Numerical simulation and model experiment method were combined to research the tubed vortex reducer

and the influences of the tube length on the pressure loss coefficient

temperature reduction coefficient and their weights between each section were analyzed. Model experiment results verified the reliability of numerical simulation method. The results showed that increasing the tube length can reduce the pressure loss obviously and increase the temperature reduction of the tubed vortex reducer at the same time. Co-rotating cavity and the tube are the key factors influencial factors to the flow resistance and temperature reduction characteristics of the tubed vortex reducer

with the shift of the weight. When the tube length increased

the pressure loss in tubed vortex reducer was reduced by sacrificing the pressure loss in the tube and reducing the pressure loss in the co-rotating cavity. The rapid increase of the temperature reduction in the tube contributed a lot of to the increase of the temperature reduction coefficient of the tubed vortex reducer. The pressure loss coefficient of the tubed vortex reducer decreased by 8370% and the temperature reduction coefficient increased by 4502% compared with the smooth co-rotating cavity model when the tube length L/b was 0786.