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采用计算流体力学商用Fluent软件,对某百万千瓦超超临界汽轮机主调阀系统(主汽阀和调节汽阀组成的进汽系统)正常运行时的蒸汽稳态流场和快速关闭时的非稳态流场进行了全三维数值计算及分析.结果表明:稳定工作状态下,阀门全开时的阀组总压损失约为进口总压的1.23%,其中调节汽阀损失占总损失的57.52%;主汽阀、调节汽阀都为快开特性的阀,它们的相对升程大于30%时流量基本不可调.采用Fluent中的动网格技术,计算分析了调节汽阀从全开到快速关闭的非稳态过程中蒸汽的流动特性,并给出了调节汽阀快速关闭时的行程、流量及阀后压力与关闭时间的动态曲线.
A commercial CFD software Fluent was used to simulate the steam steady-state flow field and the non-steady-state flow during the normal operation of a million-kilowatt ultra-supercritical steam turbine main valve system (main steam valve and steam regulating valve) The steady-state flow field has been calculated and analyzed in full three-dimensional numerical results.The results show that the total pressure loss of the valve when the valve is fully open is about 1.23% of the total inlet pressure, and the loss of the regulating valve accounts for 57.52% of the total loss %; The main steam valve, regulating valve are quick opening characteristics of the valve, their relative lift greater than 30% of the flow is not adjustable. Using Fluent moving grid technology, calculated and analyzed from the full throttle valve The steam flow characteristics during fast shut-down and the dynamic curves of the flow, the pressure after the valve and the shut-off time when the steam valve closes rapidly are given.