Research on the Influence of Turbulence Model on the Flow Field Characteristics of Rotating Valve

In order to study the fluid flow characteristics of the key components in hydraulic excited rotary valve,and then determine the area where the vortex and negative pressure to find the weak link in th e structure and analyze the performance of the valve. Simulate the flow field in the rotary valve by Fluent fluid analysis software, and setting different opening degrees under the same boundary condi tions. Studies showed that the velocity at the exit junction of the fluid in the rotary valve, and the vortex degree of pressure is large at the oil groove. When the opening degree is small, the nega tive pressure is large, the vortex is obvious. With the opening becomes large, and the negative pressure and the vortex are improved. The research provides a theoretical basis for the optimization and improvement of the rotary valve. Studies have shown: The velocity of the flow channel calculated under the turbulence RNG k − ε model is the largest, Realizable. The velocity of the flow channel calculated under the model is the smallest. For different models, the values of the low speed region are different, where Realizable k − ε Minimum model speed, The RNG k − ε model has the highest speed and standard. The speed of the k − ε model is in the middle; The high speed area is mainly concentrated in the corner area of the oil tank and valve mouth, The area of high speed area of the RNG k − ε model is smaller than that of the other two models, and the standard of the model is smaller than that of the other two models. The k − ε Model and the Realizable k − ε is no significant difference in the area of high speed area calculated by the model. The comparison draws the following conclusions: The results of the turbulence RNG k − ε model and the other two groups of models are more accurate when calculating the low velocity flow field. The Realizable k − ε Model and the RNG k − ε has the calculation results of the model are similar.