Collaborative Design of the Wrap Angles Between Impeller and Space Diffuser of Diagonal-Flow Pump

The wrap angle is one of the key parameters in design of impeller and space diffuser. At present, it is mainly designed based on theoretical estimation and experience. However, there are few studies on collaborative design. In this paper, the process model of collaborative design was put forward, then 25 kinds of wrap angle matching schemes between impeller and space diffuser were determined by orthogonal experimental method, and it was completed to study basic change law of the external characteristics and flow field under different matching schemes. It was shown that impeller wrap angle had more obvious influence on the hydraulic characteristics than space diffuser wrap angle within a certain wrap angle range. Therefore, the optimal impeller wrap angle should be determined in the collaborative design at first. By the multidimensional evaluation criteria, it was carried out such as the selection of the space diffuser wrap angle. It can reduce a lot of work to easily find a better balance about multi-influence of the multi-component parameters, and get an optimal performance when the diagonal-flow pump is used in oil and gas development.