... force through ram pressure 冲压 ram pressure ratio 冲压比 ram-type pressure multiplier 柱塞式压力倍增器 ...
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超燃冲压发动机以其高速、高比冲和工作范围宽广的特点，正逐渐成为当今航空航天动力领域的研究焦点。
The scramjet has some advantages of high flow velocity, high specific impulse and wide operating range which become a viewpoint in the research field of power of Aeronautics and Astronautics.
采用变压边力可以明显提高板材的冲压性能，极限拉深比将达到5.0。
Using variable blank holder force can remarkably improve the forming performance, and the limiting drawing ratio would reach 5.0.
实验结果表明，冲压室燃烧效率比采用音速(或超音速)单喷管时提高30%左右。
The secondary combustion efficiency with this type of nozzles was increased by about 30% than that with single sonic (or supersonic) rocket nozzles.
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