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提出了一种将RANS(Reynolds averaged Navier-Stokes)与DES(detached eddy simulation)相结合计算流场的工程新算法,并用于第一代载人飞船Mercury、第二代载人飞船Gemini、人类第一枚成功到达火星上空的Fire-Ⅱ探测器、具有丰富风洞实验数据(来流Mach数从0.50变到2.86)的巡航导弹、高升阻比的Waverider(乘波体)以及具有大容积效率与高升阻比的CAV(common aero vehicle)等6种国际上著名飞行器的绕流计算.在流场计算中,采用分区技术,即首先对全流场采用RANS计算,然后对分离较大或者分离较严重的那些区域采用DES分析技术.文中所完成的6个典型算例总共63个工况的数值计算表明:仅在分离较大的区域采用DES分析技术,虽然从严格意义上讲这样的处理并非真正意义上的DES,但这样近似处理后所得到的流场数值结果(其中包括气动力和气动热)与相关实验数据较为贴近,并且流场的计算效率较全场进行DES计算时要高得多.
A new algorithm for calculating the flow field by combining RANS (Reynolds Averaged Navier-Stokes) with DES (detached eddy simulation) is proposed and applied to the first generation of manned spacecraft Mercury, the second generation of manned spacecraft Gemini, A successful Fire-II probe over Mars, cruise missiles with rich wind tunnel experimental data (a change in the Mach number from 0.50 to 2.86), Waverider with high lift-to-drag ratio, (CAV (Common Aero Vehicle) with high resistance to dragging ratio, etc. In flow field calculation, partitioning technology is adopted, that is, firstly, RANS calculation is applied to the whole flow field, and then, for large separation or separation DES analysis is used in those areas where severe conditions are present.The numerical calculation of a total of 63 typical cases done in this paper shows that the DES analysis technique is only used in the areas with large separation, although this treatment is not strictly speaking In the true sense of the word DES, the numerical results (including aerodynamic forces and aerodynamic heats) obtained after this approximation are relatively close to the relevant experimental data and the computational efficiency of the flow field is better than that of the full field DES is much higher when calculated.