Simulation of Noise Generation in Near-Nozzle Region of a Chevron Nozzle Jet
Simulation of Noise Generation in Near-Nozzle Region of a Chevron Nozzle Jet
复制标题
V 形喷嘴射流近喷嘴区域噪声产生的模拟
DOI：
10.2514/1.36659
复制
发表时间：
2009
期刊：
影响因子：
2.5
通讯作者：
M. Y. Hussaini
中科院分区：
文献类型：
--
作者：
A. Uzun;M. Y. Hussaini
本文报道了一个中等雷诺数冷喷流从achevron喷管排出的近喷管区的模拟。格伦研究中心。这种喷嘴设计包含六个对称的V形，具有5度的穿透角。采用高精度的多块流场数值模拟方法，同时计算了人字形喷管内的流动和喷管外的自由射流，大涡模拟程序，具有重叠网格能力，模拟的分辨率约为1亿个脊点，模拟的主要重点是捕捉增强的剪切，在喷嘴下游的最初几个直径范围内，由于人字形结构引起的层间混合，以及随之产生的噪声，都发生在射流的混合层中退出.详细的计算方法一起提出的模拟结果的分析。模拟数据进行了比较，与现有的实验测量的流场和噪声频谱的边线方向。总体而言，模拟结果非常令人满意，并证明了使用我们的模拟方法进行人字形射流计算的可行性。诺姆茨
This paper reports on the simulation of the near-nozzle region of a moderate Reynolds number cold jet flow exhaustingfrom achevron nozzle.Thechevron nozzleconsideredinthis studyisthe SMC001nozzleexperimentally studied by researchers at the NASA John H. Glenn Research Center. This nozzle design contains six symmetric chevrons that have a 5-deg penetration angle. The flow inside the chevron nozzle and the free jet flow outside are computed simultaneously by a high-order accurate, multiblock, large-eddy simulation code with overset grid capability.Theresolutionofthesimulationisabout100milliongridpoints.Themainemphasisofthesimulationisto capture the enhanced shear-layer mixing due to the chevrons and the consequent noise generation that occurs in the mixing layers of the jet within the first few diameters downstream of the nozzle exit. Details of the computational methodology are presented together with an analysis of the simulation results. The simulation data are compared with available experimental measurements of the flowfield and the noise spectrum in the sideline direction. Overall, thesimulationresultsareveryencouraginganddemonstratethefeasibilityofchevronnozzlejetcomputationsusing our simulation methodology. Nomenclature c