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针对旋翼流场计算中关键的运动嵌套网格技术,提出了一个新的网格单元关系快速判断方法。该方法通过计算特殊网格点在背景网格上的位置来建立桨叶网格在背景网格中所占据范围的关系,并用于嵌套网格洞单元的识别,又进一步将该方法推广用于Inverse Map的建立,在此基础上,建立了一套用于前飞流场计算的运动嵌套方法。通过多种前飞旋翼测试算例,分别评估了背景网格、桨叶网格尺寸改变对计算时间的影响,同时验证了该方法的可靠性,结果表明构建网格嵌套关系所用时间随桨叶网格和背景网格尺寸的变化幅度较小,且具有良好的鲁棒性,能够满足旋翼前飞状态计算的需要。最后,在基于前飞非定常N-S/Euler流场求解器中,采用该方法模拟了UH-60A和7A旋翼悬停/前飞状态的气动特性,通过计算时间的对比体现出该方法的高效性,并且流场计算结果与试验数据对比表明该方法可以有效地用于旋翼前飞非定常流场的计算。
Aiming at the key motion nested grid technology in the calculation of rotor flow field, a new method of rapid judgment of the grid cell relation is proposed. In this method, the relationship between the grids in the background grids is established by calculating the position of the special grids on the background grids, which is used to identify the nested grid cells. The method is further extended to use Based on the establishment of Inverse Map, a set of motion nesting methods for the calculation of forward flow fields is established. The influence of background grid and blade grid size on calculation time is evaluated by a variety of test examples of front rotor. The reliability of the method is verified. The results show that the time spent constructing grid nesting relationship varies with paddle Leaf grid and background grid size change range is small, and has good robustness, to meet the needs of the rotor before the flight state calculation. Finally, this method is used to simulate the aerodynamic characteristics of the hovering / pre-flying state of the UH-60A and 7A rotors in a forward-unsteady NS / Euler flow field solver. The comparison of calculated time shows the high efficiency of this method The comparison between the calculated results and the experimental data shows that the proposed method can be used to calculate the unsteady flow field before the rotor flight.