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分离涡模拟(Detached eddy simulation,DES)方法是目前支撑叶轮机械精细化设计的高精度且工程可实现的数值模拟方法之一。本文简要回顾了DES类方法的发展历程、存在问题和解决方法,并以基于一方程的DES类方法为例阐明其构造思路。在准确性验证方面,针对叶轮机械中普遍存在的分离和转捩现象,结合当前DES类方法对经典物理模型的模拟结果,分析了DES类方法对该现象的预测能力。在此基础上,对DES类方法在直叶栅、亚声速和跨声速叶轮机械内流场的预测精度及应用现状进行了简要评述,并着重分析了当前DES类方法在叶轮机械应用中需要兼顾的问题,为下一步DES方法在高性能压气机设计中的应用提供参考。
Detached eddy simulation (DES) method is one of the most accurate and technically feasible numerical simulations for the mechanical refinement of impeller. This article briefly reviews the development history, existing problems and solutions of the DES class method, and illustrates the construction method based on the DES class method based on one equation. In the field of accuracy verification, aiming at the phenomena of separation and transition commonly found in impeller machinery, combined with the simulation results of the classical physical model by the current DES method, the prediction ability of the DES method for this phenomenon is analyzed. On this basis, the prediction accuracy and application status of DES method in the flow field of straight blade cascades, subsonic and transonic impeller are briefly reviewed, and the current DES methods in the impeller mechanical applications need to be taken into account Which will provide a reference for the application of DES method in high performance compressor design.