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| Matching research of inducer and impeller of high-speed centrifugal pump |
| Wang Wenting, Chen Hui, Li Yongpeng, Du Yujie |
| Xi′an Aerospace Propulsion Institute, Xi′an, Shannxi 710100, China |
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Abstract The propellant pump of specific liquid propellant rocket engine suffers from serious pressure fluctuation,the bad matching of inducer and impeller is an important cause of larger pressure fluctuation and lower performance of pump.the In order to study the effect of matching of inducer and impeller on pump hydraulic performance and pressure fluctuation, numerical simulation by using commercial CFD code were carried out to analyze the detailed impact of various inducer configurations on pump flow filed and performance. The results show that, for the high-speed centrifugal pump with large flow rate, using the inducer with equal-pitch outlet is advantageous to improve the flow effect of impeller inlet, and can improve its performance evidently. The larger inducer blade turning angle can result in the reflux in impeller inlet,and lower performance of pump.Compared to the inducer type, the relative position between inducer and impeller has smaller impact on pump performance. The decrease of axial distance between inducer and impeller results in the flow field distribution in impeller getting worse, and the performance of pump lower.Considering cavitation performance,pressure fluctuation levels and efficiency of pump,the final scheme is choosing the inducer with variable-pitch inlet and equal-pitch outlet.
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Received: 05 November 2013
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