孔内“喷射现象”影响气膜冷却流动传热机理

姜玉廷; 林洪飞; 岳国强; 向世建; 郑群

doi:10.13224/j.cnki.jasp.2018.02.023

孔内“喷射现象”影响气膜冷却流动传热机理

doi: 10.13224/j.cnki.jasp.2018.02.023

哈尔滨工程大学动力与能源工程学院,哈尔滨 150001

基金项目: 黑龙江省自然科学基金（QC2017047）; 中央高校基本科研业务费专项基金（HEUCFJ170303）

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出版历程
- 收稿日期: 2016-07-16
- 刊出日期: 2018-02-28

Flow and heat transfer mechanism of film cooling influenced by “jet phenomenon” in film hole

摘要

摘要: 为了揭示气膜孔内不同“喷射现象”对气膜冷却流动传热的影响,在相同射流角基础上选取7种不同进气角的冷气腔以改变气膜孔内的“射流效应”,并对7种冷气腔在不同吹风比条件下进行了对比研究。结果表明：当进气角不为0°时,不同进气角会在气膜孔内产生不同的“喷射现象”。低吹风比时不同进气角的气膜冷却效率相差不大。随着吹风比的增加,不同进气角时的冷却效率存在很大差别。在吹风比为1.5,进气角不大于0°时冷气在孔外形成了强肾形涡；而当进气角大于0°时冷气在与高温主流相互作用后,上游低动量区的冷气会绕开下游高动量区冷气后贴附壁面,增大涡对之间的距离从而减弱相互增强的效应。相对于原始冷气腔,在吹风比为1.5，进气角为15°和30°时的平均气膜效率分别提高了约130%和70%。
- 气膜冷却 /
- 喷射现象 /
- 绝热气膜冷却效率 /
- 肾形涡 /
- 冷气腔
Abstract: In order to reveal the flow and heat transfer mechanism of film cooling influenced by “jet phenomenon” in film hole, seven cooling air ducts with different inlet angles were chosen to conduct a comparative study with different blowing ratios, and induce the “injection phenomenon” in film cooling hole under the conditions of the same injection angle. Results showed that the “injection phenomenon” in film cooling hole only occurred at different inlet angles when the inlet angle was not equal to 0°. At low blowing ratio, obvious influence on adiabatic cooling effectiveness wasn't observed with different inlet angles. With the increase of blowing ratio, the cooling effectiveness was different when the inlet angles were different. When the blowing ratio was 1.5 and the inlet angle was not more than 0°, strong kidney vortex was formed outside the film cooling hole, causing a low cooling effectiveness; when the inlet angle was more than 0°, the coolant in this region interacted with high temperature mainstream, and the cooling air in the low momentum region of upstream could bypasses the large downstream jet momentum coolant to attach cooling surface. This increased the distance between the vortexes to weaken mutually reinforcing effect. Compared with the original cooling air duct, when the inlet angles were 15° and 30°, the average adiabatic film cooling effectiveness was increased by 130% and 70% when the blowing ratio was 1.5.
- film cooling /
- jet phenomenon /
- adiabatic film cooling effectiveness /
- kidney vortex /
- cooling air duct

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