Aerodynamic Performance Analysis of Low Pressure Cylinder in Deep Peaking Operation of Steam Turbine
The study found,there are some risks in low-pressure cylinder of steam turbine in low-load operation,such as steam flow excitation,blade blowing,dynamic and static friction,and blade water erosion.To solve this technical problem,in this paper,the numerical verification method is used,the aerodynamic performance of low pressure cylinder under different load conditions was calculated,the characteristics of blast heating and the distribution of temperature field in the last and second last stages of low pressure cylinder are studied.The results of the study,low-pressure cylinder when load is reduced to 40%THA,the vortex of separation begins to appear,nearly half of the last stage blade is in the state of blast heating;As the load decreases,the swirl is stretched,to 20%THA load the reflux vortex nearly blocks the entire flow passage,the entire last stage rotor enters the blast heating state.In order to reduce the pressure cylinder blast loss when the load is deeply adjusted,need to select the last stage short blade in the design and transformation,and in the process of operation to reduce the unit back pressure.
depth peak shavingflow field of low pressure cylinderaerodynamic performanceseparation vorticesthe blast is heated
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