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首页> 外文会议>ASME Turbo Expo >Preventing Hot Gas Ingestion by Film-Cooling Jets via Flow-Aligned Blockers
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Preventing Hot Gas Ingestion by Film-Cooling Jets via Flow-Aligned Blockers

机译：通过流量排列的阻挡剂防止通过薄膜冷却射流摄取热气体

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Flow aligned blockers are proposed to minimize the entrainment of hot gases underneath film-cooling jets by the counter-rotating vortices within the jets. Computations, based on the ensemble-averaged Navier-Stokes equations closed by the realizable k-e turbulence model, were used to assess the usefulness of rectangular prisms as blockers in increasing film-cooling adiabatic effectiveness without unduly increasing surface heat transfer and pressure loss. The Taguchi's design of experiment method was used to investigate the effects of the height of the blocker (0.2D, 0.4D, 0.8D), the thickness of the blocker (D/20, D/10, D/5), and the spacing between the pair of blockers (0.8D, 1.0D, 1.2D), where D is the diameter of the film-cooling hole. The effects of blowing ratio (0.37, 0.5, 0.65) were also studied. Results obtained show that blockers can greatly increase film-cooling effectiveness. By using rectangular prisms as blockers, the laterally averaged adiabatic effectiveness at 15D downstream of the film-cooling hole is as high as that at 1D downstream. The surface heat transfer was found to increase slightly near the leading edge of the prisms, but reduced elsewhere from reduced temperature gradients that resulted from reduced hot gas entrainment. However, pressure loss was found to increase somewhat because of the flat rectangular leading edge, which can be made more streamlined.
机译：提出了流动对准的阻挡者，以通过喷射内的反向旋转涡流最小化薄膜冷却喷射下方的热气体的夹带。基于由可实现的K-E湍流模型关闭的集合平均Navier-Stokes方程的计算用于评估矩形棱镜的用性，因为在没有过度增加的表面传热和压力损失的情况下，矩形棱镜随着薄膜冷却绝热有效性而进行阻断。 Taguchi的实验方法的设计用于研究阻挡者的高度（0.2d，0.4d，0.8d）的影响，阻挡者的厚度（d / 20，d / 10，d / 5），以及一对阻挡液（0.8d，1.0d，1.2d）之间的间隔，其中d是薄膜冷却孔的直径。还研究了吹出比率（0.37,0.5,0.65）的影响。得到的结果表明，阻滞剂可以大大提高薄膜冷却效果。通过使用矩形棱镜作为阻塞者，在薄膜冷却孔下游的15D下游的横向平均绝热效果高于下游的1D。发现表面传热略微增加棱镜的前缘，但从降低的热气体夹带中导致的温度梯度降低。然而，由于扁平的矩形前缘，发现压力损失有所增加，这可以更流动地变得更流动。

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