基于STAR-CCM+的通机整机流场数值模拟

基于CFD方法,采用STAR-CCM+?11.06流体仿真软件对某通机整机流场特性进行分析,研究了风扇罩开孔、箱体底部开孔、风扇罩内侧挡板及位置等对流场特性及风量分配的影响.对6种不同结构改进方案的仿真结果表明:不同结构下整机流场分布特性与其原始结构分布特性基本一致,发动机表面平均速度相差不大;箱体底部开孔面积从240...

Numerical Simulation on Flow Field Analysis of General Purpose Engine Based on STAR-CCM+

Based on CFD technology, the flow field characteristics of a general purpose engine are analyzed by fluid dynamics simulation software STAR-CCM+ 11.06, and the effects of the opening of the fan cover, the opening of the bottom of the box, the inner baffle and position of the fan cover on the flow field characteristics and air distribution are studied. The results of six different structural improvement programs show that the flow field distribution characteristics of the general purpose engine under different structures are basically the same as that of the original structure, and the average cell relative velocity of the engine surface is almost the same. The improved structure with the hole area at the bottom of the engine crankcase increased from 240 mm2 to 320 mm2 and the baffle in the right part of the fan hood moved up 5 mm has better flow field distribution characteristics. The air volume distribution of the improvement design at the bottom of the engine crankcase, the middle of the cylinder head and the cooling ducts near the exhaust duct is slightly better, and the total air volume at the fan inlet of the design five is significantly increased, which is 6% higher than that of the original structure, which is conducive to the improvement of the cooling performance of general purpose engine. The flow field analysis and the flow field characteristic evaluation of the structural scheme design provide the theoretical support for the early design and development of the follow-up products and the system matching work procedures.