摘要 采用分离涡模拟方法对双缝激波诱导推力矢量喷管的三维流场进行数值模拟,分析原始流场的流线、压力系数分布。运用傅里叶模态分解技术对喷管对称面压力系数进行模态分解和时间演化。结果表明:双缝激波诱导推力矢量喷管的流场中包含两个模态,一阶模态主要表现为下游二次流口激波处和尾流上剪切层处的压力振荡,二阶模态主要表现为剪切层处涡的脱落。本文对研究矢量喷管非定常流场特定频率下对应的潜在动力学信息具有重要意义。 The three-dimensional flow field of the thrust vectoring nozzle was simulated by detached eddy simulation(DES)method,and the streamline distribution and pressure coefficient distribution of flow field were analyzed.Fourier mode decomposition technique was used to decompose the pressure coefficient on the nozzle symmetry surface and evolve it in time.The numerical results indicate that the flow field of the dual-slot injection ports shock-induced thrust vectoring nozzle has two major modes.The first-order mode mainly illustrates the pressure oscillation of the shock waves at the downstream slot and upper shear layer of wake.The second-order mode illustrates the shedding of vortices at shear layers.It is of great significance to study the potential dynamic information corresponding to the unsteady flow field of the vector nozzle at a specific frequency.
出处 《燃气涡轮试验与研究》 北大核心 2021年第1期5-13,共9页 Gas Turbine Experiment and Research
基金 国家自然科学基金(51476106) 辽宁省一流特色学科(15021540)。
关键词 推力矢量技术 双缝喷管 激波诱导 流动结构 傅里叶模态分解(FMD) 脱落涡 航空发动机 thrust vectoring technology dual-slots injection ports nozzle shock-induced flow structure Fourier mode decomposition(FMD) shedding vortex aero-engine
