基于多参数的层板综合冷却效率实验研究及试验验证

Experimental Investigation and Verification on Overall Cooling Effectiveness of Lamilloy Based on Multi-Parameter

关键词:  层板  综合冷却效率  预测模型  多参数耦合影响  试验验证

Key words:  Lamilloy  Overall cooling effectiveness  Prediction model  Multi-parameter coupling effect  Experimental verification

摘要:

采用正交实验设计方法，研究了冲击孔直径、扰流柱直径、气膜孔直径、冲击高度、轴向间距、展向间距和吹风比对层板综合冷却效率的耦合影响。研究结果表明：气膜孔直径、展向间距和轴向间距是综合冷却效率的主要结构影响因素，综合冷却效率随气膜孔直径增大而增大，随展向间距和轴向间距增大而减小，相同开孔率时减小展向间距比减小轴向间距更有利于提高综合冷却效率；随着吹风比增大，综合冷却效率先快速后缓慢增大；根据实验结果拟合了层板综合冷却效率模型，拟合误差在±5%以内，经主燃烧室全环试验件高温高压试验验证，该模型预测的综合冷却效率最大误差为5.86%。

Abstract:

The effects of impinging-hole diameter， pin-fin diameter， film-hole diameter， impinging height，axis spacing，span-wise spacing and blowing ratio on the overall cooling effectiveness of the lamilloy were studied by design of experiments. The results indicated that， the film-hole diameter，span-wise spacing and axis spacing are the main structural parameters affecting the overall cooling effectiveness. The overall cooling effectiveness increases with the increase of film-hole diameter and decreases with the increase of span-wise spacing and axis spacing. Reducing the span-wise spacing is more conductive to improving the overall cooling effectiveness than reducing the axis spacing at the same fractional hole area. With the increase of blowing ratio， the overall cooling effectiveness increases rapidly at first and then slowly. According to the experimental results， the overall cooling effectiveness model of lamilloy is fitted， and the fitting error is within ±5%. The maximum error of the overall cooling effectiveness predicted by the model is 5.86%，which is verified by the full-ring combustor test rig under high temperature and high pressure conditions.