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实验证明冲压火箭发动机的飞行性能不仅与固体燃气发生器的燃烧性能有关， 而且与吸入空气流量有很大关系， 因此其性能最终取决于飞行速度与高度。以燃料的燃气流量与空气的混合比为参数， 求出了喷管截面积与进气口截面积的关系。明确了增加射程的条件与飞行速度的关系随飞行高度而变化
Experiments show that the performance of the ramjet is not only related to the combustion performance of the solid gas generator, but also has a great relationship with the intake air flow rate. Therefore, its performance ultimately depends on the flight speed and altitude. The relationship between the cross-sectional area of the nozzle and the cross-sectional area of the air intake was obtained by taking the mixing ratio of fuel gas flow rate and air as the parameter. It is clear that the relationship between the conditions for increasing the range and flight speed varies with the flight altitude