核電汽輪機級內濕蒸汽凝結流動的特性分析
[Abstract]:Most of the nuclear turbine units operate in wet steam state, so it is of great practical significance to understand the mechanism of spontaneous condensation flow of wet steam in order to improve the economy and safety of nuclear power turbine units. In this paper, the three-dimensional numerical analysis of wet steam spontaneous condensation flow in high pressure cylinder stage of 600MW nuclear power turbine is carried out by using the non-equilibrium phase transition model of wet steam spontaneous condensation. The main work contents are as follows: the spontaneous condensation flow of wet steam in different steam states and different working conditions under steady flow conditions is analyzed. The results show that the total pressure on the axial distance of the blade changes suddenly when the steam condenses spontaneously. Under different steam conditions, the condensation amount of supercooled steam is the largest, and the dynamic pressure value is the highest. Along the direction of leaf height, condensation first occurs in the upper part of the blade. With the decrease of inlet mass flow rate, the flow loss in stage increases and the efficiency of steam turbine decreases. With the increase of steam inflow humidity, the aerodynamic performance of the stage flow field becomes worse and the efficiency of the stage decreases. Numerical analysis of spontaneous condensation flow of wet steam is carried out under the condition of unstable flow. The results show that the axial power in the wet steam stage decreases by 0.266% due to the static and static interference of the unsteady flow. The phenomenon of static blade wake in the process of unstable flow increases the diameter of spontaneous condensation droplets in the downstream moving blade channel and the number of droplets in the leading edge of the moving blade. The average pressure at the outlet of the moving blade is increased by the pressure potential of the unstable condensate flow. The wet steam loss of wet steam condensation caused by unstable flow is increased by 19.917%. In this paper, the study of spontaneous condensation flow of high pressure stage wet steam in a nuclear power turbine is helpful to improve the economy and safety of the unit and provide a theoretical basis for the actual operation of nuclear power turbine.
【學位授予單位】:東北電力大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM623
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