Influence of Turbulence Models on the Flow Field Simulation of Annular Jet Pump
To reflect the influence of intense momentum exchange of the fluid in the annular jet pump suction chamber accurately,a comparison calculation using different turbulence models and wall functions was conducted,and hydraulic experiments were carried out to verify the results. The results showed that different wall functions had little effect on the performance and wall pressure coefficient calculation of the annular jet pump. Compared to the RNG k-ε (RNG),Standard k-ω (SKW),SST k-ω (SST)models,the results calculated using the Realizable k-ε (RKE) model or Reynolds stress model (RSM) combined with the scalable wall function (ScWF) was more con-sistent with the measurements. By comparing the simulated flow field,it was found that the performance prediction results of different turbulence models with low flow ratio conditions were related to the distribution range of the recir-culation zone simulated. The larger the range of the recirculation zone simulated,the lower the predicted perform-ance of the annular jet pump had. Based on the analysis of entropy production theory,it was believed that the ener-gy loss of the annular jet pump was mainly caused by the turbulent entropy production distributed in the wall and the mixed shear layer. With high flow rate conditions,the high turbulent entropy production rate calculated by the RSM model was the main reason for its lower prediction performance compared to the RKE model.
annular jet pumpturbulence modelperformancerecirculation zoneentropy production theory
万方数据
维普
