基于FW-H方程的Hartmann哨辐射声场数值研究*

该文基于声类比法,通过求解FW-H方程,对不同喷口与谐振腔位置关系的Hartmann哨的声场分布进行了分析,计算了不同位置关系的Hartmann哨的声指向性。得到了以下结论:喷口与谐振腔位置关系对Hartmann哨的发声基频几乎不产生影响。对称位置关系的Hartmann哨的声场呈对称趋势,且在垂直于喷流方向上达到最大;非对称位置关系的Hartmann哨不再呈现对称趋势。Hartmann哨的最大声压级随着偏离对称位置的距离的增加有小幅增加,最大声压级出现的方向向着谐振腔方向移动。

Numerical calculation of Hartmann whistle radiation acoustic field based on FW-H equation

Based on acoustic analogy method, by solving FW - H equation, for different nozzles and the location of cavity Hartmann whistle sound field distribution are analyzed, and calculated the relationship between the different positions of Hartmann whistle sound directivity. Got the following conclusion: the nozzle and the location of cavity of Hartmann whistle sound fundamental frequency, hardly symmetric position of Hartmann whistle sound field showed a trend of symmetry, and reached the maximum in the direction perpendicular to the jet stream. Hartmann sentinels with asymmetric position relationships are no longer symmetrical. The loudest pressure of the Hartmann whistle increases slightly as the distance from the symmetrical position increases, and the loudest level appears to move in the direction of the resonator.