| 刘海涌，牛嘉嘉，刘存良，王 睿.开孔率对加力燃烧室隔热屏冷却特性的影响[J].航空发动机,2022,48(6):64-70 |
| 开孔率对加力燃烧室隔热屏冷却特性的影响 |
| Influence of Open Area on Cooling Characteristics of Afterburner Liner |
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| DOI： |
| 中文关键词: 加力燃烧室 隔热屏 冲击发散冷却 流量系数 综合冷却效率 开孔率 吹风比 航空发动机 |
| 英文关键词:afterburner liner impingement/ effusion cooling discharge coefficient overall cooling effectiveness open area blow⁃
ing ratio aeroengine |
| 基金项目:中央高校基本科研业务费专项资金（3102018zy019）资助 |
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| 中文摘要: |
| 为了分析开孔率对航空发动机加力燃烧室隔热屏流动和冷却特性的影响，建立了双层壁隔热屏结构。在给定冲击距、
发散板与冲击板开孔面积比的条件下，对开孔率为0.6%和0.8%的冲击发散冷却结构进行数值模拟，获得了发动机真实工作状态
下的气动参数、几何参数对流量系数和综合冷却效率的影响规律。结果表明：冲击孔、发散孔流量系数沿主流方向略微增大，随着
开孔率由0.6%增大到0.8%，不同吹风比下冲击孔的流量系数均减小，而气膜孔的流量系数变化不明显，在吹风比由0.2增加到0.8
时，0.6%开孔率结构的综合流量系数增幅明显高于0.8%的；在吹风比为0.2时，0.6%开孔率结构上游区综合冷效优于0.8%开孔率
结构的，而在下游区则正好相反，在吹风比为0.3～0.8时，0.8%开孔率结构各区域的综合冷效均高于0.6%开孔率结构的。 |
| 英文摘要: |
| In order to study the influence of open area on the flow and cooling characteristics of the aeroengine afterburner liner，a
double-wall liner structure was established. Under the real engine operating conditions，with given gap distance and the ratio of the open
area of the film plate and the impingement plate，numerical simulations of the impingement/film cooling structure with open area of 0.6%
and 0.8% were carried out. The influence of flow and geometric parameters on discharge coefficient and overall film cooling effectiveness
was obtained. The results show that the discharge coefficients of the impingement holes and film holes increase slightly along the main?
stream. As the open area increases from 0.6% to 0.8%，the discharge coefficients of the impingement holes decrease under different blow?
ing ratios，but the discharge coefficients of the film holes have no significant change. When the blowing ratio is increased from 0.2 to 0.8，
the gain of the comprehensive discharge coefficient of the structure with 0.6% open area is significantly higher than that of the structure
with 0.8% open area. When the blowing ratio is 0.2，The overall cooling effectiveness of the upstream area of the structure with 0.6% Open
area is better than that of the corresponding area of the structure with 0.8% open area，but it is the opposite for the downstream area. When
the blowing ratio is 0.3 to 0.8，the overall cooling effectiveness of each area of the structure with 0.8% open area is higher than the corre?
sponding area of the structure with 0.6% open area. |
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