基于强化换热的偏斜尾缘设计

Flow and heat transfer analysis on deflection trailing edge structure

采用SST湍流模型对偏斜尾劈缝射流的流动结构与传热特点进行模拟分析,研究不同尾缘射流速比,入口攻角及偏折角对于尾缘位置边界层状态、涡流结构、尾迹形态及流动损失的影响规律。结果表明:偏斜尾缘劈缝射流的使用能够有效改善尾缘位置的换热性能,射流对于尾缘折转区的冲刷作用使得吸力面侧得到较好的冷却;偏斜尾缘的采用也能够有效抑制大入口攻角下吸力面的负压梯度;过大的转折区将在下游引起较大的尾迹涡,并造成更大的尾迹损失;根据不同入口条件,存在一个最佳的射流偏折角。

SST turbulence model is used to simulate and analyze the flow structure and heat transfer characteristics of the skewed blade tail split slotted jet.The effects of different flow velocity and angle of the tail edge jet on the boundary layer state,vortex structure,wake shape and flow loss at the tail edge are studied.Results show that the use of a deviated tail split jet helps improve the heat transfer performance at the trailing edge position.The scouring effect of the jet on the trailing edge turning zone makes the suction side better cooled.After using the trailing side of the turning zone,the flow separation on the suction side is greatly improved under a large entrance angle of attack.An excessively large turning zone will cause a large wake vortex downstream and cause a larger wake loss.According to different inlet conditions,there is an optimal jet bends.