase of Fuel Injection Rate
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English
Abstract
Experimental data are presented to show how diesel combustion systems respond to increase of fuel injection rate. Concepts of a fuel spray entrainment parameter, a maximum useful injection rate, and a condition termed ‘impingement’ are introduced to correlate and interpret widely differing responses. Best possible smoke and BSFC values in swirl type direct injection engines are obtained for injection rates 15% to 33% higher than normal values, but in practice lower rates must be used to satisfy emissions and other requirements. Engines with a high swirl rate and impingement give a superior ‘retardability’ for normal injection rates. Computer model calculations also show that there is a maximum useful injection rate and explain the relative fuel economies for different diesel combustion systems.
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Citation
Greeves, G., "Response of Diesel Combustion Systems to Increase of Fuel Injection Rate," SAE Technical Paper 790037, 1979, https://doi.org/10.4271/790037.Also In
References
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