为对比蒸汽和空气在转静盘腔中的瞬态响应特性，建立了转静盘腔数值计算模型，基于用户自定义函数编程编写了非稳态边界条件，通过CFD非稳态数值模拟方法研究了进口压力以阶跃函数和斜坡函数变化时蒸汽和空气流动的瞬态响应特性。研究表明：蒸汽的瞬态响应特性明显优于空气；同一无量纲跃升幅值下，两种介质瞬态响应过程的总体趋势基本相同；当无量纲跃升幅值由1.05增至1.25时，蒸汽总温的超调量比空气平均低45.9%；斜坡时间由0.025 s增至0.16 s时，蒸汽总温的超调量比空气平均低39.4%；对于同一流动参数，蒸汽的响应时间要明显少于空气。

To compare the transient response characteristics of steam and air in the rotor-stator cavity,a CFD model of rotor-stator cavity was established with the boundary conditions defined by user defined function,and the unsteady numerical simulation method based on CFD was used to investigate the transient response characteristics of the rotorstator cavity where the inlet pressure was changed by the step function and the ramp function by steam and air flow.The results show that the transient response characteristics of steam flow in the rotor-stator cavity are significantly better than those of air.The general tendency of the transient response of air flow is fundamentally the same as steam flow under the same dimensionless step coefficient of the step function.When the dimensionless step coefficient increases from 1.05 to 1.25,the overshoot of total temperature in steam flow is 45.9% lower than the average value of air flow,and is 39.4% lower than air flow with the ramp time of ramp function increasing from 0.025 s to 0.16 s.The response time by steam flow is significantly less than air flow for the same flow parameters.

TK221

南京航空航天大学研究生创新基地（实验室）开放基金项目（kfjj20170204）