由于冲击式水轮机三维自由射流是两相流，进行瞬态计算的时间步长必须非常小，这就需要大量的计算资源。
The time step is very small for the transient analysis of nozzle jet flow, which occupied numerous computational resources.
还包括数学模型方程的计算机辅助管理系统的瞬态特性。
The mathematical model also includes equations for computer-assisted management systems transient characteristics.
本文针对汽轮机转子的脆化现象，运用有限元方法对引进型300 MW汽轮机冷态启动过程的高中压转子瞬态温度场进行了分析计算。
To the embrittlement phenomenon of steam turbine rotor, this thesis calculated 300mw steam turbine rotor's transient temperature field of cold start-up using FEA method.
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