Study On RE/CFD/CAM Development Flow Of Four-Valve Diesel Engine

The structure of intake port directly affects the quantity of fresh air and the strength of swirl in cylinder, which have relations with mixture forming, so affects the combustion, exhaust and total performance. Based on experiential design and steady flow test, the traditional port design method needs a long developing period, moreover is hard to get the ideal scheme. The design-analysis-manufacture process of the product could be digitized by using RE/CFD/CAM technology, and the accurate prediction of the Intake Port performance and improvement could be made before being manufactured, so that it could advance the machine precision, reduce cost of the product, shorten manufacture cycle of mould, improve the quality of the product. The research on intake port in this method could be used not only to improve the actual port, but also to digest the advanced port design with accuracy and quickness.In this dissertation, the author summarizes the development and research on diesel intake port, and brings forward the target and the meaning of researching on the reverse design process of the intake port in 4-valve diesel engine; builds up the three dimensional geometric model of the intake port of YCJ6000 via reverse engineering; simulates the flow status in double ports (helical-port and directional port) -valve-cylinder by using the CFD software FIRE; produces the negative model box of intake port core by the method of Numerical Controlling Machining; validates the CFD calculation result and the steady flow test result of the core box via the Ricardo and FEV evaluation acquired through the flow test of cylinder head, and draws a conclusion that the three show good agreement with each other, which shows the feasibility of the RE/CFD/CAM design process for intake port.