The lower efficiency of the indirect-injection diesel engine, with respect to the direct injection type, is due to additional heat transfer from the combustion chamber, gas pumping between chambers, later injection timing and a different burning rate schedule.The paper describes a project to isolate and quantify these reasons for low efficiencies, using a mathematical model, supported by experimental verification.The model is based on a two-zone system (main and pre-chamber), with component models for heat transfer, gas flow through the passage etc. Experimentally derived heat release schedules in main and pre-chamber are used.It is shown that for a 0.1 m bore engine, with a Ricardo Comet Vb pre-chamber, the different burning rate schedule is the major contribution to the difference in efficiency, with injection timing and gas pumping being the least significant.
Thermodynamic Efficiency Evaluation of an Indirect Injection Diesel Engine
Sae Technical Papers
1979 Automotive Engineering Congress and Exposition ; 1979
1979-02-01
Conference paper
English
Thermodynamic efficiency evaluation of an indirect injection Diesel engine
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