摘要
采用大涡模拟结合动力Smagorinsky亚格子模型对四喷管超声速高温射流进行了三维非稳态数值模拟。基于非稳态计算的结果,利用FW-H面积分方法对四喷管射流远场的声学特性进行计算,并将结果与单喷管得到的结果进行对比。结果表明,多喷管射流形成了复杂的流场,其产生的气动声场并不仅仅是单喷管简单的叠加,由于四股射流之间的相互影响使得声场也产生了新的特点,不但表现在总声压级数值上,还对改变了射流噪声辐射的指向性,最大声压级的位置由原来的50°左右变化到30°。
Large Eddy Simulation(LES) with Dynamic Smagorinsky Sub-Grid Model(SGS) was applied to simulate the 3-D unsteady supersonic hot multi-jet flow.Based on the results of the simulation,far field aeroacoustics of multi-jet were predicted by the Ffowcs Williams-Hawkings(FW-H) surface integral method and the results were compared with single nozzle.It shows that the flow field of multi-jet is complicated and the sound fields are not just a simple superposition of single nozzle.Some new characteristics are shown up.It changes not only the Overall Sound Pressure(OASPL) profile,but also the direction of radiation from 50° to 30°.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2012年第3期430-435,共6页
Journal of Propulsion Technology
基金
国家自然科学基金(51005179)
关键词
多喷管
射流流场
气动声学
数值模拟
大涡模拟
Multi-nozzles
Jet flow
Aeroacoustics
Numerical simulation
Large eddy simulation(LES)