The influence of the vane diffuser head losses curve on the external characteristic of high specific speed pumps

Impacts of blade inlet angle of diffuser on the performance of a submersible pump

“…The flow rate and the head at the highest efficiency are the optimal operating points of a submersible pump, and they can be obtained by solving the equations of a diffuser and an impeller in parallel or based on the intersection point of their characteristic curves. 17 When the impeller inlet has no pre-rotation, the diffuser characteristic equation (equation 1) can be derived from the basic equation of a centrifugal pump and the inlet velocity triangle of a diffuser, whereas the impeller characteristic equation (equation 2) can be derived from the basic equation of a centrifugal pump and the impeller outlet velocity triangle…”

“…The flow rate and the head at the highest efficiency are the optimal operating points of a submersible pump, and they can be obtained by solving the equations of a diffuser and an impeller in parallel or based on the intersection point of their characteristic curves. 17…”

“…However, these studies mainly focused on the characteristic analysis of flow fields inside the centrifugal pump impeller and the volute [10][11][12][13][14] ; hence, the internal flow field of the diffuser was not explored. [15][16][17][18][19][20] The impeller indeed is where the energy conversion takes place, yet this doesn't mean that the diffuser is treated as unimportant. Therefore, the influences of different design parameters of a diffuser on pump performance need to be investigated in detail.…”

“…22 Wojciech et al studied the effects of the interaction between impeller and diffuser on the Q-H curve and also analyzed the influences of the head loss curve of the diffuser on the Q-H curve of a highspecific speed pump. 17 Cong et al conducted an orthogonal design test on the inlet angle, the wrap angle, and the outlet angle of the diffuser of a deep well pump and pointed out that inlet angle and wrap angle manifested great influences on pump performance. 23 In recent years, numerical simulations based on computational fluid dynamics (CFD) are widely used in engineering optimization design.…”

Numerical study on the impact of the coupling of diffuser parameters on the performance of submersible pumps used in town water distribution systems

“…Researchers have performed considerable studies on the optimization design and performance prediction of centrifugal pumps. Based on the concept that submersible pumps belong to the category of centrifugal pumps, research mostly focuses on the calculations pertaining to and characteristic analysis of the internal flow field surrounding the centrifugal pump impeller and volute [10][11][12][13][14][15][16][17][18]. For submersible pumps with diffusers, pertinent studies on electrical submersible pumps (ESPs), in which the impeller and diffuser compose a single stage, have been reported in the literature [19][20][21]; these studies include those pertaining to independent structural parameters that affect the pump performance and structural optimization [22][23][24].…”