Helical Intake Port Design and Experimental Analysis of Horizontal Diesel Engine

As the shape structure of helical intake port is complex, the full realization of the forward direction design still faces some difficulties and challenges. In order to establish the inlet model directly, a new method of design is used to complete the construction of physical model, meanwhile the flow field in interior space of inlet and cylinder is investigated. The simulation results show that by modification of value scales of parameters on the transition angle α, and helix slope angle β and the bottom slope angle ζ, the solid models with significantly different performance can be regenerated, at the maximum valve lift, the flow coefficient is altered in the range from 0.563 to 0.736. The cylinder head products with three different inlet models are tested on the steady flow test platform. By comparison of experimental results with the calculated values, it is found that simulative results can wonderfully indicate inlet performance variation. The combination way of forward direct modeling and performance simulation method is capable of improving the design efficiency of the intake port.