MULTIVALVE INTAKE PORT PARAMETRIC DESIGN AND PERFORMANCE OPTIMIZATION OF THE HORIZONTAL DIESEL ENGINE

As the result of basic advantages of multi-valve intake port technology it is widely applied now, but the complex geometry of the intake port increases the difficulty of three-dimensional direct modeling. The UG and Matlab software were selected as the design platform, through the analyzing the features of the tangential port orientation section and the structural characteristics of spiral flow segment, the relational equations were all established by adopting analytical geometry method, meanwhile the flow characteristics in the inlet port and cylinder was investigated. The CFD simulation results show that: By modification of performance parameters, such as the transition angle α, helix slope angle β and the bottom slope ζ, the physical models with evident performance differences can be regenerated, and at the maximum valve lift, the flow coefficient was altered in the range from 0.563 to 0.736. The relative errors between calculated values and experimental ones are all less than 6%. This advanced design method based on the mathematical models for multivalve intake ports should be beneficial to directly construct the inlet CAD model with complex structure profile and will meet the design requirements by performance optimization.http://dx.doi.org/10.5755/j01.mech.17.6.1008