湍流模型对喷流计算精度的影响研究(英文)

Effects of turbulence models on the numerical simulation of nozzle jets

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。

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 distribution 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.