Influence of intake port design on diesel engine （在柴油机进气道设计的影响）.pdfVIP

Indian Journal of Engineering Materials Sciences Vol . 6; April 1999, pp . 53-58 Influence of intake port design on diesel engine air motion characteristics M Raghu Prarnod S Mehta • Internal Combustion Engines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology, Chennai 600 036, India Received 26 May /998; accepted / January /999 The intake system has a major influence on the performance of diesel engines . In this work, the performance of intake system, for both directed and helical port, is carried out based on a mean flow consideration . A quasi-steady emptying- . filling method has been used in the present analysis to estimate the instantaneous mass flow rate for evaluation of intake swirl. The model validation for both directed and helical ports is carried out using available experimental data in literature . A detailed parametric study has been presented to highlight the role of such an analysis in intake port design and evaluation for required air motion characteristics. In a four stroke direct injection (01) diesel engine, the or the swirl ratio. mixing of fuel and air takes place inside the combus- For predicting intake generated swirl, a single re- tion chamber on injection of fuel near the end of sultant direction for the flow entering the cylinder compression stroke . Consequently, the time available past the valve9- 12 is generally implied. Mehta and for proper mixing of fuel and air and their burning is Chaturvedi 12 summarized the various basis of model- quite small. For accelerated mixing, either