基于Kirchhoff方法的跨音速螺旋桨的气动声学计算

AEROACOUSTIC CALCULATION OF A TRANSONIC PROPELLER BY USING KIRCHHOFF METHOD

本文采用Ｋｉｒｃｈｈｏｆ方法计算双桨叶Ｈａｒｔｚｅｌ跨音速螺旋桨的远场气动噪声。Ｋｉｒｃｈｈｏｆｆ面为包围整个螺旋桨的固定圆柱面，首先采用ＦＬＯＷｅｒ软件包直接求解Ｅｕｌｅｒ方程得到圆柱内和圆柱面上的近场气动流场解，然后根据Ｋｉｒｃｈｈｏｆ方法求解远场声场。通过计算详细研究了圆柱的直径和高度对远场声场的影响，以及圆柱各部分对远场声压的贡献，文中同时给出了Ｆａｒａｓｓａｔ线性方法的计算结果。与实验值的比较表明，通过选取适当的圆柱直径。

The aeroacoustic field generated by a transonic two-blade Hartzell propeller was calculated by using Kirchhoff method.The Kirchhoff surface was defined as a nonrotating cylinder surrounding the whole propeller blade.The aerodynamic flowfield was firstly computed by using the Flower code running in the Euler mode,then the farfield acoustic pressure was calculated with the Kirchhoff method.A detailed numerical study revealed the influence of the radius and height of the cylinder on the acoustic pressure in the farfield.The results obtained by the Farassat's linear method were also presented and compared with the presented results.The comparison of the results obtained by both the methods with experimental data demonstrated that the Kirchhoff method considering most of the nonlinear effects gave a better results than the linear method.