搜索 - 科创

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你说的是燃烧室燃气的的过（度）膨胀吧，喷管扩张段的过膨胀指的是喷管设计的不合理（一般而言），导致减少可能产生的推力，负推力导致的结构问题只有扩张比，推力都很大（比如大型的液体火箭发动机）的情况下影响才会非常明显

金属发动机的耐压很强，特别是纯钛的，可以得到非常强的推力。并且，我不同意你说推重比小，钢制的发动机工作1.2秒左右（举个例尺寸不详细说了）推力有30KG但是整个发动机的重量不足1KG还低吗。

这两个概念有些许差别，如果喷管是欠膨胀的，那么喷管的出口截面就会对外界有一个静压力，这个压力会反映到推力上，而以这个推力计算排气速度的话结果就会比真实的排气速度高，因为会把静压力产生的推力换算成由排气产生的推力

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