Slot film cooling — The effect of separation angle
Slot film cooling — The effect of separation angle
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槽膜冷却——分离角的影响
DOI：
10.1007/bf01180219
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发表时间：
1994
期刊：
影响因子：
2.7
通讯作者：
P. Wilmott
中科院分区：
文献类型：
--
作者：
A. Fitt;P. Wilmott
以前的研究主要集中在流动的几何形状，使槽是平齐的包容壁。已知当注入流的总压头小于自由流压头时，与槽前部的分离与壁相切（所谓的“盖”效应）。这种现象限制了来自槽的质量流量，这反过来又限制了冷却的有效性。一个吸引人的策略，以提高质量流是迫使一个非零角度的分离从上游端的槽的几何手段。本研究考虑了几何形状对质量流量的影响，并提出了可能的改进平均流量特性。基于无粘流理论的渐近分析，导出了分离流线高度的非线性奇异积分微分方程（NLSIDE）。然后数值求解该方程，并确定各种几何形状的质量流量特性。
SummaryPrevious studies of slot film cooling have mainly concentrated on a flow geometry so arranged that the slot is flush in the containing wall. It is known that when the total pressure head of the injected flow is less than the free stream head, separation from the front of the slot is tangential to the wall (the so-called ‘lid’ effect). This phenomenon limits the mass flow from the slot which in turn limits the effectiveness of the cooling. An appealing strategy to enhance the mass flow is to force a non-zero angle of separation from the upstream end of the slot by geometrical means. The present study considers the influence of the geometry on mass flow and suggests possible improvements for the mean flow characteristics. Asymptotic analysis based on inviscid flow theory is used to derive a nonlinear singular integrodifferential equation (NLSIDE) for the height of the separating streamline. This equation is then solved numerically and the mass flow characteristics determined for various geometries.