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分析了带圆孔的平板这一基本的冷却结构的热弹耦合特性,研究了定常状态下影响热应力的因素.采用了多场耦合的计算方法预测并分析了平板圆孔气膜冷却的热应力分布,系统地分析了入射角、复合角和吹风比对热应力的影响.结果表明:平板内整体热应力远小于气膜孔周边的热应力,热应力主要集中在气膜孔前缘线和尾缘线附近,而气膜孔两侧的热应力仍保持较低的水平;施加于气膜孔的内力垂直于气膜孔的轴线.吹风比越大,气膜孔附近的温度梯度就越大,从而气膜孔的前缘线和尾缘线的热应力更加集中.入射角越小,气膜孔周边的热应力越大,而且热应力会更加集中在气膜孔出口的前缘点和入口的尾缘点上.复合角的存在有助于弱化热应力集中.
The thermo-elastic coupling characteristics of a basic cooling structure with a circular hole are analyzed and the factors which affect the thermal stress in a steady state are studied.The multi-field coupled calculation method is used to predict and analyze the heat transfer The results show that the overall thermal stress in the slab is much less than the thermal stress around the film hole, and the thermal stress mainly concentrates on the front edge of the film hole And the trailing edge of the line, and the thermal stress on both sides of the film hole remains low; the internal force applied to the film hole is perpendicular to the axis of the film hole. The greater the hair blowing ratio, the temperature gradient near the film hole The larger the thermal stress on the leading edge and the trailing edge of the film hole is, the smaller the incident angle is, the greater the thermal stress around the film hole is, and the thermal stress is more concentrated on the leading edge of the film hole outlet Point and the entrance of the tail edge point. The existence of compound angle helps to weaken the thermal stress concentration.