To study the effect of different turbulence models and related wall boundary treatment methods on the simulation of the performance and internal flow field of a jet pump, and to find their good combination, six turbulence models (namely, three k-ε models, standard and SST k-ω models and Reynolds stress models) and two wall treatment methods (standard wall functions and enhanced wall treatment) were combined in different ways. Standard wall functions and enhanced wall treatment were respectively applied to three k-ε models and RSM model. Both k-ω models were used as lowReynoldsnumber models without applying any wall treatment methods. Ten combinations were thus obtained. The data of the performance and the static wall pressure distribution of a jet pump were employed as the criteria to validate the simulation results. The results show that all the ten combinations agree well with the experiment data when the volumetric flow ratio is relatively low, and all simulation errors of the ten combinations are greater than 10% when working at relatively high flow ratio. After adjusting constants of the turbulent model, for some combinations, the difference between the errors of the predicted results and the experiment data were lowered to be less than 5%. The model constant C2ε has a greater influence than σε on the calculation; and the maximum turbulence energy decreases as C2ε or σε decreases, but the distribution region of turbulence energy expands correspondingly.
YANG Xue-Long,LONG Xin-Ping,XIAO Long-Zhou et al. Influence of different turbulence models on simulation of internal flow field of jet pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(2): 98-102.
Narabayashi T, Yamazaki Y, Kobayashi H, et al. Flow analysis for single and multinozzle jet pump [J]. JSME International Journal Series B: Fluids and Thermal Engineering, 2006, 49(4):933-940.
Long Xinping, Han Ning, Cheng Qian. Influence of nozzle exit tip thickness on the performance and flow field of jet pump[J].Journal of Mechanical Science and Technology， 2008, 22(10): 1959-1965.
Long Xinping, Yao Xin, Yang Xuelong. Flow simulation and vortex structure analysis of multinozzle jet pumps[J]. Journal of Drainage and Irrigation Machinery Engineering, 2012,30(2):136-140,152. (in Chinese)
Elhayek M D, Hammoud A H. Prediction of liquid jet pump performance using computational fluid dynamics[C]／／Proceedings of the 4th WSEAS International Conference on Fluid Mechanics and Aerodynamics. Elounda, Greece:[s.n.], 2006:148-153.
Pope S B. Turbulent Flows ［M］. Cambridge: Cambridge University Press, 2000.