旁入穿孔管消声器压力损失研究

Research on Pressure Loss of Bypass Perforated Tube Muffler

针对旁入穿孔管消声结构的应用问题,利用Fluent软件分析了不同入口流速、穿孔直径和穿孔率下,该类消声单元压力损失的变化规律。通过对仿真结果的分析,将旁入穿孔管消声单元衍生为双旁入穿孔管和三旁入穿孔管消声器,研究衍生结构与原结构在相同穿孔直径和穿孔率这两种情形下的压力损失变化关系,结果表明,双旁入穿孔管的性能优于其他两者。通过实验测试了带有旁入穿孔管消声结构的复杂消声器,仿真和试验结果发现,在相同条件下,压力损失的仿真结果为5.75 kPa,实验结果为6.1 kPa,误差为5.73%,验证了CFD仿真的计算精度。

According to the use problem of bypass perforated tube muffler,the software Fluent was used to analyze the changing rule of pressure loss of bypass perforated tube muffler unit under different inlet flow rates,perforation diameter and perforation rate.According to the analysis of simulation results,the bypass perforated tube muffler was derived for the double and triple by-pass perforated tube muffler,and relation was researched of the difference of derived structure and the original structure under the same perforation diameter and perforation rate in pressure loss. And the result shows that the double bypass perforated tube muffler has a better performance than other two. By test on the muffler which contains by-pass perforated tube,the result of simulation and test shows that that pressure loss is 6. 1 kPa,as by simulation the result is 5. 75 kPa,so the error is only 5. 73%,which verifies the calculation accuracy of computer fluid dynamics（ CFD） simulation.