对已有流体机械逆求其流道曲线，由于不知道性能参数无法直接用伯努里方程；

To find the passage curve for a given fluid machine, the parameters in the equation are unknown.

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结合伯努里方程和临界牵引力理论，得到了基于临界速度的临界水力梯度公式；

Coupling the Bernoulli's equation and critical tractive stress theory, a critical hydraulic gradient model based on critical velocity is developed.

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本文针对在实际使用过程中可能出现的问题，应用水压图及伯努里方程，对应用水射器补水加压的热水供暖系统水力工况、吸上真空度等进行了分析和计算。

The hydrodynamic condition and the sucking vacuum that may ap- pear in such a system are further analyzed and calculated here by means of the water pressure chart and the Bernoulli equation.

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