Experimental investigation on overall heating effect of aero-engine inlet cone
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摘要:
为了研究不同气流参数对发动机进口帽罩综合加热效果的影响,采用红外成像测温技术对帽罩全表面综合加热效率进行了测量,并详细分析了实验帽罩在二次流吹风比为0.8~3.0、温比为1.2~1.6和主流雷诺数为
8600 ~17000 条件下的综合加热效果。实验结果表明:在内部冲击和外部气膜的共同作用下,帽罩前缘具有较高的加热效率,约为0.5;在实验条件下,提高二次流热气的吹风比能够有效地增强帽罩全表面的加热效果,当吹风比由0.8增大到2.0,综合加热效率平均提高33%;二次流温度的提高,对帽罩前缘加热效果影响较小,综合加热效率增幅只有0.01左右;随着主流雷诺数增加,帽罩中后部的综合加热效率明显降低。Abstract:In order to study the influence of flow parameters on overall heating effect of aero-engine inlet cone, the comprehensive heating efficiency on cone surface was measured by infrared temperature measurement technology. The overall heating effect of experimental cone was analyzed in detail under the conditions that the secondary flow blowing ratio was within the range of 0.8—3.0, the temperature ratio was from 1.2 to 1.6, and the mainstream Reynolds number was from
8600 to17000 . The experimental results showed that both internal heat transfer and external film heating caused a high heating efficiency at the leading edge, which was about 0.5. Under experimental conditions, improving blowing ratio can bring better heating effect of the full cone surface. The increase of the blowing ratio from 0.8 to 2.0 can result in a gain of about 33% for the heating effect. The increase of secondary flow temperature can increase the heating effect of leading edge slightly by about 0.01 in comprehensive heating efficiency. The increase of mainstream Reynolds number can decrease the heating effect of the middle and rear parts for the cone.-
Key words:
- infrared thermal imaging test temperature /
- cone /
- anti-icing /
- heating effect /
- blowing ratio
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