动力喷流效应混合方法数值模拟研究  

Numerical Investigation of Powered Jet Effects by RANS/LES Hybrid Methods

作　　者：龚志斌 李杰[2] 单继祥[1] 张恒[2] GONG Zhibin;LI Jie;SHAN Jixiang;ZHANG Heng(Institute of Engineering System of CAEP,Mianyang 621900,China;School of Aeronautics,Northwestern Polytechnical University,Xi′an 710072,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900 [2]西北工业大学航空学院,陕西西安710072

出　　处：《西北工业大学学报》2019年第3期565-571,共7页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金(11172240)资助

摘　　要：从动力喷流效应精细化模拟需求出发,在 k-ω SST湍流模型基础上建立了IDDES混合方法,采用了有限体积五阶WENO格式提高空间离散格式精度,开展了动力喷流效应混合方法数值模拟分析及应用研究。基于自由发展喷管流动和ARN2喷管算例,开展了动力喷流效应混合方法数值模拟验证分析,结果表明增加网格密度和提高空间离散格式可有效改善喷流速度分布预测结果,缩短喷管出口下游非物理流动稳定状态,瞬态流场结构更加清晰合理,湍流强度预测更加准确。在此基础上,针对较为实际的涡扇发动机模型,完成了动力喷流效应混合方法数值模拟分析,得到了内、外涵喷流和外界气流的相互干扰及掺混特征,得到了三维湍流结构特征。For the high-precision simulation of engine jet effects, an improved delayed detached eddy simulation (IDDES) method based on the two-equation shear stress transport (SST) model is developed, and the fifth-order finite-volume weighted essentially non-oscillatory (WENO) scheme is employed to enhance accuracy of spatial discretization, and then numerical investigation of powered jet effects by RANS/LES hybrid methods is carried out. The effects of the grid distributions and the accuracy of the spatial schemes are discussed during the RANS/LES validation analysis on the fully expanded jet flow and Acoustic Reference Nozzle (ARN) jet flow. The results show that, by enlarging the grid density and improving the accuracy of the spatial schemes, the velocity distributions in the jet flow can be better predicted, the non-physical steady flow after the jet nozzle can be shortened, the instantaneous flow structures are clearer and the turbulent intensities are more accurate. Then IDDES simulation of turbofan engine jet flow is carried out. The mixing characteristics of the external fan jet flow and internal core jet flow as well as the ambient flow are obtained, and the three-dimensional turbulent structures are also given.

关 键 词：动力喷流效应 IDDES混合方法 空间离散格式精度 网格密度 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]