Effect of Helix Parameter Modification on Flow Characteristics of CIDI Diesel Engine Helical Intake Port
Kunjan Sanadhya, N. P. Gokhale, B.S. Deshmukh, M.N. Kumar and D.B. Hulwan
Kirloskar Oil Engines Ltd., Pune, India, Vishwakarma Institute of Technology, Pune, India
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This project work involves experimental investigation of helical inlet port flow characteristics for cylinder head of Direct Injection (D.I) diesel engine. The average flow coefficient and swirl number is obtained using a paddle wheel test bench. Intake port helix parameters, i.e., distance between peripheral side wall and valve axis ‘Dp’, width of helical section parallel to valve axis ‘W’ and initial width of the helix ‘Wh’ are measured for different flow boxes for selected different bore and stroke engines. These parameters are modified and detailed analysis has been done to establish the effect on swirl number and average flow coefficient. The second part of work focused on the Computation Fluid Dynamics (CFD) to study flow velocity, flow distribution inside cylinder and to analyze effect of helix parameter change. The experimental study of combined effect of helix parameters, ‘W’, ‘Wh’ and ‘Dp’ indicates that this modification can be initiated for improving flow characteristics if change required in average flow coefficient is small as compared to higher amount of change required in swirl number. The CFD analysis with this modification also shows improvement in swirl generation and flow distribution.