Numerical simulation of submerged impinging water jet at different impact angles
CHEN Xinxin1, WANG Chuan2*, SHI Weidong1,3, ZHANG Yingchong1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 3. School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China
Abstract：Numerical simulations of fully developed submerged impinging water jet were carried out by using the commercial CFD software ANSYS Fluent with the Wray-Agarwal(W-A)turbulence model to investigate the influence of impact angle on the jet flow field.The structure and velocity distribution of the flow field with a constant jet-to-plane distance H/D=3 and different impact angles(15°≤θ≤90°)were studied. A comparison was made between the numerical results and the experimental data obtained with PIV, then the reliability of the W-A turbulence model was validated, furthermore, the influence of impinging angle on the computational results was discussed. The results show that the impinging jet axial velocity V/Vb remains unchanged basically in the potential core region, decreases in the transition region, and drops off at an acceleration in the impact zone. The jet flow changes direction and diffuses along the wall in the near wall region.The jet flow field is largely dependent on the impact angle θ. With increasing θ, the horizontal diffusion of the jet is deteriorated and the thickness is thinned.At θ=90°, the stagnation point and the point of transition in the flow direction coincid with the impact origin. The stagnation point gradually moves away from the impact origin with decreasing θ, and it disappears at θ<30°.
