航空学报 > 2024, Vol. 45 Issue (18): 129865-129865   doi: 10.7527/S1000-6893.2024.29865

压气机整机超大规模非定常模拟关键技术

王子维1,2, 范召林1,2, 李彬2, 曹杰2, 邓亮2, 王年华2, 江雄2()   

  1. 1.国防科技大学 高超声速技术实验室,长沙 410073
    2.中国空气动力研究与发展中心,绵阳 621000
  • 收稿日期:2023-11-13 修回日期:2023-12-20 接受日期:2024-03-05 出版日期:2024-03-18 发布日期:2024-03-14
  • 通讯作者: 江雄 E-mail:13990153582m@sina.cn
  • 基金资助:
    省部级项目

Key technologies for massive unsteady simulation of whole compressor

Ziwei WANG1,2, Zhaolin FAN1,2, Bin LI2, Jie CAO2, Liang DENG2, Nianhua WANG2, Xiong JIANG2()   

  1. 1.Hypersonic Technology Laboratory,National University of Defense Technology,Changsha 410073,China
    2.China Aerodynamics Research and Development Center,Mianyang 621000,China
  • Received:2023-11-13 Revised:2023-12-20 Accepted:2024-03-05 Online:2024-03-18 Published:2024-03-14
  • Contact: Xiong JIANG E-mail:13990153582m@sina.cn
  • Supported by:
    Provincial or Ministerial Level Project

摘要:

航空发动机压气机整机往往包含多个涵道以及多达十几个压气机级,全环非定常模拟技术是提高其内流场模拟保真度的手段之一。压气机整机数十亿量级的全环网格量导致非定常模拟计算量巨大,开发具备高可扩展度的用于超大规模压气机非定常CFD模拟的求解器十分必要。基于团队自主发展的轴流压气机气动性能数值模拟软件ASPAC,给出了基于分区后单通道网格定常流场生成分区后全环网格初场的通用解决方案;对国际上基于单通道壁面距离生成全环壁面距离的方法进行了分析和测试,给出该方法导致非定常模拟结果产生的偏差分布区域和量级;发展了考虑网格畸变的叶排交界面网格重叠定位策略;完成了压气机非定常模拟的MPI/OpenMP混合并行改造,并通过优化求解流程,解决了OpenMP并行模拟时的数据竞争问题。结果表明,发展的方法成功应用于双涵道13级压气机61.16亿网格的10万核级全环非定常模拟。MPI/OpenMP混合并行模式基本解决了叶排交界面动态插值处理导致的负载不平衡问题,10万核相比万核的并行效率达到84.7%,远高于MPI并行模式46.7%的并行效率。

关键词: 双涵道, 13级压气机, 全环非定常模拟, 壁面距离, MPI/OpenMP混合并行

Abstract:

The aero-engine compressor often contains multiple ducts and up to a dozen compressor stages, and the full-annulus unsteady simulation technology is one of the means to improve the fidelity of its internal flow field simulation. The billions of the compressor grids result in a huge amount of unsteady simulation computation, necessitating the development of a highly scalable solver for the massive unsteady CFD simulation of the compressor. Based on the in-house software ASPAC, a universal solution to generating the initial field of the full-annulus grid after partitioning based on the single channel grid steady flow field is provided; analysis and testing are conducted on the international method of generating full-annulus wall distance based on the single channel wall distance, and the deviation distribution area and magnitude caused by this method in unsteady simulation results are given. We further develop a grid overlap localization strategy for the blade row interface considering grid distortion, conduct the MPI/OpenMP hybrid parallel transformation of compressor unsteady simulation, and solve the problem of data competition during OpenMP parallel simulation by optimizing the solution process. The results show that the developed method has been successfully applied to the full-annulus unsteady simulation of a twin-spool 13-stage compressor with 6.116 billion grids using 102 400 CPU cores. The MPI/OpenMP hybrid parallel mode has basically solved load imbalance caused by the dynamic processing of the blade row interface interpolation. The parallel efficiency of the 102 400 cores compared to the 10 240 cores is 84.7%, far higher than that of the MPI parallel mode of 46.7%.

Key words: twin-spool, 13-stage compressor, full-annulus unsteady simulation, wall distance, MPI/OpenMP hybrid parallel

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