Abstract
The investigation of the clocking effect mainly concentrates on turbines and compressors, but seldom in centrifugal pumps. In this paper, using numerical simulation and experiment, the influence of the clocking effect on the hydraulic performance of centrifugal pump with guide vane is studied. Numerical simulations with SST k-w turbulence model were applied to obtain the inner flow field of the test pump. The numerical simulations coincide with the test result, which indicates the accurate of the utilized numerical approach. The results show the clocking positions have an important effect on hydraulic performance of the centrifugal pump with guide vane. The pump demonstrates the higher efficiency and head as the tongue locate between two guide vanes. The hydraulic performance of the volute is a major factor impacting the performance of the centrifugal pump with different clocking positions. However, the clocking position has almost no effect on the performances of the impeller and diffuser. When the guide vane is close to the volute tongue, flow field of volute is more non-uniform, and the energy loss in volute appears to be larger. The results and the method of this paper can provide theoretical reference for the design and installation of guide vane in centrifugal pump.
Highlights
The guide vane is a significant flow passage component for rotating machinery and can be applied in turbines, compressors and pumps
Städing et al [5] experimentally investigated the clocking effect on the aerodynamic performance of a 3 stages compressor, and the results indicated that the aerodynamic efficiency under the design condition and low load condition was maximum when the wake flow in the upstream passed through the middle passage of downstream stator, it reached minimum while the wake flow from the upstream was closed to the ledge edge of the downstream stator
The impact of the clocking effect on the inner flow field in the axil compressor has been widely investigated based on the numerical simulation and experimental method [8,9,10,11,12,13,14,15,16], and the stator clocking effect has a significant impact on the boundary layer, kinetic energy and pressure fluctuation in the downstream region
Summary
The guide vane is a significant flow passage component for rotating machinery and can be applied in turbines, compressors and pumps. The clocking effect is first discovered by Huber et al [1] in a 2.5 stage turbine, and the results showed that the performance of turbine could be improved by appropriately adjusting the circumferential position of the wake flow from the first stage stator They carried out the experiment to study the influence of the circumferential positions between the two stator rows in turbine and obtained a similar conclusion. Hathaway et al [2], Doney et al [3], Arnone et al [4] conducted numerical simulation and experiment on the clocking effect in compressors They pointed out that the impacting of the stator clocking position on the efficiency could be up to 0.3 %-0.7 %. The impact of the clocking positions on the hydraulic performance of the centrifugal pumps with guide vane has been studied by adopting both numerical simulation and experiment. The results can provide theoretical reference for the design and installation of guide vane in centrifugal pump
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