航空学报2025，Vol.46Issue(14)：88-102,15.DOI:10.7527/S1000-6893.2025.31447
超声速单/双矩形喷流气动噪声数值研究
Numerical research on aeroacoustics of supersonic single/twin rectangular jets
摘要
Abstract
Rectangular nozzles are increasingly valued in military aircraft design due to their excellent thrust vectoring control and stealth performance.However,twin jet coupling remains an attractive aero-acoustic problem as its noise characteristics and sound generation mechanism are still not well understood.In this paper,numerical simulations of supersonic under-expanded single/twin rectangular jets are conducted.High-precision numerical schemes and implicit large eddy simulation methods are used,and the predicted flow and acoustic characteristics of the single jet show good agreement with the experimental results.The findings indicate that when twin jet spacing is 3.5h,the interaction between twin jets has little impact on the internal structure and shear layer development of the jets.There are signifi-cant differences in the overall sound pressure level distribution and the noise directivity between single and twin jets.Compared with the single jet,twin jets exhibit a slightly reduced screech frequency,and a significantly increased inten-sity.Fourier mode decomposition and spectral proper orthogonal decomposition are employed to extract coherent structures in the flow field.A helical mode is revealed in the single jet,while in the twin jets,the mode switches to a flapping mode along the minor axis with the two jets oscillating in phase.Modal analysis further highlights the relation-ship between changes in screech frequency and intensity and the shift in the sound source location.关键词
矩形喷管/双喷流耦合/气动噪声/谱本征正交分解/大涡模拟Key words
rectangular nozzle/twin-jet coupling/aeroacoustics/spectral proper orthogonal decomposition/large eddy simulation分类
航空航天引用本文复制引用
查君培,陈保,吴飞,李伟鹏..超声速单/双矩形喷流气动噪声数值研究[J].航空学报,2025,46(14):88-102,15.基金项目
国家自然科学基金(12372221) National Natural Science Foundation of China(12372221) （12372221）
