带等宽度平直斜楔的非对称来流短隔离段实验

为了提高超燃冲压发动机隔离段耐反压能力以及缩短隔离段长度,设计了一种带等宽度平直斜楔的隔离段,斜楔放置在隔离段进口下壁面厚附面层一侧,在Ma=1.98非对称的隔离段进口来流条件下完成吹风实验.实验结果表明,隔离段加等宽度平直斜楔后可在相同的反压下使激波串相对长度从13.87缩短至11.12,比基准隔离段激波串长度缩短了19.8%.同样的隔离段加斜楔后能够承受的最大反压从来流静压的3.55倍上升到3.85倍,提高了8.45%左右.

Experimental investigation of short isolator with a full ramp under asymmetric incoming flow

An isolator with a full ramp was designed to improve the performance of the isolator or to reduce the length of the isolator.The ramp was placed on the lower wall at the isolator entrance.Experiment was conducted in Mach 1.98 at the isolator entrance.Experimental results indicate that,the length of the shock train is reduced by 19.8 percent for the rectangular isolator with the full ramp.The length of shock train in the isolator without a ramp is 13.87 times the height of the isolator entrance,but the length of shock train in the isolator with the full ramp is reduced to 11.12 times the height of the isolator entrance under the same back-pressure cases.The maximum back-pressure is improved by 8.45 percent for the isolator with a ramp which can withstand a maximum back-pressure of 3.85 times static pressure,but the isolator without a ramp could only withstand a maximum back-pressure of 3.55 times static pressure.