内插管抗性消声器的CFD仿真及压力损失研究

Research on Pressure Loss and CFD Simulation of the Insert-pipe Resistance Mufflers

利用CFD技术,对典型内插管式消声器的流场进行了仿真分析,研究了内插管的长度改变时,消声器内部速度及压力损失的变化规律,并结合典型结构消声器的试验进行了分析.发现,内插管长度越大,消声器的压力损失越小;兼具前后内插管的消声器压力损失比较小,并且前长后短型内插管消声器的压力损失小于前短后长型;随入口流速增大,压力损失呈抛物线规律增大.仿真和试验研究发现,在相同入口边界条件的前提下,压力损失仿真结果为2 305.883 Pa,试验测量结果为2 009 Pa.

Simulation and analysis have been done for typical insert-pipe mufflers with CFD technique. When altering the lengths of the insert-pipes, rule of velocity field and pressure loss internal mufflers change is studied, and combining test on the practical mufflers of typical structures, some analyses are carried on. It is found that the bigger the length of the insert-pipe is, the smaller the pressure loss of the muffler will be. The pressure loss of mufflers which have fore-and-aft insert-pipes at the same time is relatively smaller, and pressure loss of muffler with fore-longer and aft-shorter insert-pipe is smaller than that of muffler with fore- shorter and aft- longer insert pipe. With the inlet velocity increasing, the pressure loss will get bigger according to parabolic law. Through simulation and experiment, it is found that, with the same inlet-boundary conditions, the simulation pressure loss is 2 305. 883 Pa, and the measuring result is 2009 Pa.