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汉语拼音：dìng cháng liú dòng

流体（气体、液体）流动时，若流体中任何一点的压力，速度和密度等物理量都不随时间变化，则这种流动就称为定常流动，也可称之为“稳态流动”或者“恒定流动”；反之，只要压力，速度和密度中任意一个物理量随时间而变化，流体就是作非定常流动或者说流体作时变流动。

• The pentahedral bicharacteristic curve grid can be applied to investigate the thrust misalignment characteristics in a unsteady flow.

  证明五面体双特徵曲线网格方法可用来研究非定常流动条件下的推力偏心特性。

• Unsteady cavitating flow around a disc cavitation and its drag characteristics were studied numerically using the filter-based model(FBM).

  应用基于滤波器的湍流模型（FBM）对绕圆盘空化器空化非定常流动和阻力特性进行了数值计算和分析。

• Working on this project will open a new road to explore the potential of unsteady flow.

  对此方向的深入研究，对于进一步挖掘叶轮机非定常流动的潜力开辟一条新的道路。

• The finite element method of rotary Couette Poiseuille flow in annular gap of rotary tubular membrane separator was discussed in this paper.

  讨论了旋转管式膜器环隙间定常流动的有限元解法。

• Based on the renormalization group analysis model and the SIMPLEC algorithm, the steady flows in a typical rectangular sump were simulated.

  首先基于重整化群湍流模型和SIMPLEC算法，数值模拟了泵站典型矩形进水池内的定常流动；

• Wave resonance and energy loss of inlet pipe were analyzed first and one dimension numerical simulation of unsteady flow was studied.

  首先研究了进气管中气流运动的波动效应和能量损失以及进气过程中一维非定常流动的数值解法。

• the base frequency of the flow in the vaned diffuser decreases under the IGV prewhirl.

  扩压器内部的非定常流动的基本频率降低。

• Exact solutions for the unsteady flow of generalized second grade fluid over a flat plate

  广义二阶流体平板不定常流动的解析解

• Numerical study of the unsteady flow in a plane compressor cascade

  平面压气机叶栅非定常流动的数值研究