Abstract：To study the structure of the unsteady flow field and acoustic field of the podded propulsor, the DDES(delayed detached eddy simulation)method coupled with FW-H(Ffowcs Williams-Hawings)equation were used to carry out high-precision transient numerical simulations. The results show that the amplitude of the pressure pulsation in the area from propeller to the strut is increased, due to the dynamic and static interference induced by the strut. The vortex distribution of the podded propulsor is complicated. Due to the turbulence effect of the cabin, in addition to the vortex generated by the propeller itself, the structure of the interference wake vortex is also appeared, and the main region of vortex is upward offset. By calculating the standard deviations of harmonic frequencies at various sound receivers on the disk surface, it is found that the sound field has no obvious sound directionality on the disk surface. The spatial distribution characteristics of the acoustic field of the podded propulsor are obtained by setting the spatial acoustic receiver arrays. It can be found that shaft frequency and blade passage frequency are always the main frequencies. There is no obvious directivity of the sound pressure pulsation near the propeller disk, but on the space surface, the distribution characteristics of shaft frequency and blade passage frequency are obvious, where there are high and low value areas with distinct shapes. Behind the podded propulsor, the sound pressure gradually attenuates, but the energy attenuation trend of the blade passage frequency is smaller than that of the shaft frequency.
收稿日期: 2022-09-19
基金资助:江苏省研究生科研与实践创新计划项目(SJCX21_1710)
引用本文:
高波*,梅子逸,张宁,赖元庆,倪丹. 基于DDES耦合FW-H方法的吊舱推进器水动力噪声特性[J]. 排灌机械工程学报, 2024, 42(7): 693-700.
GAO Bo*,MEI Ziyi,ZHANG Ning,LAI Yuanqing,NI Dan. Analysis of hydrodynamic noise of podded propulsor based on DDES coupling FW-H method. Journal of Drainage and Irrigation Machinery Engin, 2024, 42(7): 693-700.
