湍流模型对喷流计算精度的影响研究(英文)

采用三维RANS代码MBNS3D对包含了内流、外流及后体干扰的三种简化尾喷流,进行了数值模拟研究。通过壁面压力分布及喷流截面速度型与实验数据的对比,研究了SA和SST两种湍流模型及其修正(SACC,SADES,SSTCC)对喷流计算精度的影响。本文计算表明,SSTCC模拟效果最为精确;利用SA模型进行脱体涡模拟,在同样的网格下优势不明显。湍流模型可压缩修正改善了模拟喷流的膨胀趋势,但对附面层分离位置的预测,在本文的工作中,还不如原始模型。两类模型相比,SST模型的结果好于SA模型。

Effects of turbulence models on the numerical simulation of nozzle jets

Three different jet flows, which characterized by internal flow, internal and external mixing flow and after-body interference, were simulated numerically with the three-dimensional Reynolds Averaged Navier-Stokes code MBNS3D.These simulations are focused on the effects of two representative turbulence models (the S-A and the k-ω SST model) and their compressibility correction schemes on some typical nozzle flows.Wall pressure distribu-tion and jet velocity profile are compared with experimental data.Results show that better agreement can be obtained in nozzle flow simulations with the k-ω SST model and its compressibility correction, and the advantage of the S-A detached eddy simulation is not remarkable on the same grid compared simulation with the S-A model.