进口热斑径向作用位置对无导叶对转涡轮低压级温度场的影响

EFFECTS OF RADIAL LOCATION OF INLET HOT STREAK ON TEMPERATURE DISTRIBUTION IN LOW PRESSURE STAGE OF A VANELESS COUNTER-ROTATING TURBINE

为了探究无导叶对转涡轮进口热斑径向作用位置的变化对其低压级温度场的影响,运用CFD方法对某无导叶对转涡轮模型级的流场进行了三维非定常多叶片排的数值模拟。结果表明,进入低压动叶中的热斑流体的迁移特性主要由通道二次流控制;进口热斑径向作用位置的变化将直接影响到低压动叶中的通道二次流结构,转了通道中的二次流与涡轮进口热斑直接相关;进口热斑径向作用位置的变化将对低压动叶吸力面上的附加高温区的强度产生显著影响。

In this paper, three-dimensional multiblade row unsteady Navier-Stokes simulations have been performed to reveal the effects of radial location of inlet hot streak on temperature distribution in low pressure stage of a Vaneless Counter-Rotating Turbine （VCRT）. Hot streaks on 25% span, 50% span and 75% span are introduced at the turbine inlet. The numerical results indicate that the secondary flow effect is the mainly influencing factors to directly affect the migration characteristics of the hot streaks in the low pressure turbine （LPT） rotor. The radial location of inlet hot streak will affect the configuration of the secondary flow in the LPT rotor. The passage secondary flow in the LPT rotor is directly related to the inlet hot streak. And the predicted results also show that the radial location of inlet hot streak will take an effect on the strength of the additional high temperature region on the suction surface of the LPT rotor.