离散涡方法在多级叶轮机械流体计算中的应用  

Application of Discrete Vortex Method to Turbomachine Stage

作　　者：俞大邦[1,2] 吴文权[1,2] 

机构地区：[1]上海大学上海市应用数学和力学研究所 [2]华东工业大学

出　　处：《上海大学学报（自然科学版）》1997年第4期413-419,共7页Journal of Shanghai University:Natural Science Edition

摘　　要：本文首次应用离散涡方法求解了具有动静叶栅的不稳定流场，特别是当流动产生分离时的流场．本文应用离散涡方法的求解不需要象通常那样：假设在动静叶栅之间存在一个混合面，在该混合面上流动参数沿周向平均，并作为后排叶栅的进口条件．其结果使流动数值模拟较真实．事实上，叶栅后的流动沿周向是不均匀的，特别是当流动发生大尺度分离时，不均匀性尤其明显．文章基于离散涡方法提出了求解动静叶栅统一流场中如何确定解的唯一性问题，它使得整个求解成为可能．文章给出了在不同情况下（不同的气流进口角；不同的相对于动静叶栅而言的周向位置；动静叶栅之间不同的间距）的流动数值模拟结果；还给出了它们的相对和绝对流线图，其中包括了失速分离流动时的流场，这些结果为研究失速分离流动提供了有价值的参考．文章就数值模拟与实验结果进行了比较．his paper solved unsteady flow field with a moving and a static cascades using the discrete vortex method for the first time, especially the flow field with separated flow. The method presented by the paper employing a discrete vortex need not assume that there is a mixing plane between two blade rows, whose flow properties are averaged circumferentially, which makes the flow simulation be closer to the reality. In fact, the flow properties along the rotational direction behind a cascade are not uniform, especially when the flow separation takes place. The paper put forward a method of how to determine the uniqueness of the solution based on a discrete vortex method to solve the unified flow field. The method made using a discrete vortex method to solve become feasible. The results of the numerical flow simulation under different conditions: different attacks, different circumferential positions about a moving and a static one, different distance between the two adjacent cascades and so on, are presented, and their absolute and relative streamline figures, some of them with stall separated flow are presented too, which provide research of stall or separated flow with valuable reference. The paper made a comparison with an experiment.

关 键 词：流动分离 叶轮机械 离散涡 数值模拟 

分 类 号：TB126[理学—工程力学]