这一过程有一个另外的好处，就是不必为火箭发动机建造一个点火系统。

This provides the added advantage of not having to build an ignition system into the rocket.

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然后，火箭发动机点火启动，飞船提速达到3倍音速，升入地球的大气层上空。

Then the Enterprise's rocket motors will ignite, accelerating the ship to three times the speed of sound, taking it up over the Earth's atmosphere.

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本文采用理论分析和数值仿真方法对大长径比固体火箭发动机点火瞬态过程进行了系统研究。

This dissertation integrates theoretical analysis and numerical simulation method to investigate the ignition transient process of large aspect ratio solid rocket motors.

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