工程科学与技术 (Nov 2024)
Analysis of Mixing Performance of Impinging Stream Reactor Enhanced by Vortex Generator Based on Field Synergy Theory
Abstract
The flow field characteristics and mixing characteristics of an impinging stream reactor equipped with a rectangular wing vortex generator are analyzed using the numerical simulation method to improve the mixing performance of an impinging stream reactor. The parameters of the rectangular wing vortex generator are optimized. The effects of size and position parameters of the rectangular wing vortex generator on the mixing strength of the impinging stream reactor and the effects of position parameters on velocity distribution and turbulent kinetic energy distribution in the reactor are investigated. The mass transfer field synergy principle is applied to analyze the synergy between velocity and concentration fields in the impinging stream reactor, both with and without the rectangular wing vortex generators. The results showed that the mixing strength initially increases and decreases with rising radial spacing, r. The mixing strength fluctuation changes as the wing width, h, rotor spacing, d, and attack angle, β, increase gradually. When the wing width h = 10 mm, rotor spacing d = 8 mm, radial spacing r = 30 mm, and attack angle β = 30° for the rectangular wing vortex generator, the mixing strength in the reactor is at its highest, and the mixing effect is optimal. Under conditions of full impact from two flows, the velocity distribution in the radial jet region of the impinging flow reactor follows a "bimodal" distribution pattern. Adjusting the vortex generator position parameters improves the radial velocity, with the highest radial velocity occurring when the axial spacing d = 8 mm and the attack angle β = 30°. The turbulent kinetic energy distribution in the radial jet region of the reactor exhibits a “single-peak” distribution, although changes in the vortex generator position parameters have minimal effect on the turbulent kinetic energy distribution. From the perspective of field synergy, adding a rectangular wing vortex generator alters the magnitude and direction of the radial jet velocity in the impinging stream reactor. As a result, the synergy between the velocity and concentration fields improves, enhancing the mixing performance of the impinging stream reactor.
