The performance characteristics of back-pressure radial inflow turbines(RIT)vary with the in-let pressures.It is required that for optimization purposes,the designers can not only simulate the overall per-formances,but also understand the reason behind.To solve this scientific problem,this paper with the help of a high-speed radial turbine,which was simulated with a single-passage model and steady state numerical meth-ods.Under various inlet total pressures,the performance curves of efficiency and massflow were calculated.The loss mechanisms were then analyzed with the help of loss models and the calculated flow fields.It is found that the rotor inlet incidence deviates greatly at low pressure,and the incidence loss can be nearly 40%more than that at design point.With the increase of pressure,the incidence gradually stabilizes within the appropriate range,and the passage secondary flow loss and exit energy loss begin to increase in a larger ratio,and the exit energy loss can exceed the design point condition by about 5 times under high pressure conditions.
关键词
汽轮机/向心透平/攻角/损失模型/变工况/数值仿真
Key words
steam turbine/radial-inflow turbine/angle of attack/loss mode/variable operating conditions/numerical simulation
维普
万方数据