A performance prediction model is established in this paper which taking ac count into gas compressibility and the change of cross section area of flow channel.

本文建立的性能预测模型考虑了气相的可压缩性和沿流道的截面面积的变化，介绍了数值模拟的方法和步骤。

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Control valve is a pipe attachment, which is used to change the channel cross-section and flow direction, the control flow of a medium transport device.

调节阀是一种管路附件，它是用来改变通路断面和介质流动方向，控制输送介质流动的一种装置。

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The calculation methods for overbank flow in straight channel and meandering channel with compound cross section are studied respectively.

对复式顺直河道和复式游荡型河道中漫滩洪水的计算方法进行了研究。

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