Investigation on Transient Response Characteristics of Flow of Rotor-Stator Cavity

The unsteady flow of the aero-engine rotor-stator cavity as the research object, the unsteady boundary conditions were set when the inlet pressure changes followed the ramp function were programmed based on the user-defined function programming. The unsteady state numerical simulation was carried out to investigate the transient response characteristics of rotor-stator cavity under different dimensionless jump coefficient, which was within the perspective of the hysteresis effect, flow field evolution and physical properties. The results show that the local response time inside the disk cavity is extended by 81.1%, the overshoot of the relative total temperature increased by 157.0%, the peak time increased by 31.3% when the dimensionless jump amplitude increases from 1.05 to 1.2. The propagation direction of the undulation of inlet is always from the inlet to the outlet. In the transient process, the combination effect of the volumetric and rotational effects of rotor-stator cavity causes the outlet flow to significantly lag behind the inlet flow, and the overshoot of relative total temperature is closely related to the mass flow storage in cavity. The impinging jet, the rotating adhering jet and the vortex on the side of the stator wall constitute the main body of the evolution of the disk cavity flow field, and the larger the dimensionless jump coefficient, the more intense the flow field evolution process, and the longer the response time is. The response speed is closely related to the sonic speed and the thermal diffusivity. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.