本文利用一条等熵参考线和两个等焓偏导数建立了火箭发动机性能参数的外推公式。

In this paper, the extrapolation formulas of rocket engine performance parameters are established utilizing one isentropic reference line and two partial derivatives for fixed enthalpy.

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导数是振动熵的特例。

Derivative is a special case of vibration - entropy.

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二阶导数给出熵，随着变量变化的情况，这些变量包括压强或者体积。

Then the second derivative gives the change in entropy with respect to the variable that we're differentiating, with respect to which is either pressure or volume.

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二阶导数给出熵，随着变量变化的情况，这些变量包括压强或者体积。

Then the second derivative gives the change in entropy with respect to the variable that we're differentiating, with respect to which is either pressure or volume.

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