双螺杆泵, 渐开线, 修形, 流场, 数值模拟, 涡流

A new kind of highly effective, sealing superiorly and involute-modified twin-screw pump was proposed, compared with cycloid twin-screw pump and based on limited volume method,the numerical simulation models of two kinds of pumps were established. By analyzing their pressure fields, velocity fields and so on basic rules, the twin-screw pumps flow channels’ volumetric efficiency were obtained. The research indicates that the flow channel pressure progressively increases along with the sealed chamber, the peer pressure is in the tendency of reduction as a result of leakage; the eddy flow phenomenon exists in the flow channel spiral flute, the meshing area is mixed intensely, the negative axial velocity exists in the contact area of rotor and pump cover’s wall surface and the meshing area which are the main leakage areas. Involute-modified twin-screw pump volumetric efficiency is relatively high, with superior sealing performance. The research findings will provide the theory basis for the later screw pump’s development design.

twin-screw pump, involute;modify;flow field;numerical simulation;eddy flow