考虑固体颗粒的自由喷流噪声的数值研究

Numerical Study of Free Jet Noise Considering Solid Particles

研究固体颗粒对喷流流场和声场的影响.选取6种不同的湍流模型,对自由喷流进行稳态计算分析,对比发现RNG k-ε模型最适合用于稳态喷流数值模拟;采用LES模型计算喷流的非稳态结果,并结合FW-H方程进行了喷流声场分析,与试验数据进行对比,验证了数值模型的正确性;在此模型的基础上,添加固体颗粒研究其对自由喷流流场和声场的影响,仿真结果表明固体颗粒的存在减小了喷流流场的超音速段长度,显著提高了喷流温度;增大了喷流下游区域噪声,减小了中上游区域噪声.

The effect of solid particles on the jet flow field and sound field was investigated.Six different turbulence models were to analyze the steady-state calculation of free jets.It s found that the RNG k-εmodel was most suitable for numerical simulation of steady-state jets.The LES model was used to calculate the unsteady results of the jet flow,and the FW-H equation was used to analyze the jet sound field.The comparison with the experimental data verified the correctness of the numerical model.Based on this model,the effect of solid particles on the free jet flow field and sound field was studied.The simulation results show that the presence of solid particles reduces the supersonic length of the jet flow field and significantly increases jet temperature.And it increases the noise in the downstream region of the jet and reduces the noise in the mid-upstream region.