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为了适应严格的飞机适航噪声标准,降低发动机排气噪声是现今涡扇发动机设计时必须考虑的因素之一。本文采用大涡模拟(LES)和声学软件,计算了不同边界条件下排气喷管流场及声场特性。研究表明,喷管入口压比和温度同时影响着喷流噪声,当压力增大时,喷流噪声的声压级整体随之增加,且在-36°到36°区间增大幅值明显。内涵入口温度增加时,总声压级整体增加,且当内涵入口温度每升高100K时,总声压级增加幅度为2-4d B。
In order to meet the rigorous airworthiness standards of aircraft, reducing engine exhaust noise is one of the factors that must be considered when designing turbofan engines. In this paper, large eddy simulation (LES) and acoustic software are used to calculate the flow field and sound field characteristics of the exhaust nozzle under different boundary conditions. The results show that the jet pressure and temperature affect the jet noise at the same time. When the pressure increases, the sound pressure level of the jet noise increases as a whole, and the amplitude increases sharply from -36 ° to 36 °. When the inlet temperature increases, the total sound pressure level increases as a whole. When the inlet temperature increases by 100K, the total sound pressure level increases by 2-4d.