Investigation on the flow field regulation characteristics of the right-angled channel by impinging disturbance method

Abstract

The right-angled constrained channel with square-section is a typical channel configuration in many engineering fields. However, due to the high curvature of the right-angled constrained channel, the flow field parameters are not uniformly distributed, which has an adverse effect on resource utilization or reaction efficiency of the industrial process. To address the above matters, the modeling and solving method for impinging disturbance-based flow field regulation are proposed to regulate the flow field distribution. According to the design criteria of the disturbance channel, a numerical model of impinging disturbance is set up based on the mixture multiphase model and realizable $k-\epsilon$ turbulence model. And the pressure–velocity coupling solution strategies are conducted to quickly solve the impinging disturbance mechanism. The distribution law of the flow field parameters at different disturbance velocities is obtained to reveal the turbulence variation mechanism caused by impinging disturbance. These research results show that the disturbance vortex produced by the collision between the disturbance flow and the mainstream can affect the parameter distribution characteristics of the flow field in the constrained channel together with the backflow vortex, dean vortex, and the secondary vortex. The disturbance flow can effectively interfere with or control the vortex structure and indirectly regulate the flow field parameters to improve uniformity and energy utilization by actively regulating the disturbance velocity.