【摘 要】
：
数值模拟了不同出口宽度的扇形孔射流在不同吹风比下的气膜冷却效率,侧重于分析涡流结构和涡量对冷却效率的影响。结果表明,出口宽度增大不但减小了涡量,还改变了涡流方向。
【机 构】
：
沈阳航空航天大学动力与能源工程学院,沈阳发动机设计研究所内流传热研究室,
论文部分内容阅读
数值模拟了不同出口宽度的扇形孔射流在不同吹风比下的气膜冷却效率,侧重于分析涡流结构和涡量对冷却效率的影响。结果表明,出口宽度增大不但减小了涡量,还改变了涡流方向。出口宽度增大到2.5倍入口直径时,孔中心下游冷气流线由燃气指向壁面,有效改进冷气贴附性。气膜孔出口宽度越大,冷却效率越大。随着吹风比的增加,气膜孔出口宽度对冷却效率影响越明显。
The numerical simulation of the film cooling efficiency of fan-shaped jets with different exit widths at different blowing ratios focuses on the analysis of the influence of eddy structure and vorticity on the cooling efficiency. The results show that the increase of outlet width not only reduces the vorticity, but also changes the direction of vortex flow. When the outlet width is increased to 2.5 times the inlet diameter, the flow line of cool air downstream of the center of the hole is directed to the wall by gas to effectively improve the air-conditioning adhesiveness. The larger the outlet diameter of the film hole, the greater the cooling efficiency. With the increase of blowing ratio, the influence of the outlet width of the film hole on the cooling efficiency is more obvious.
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