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| Effect of long and short blades on outlet pressure fluctuation characteristics of condensate pump |
| HU Jiang1, KANG Can 1*, XING Zhilong2, ZHANG Wenbin3 |
| 1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Shandong REACHEN Environmental Protection Engineering Co., Ltd., Zibo, Shandong 255095, China; 3. 704th Research Institute of CSSC, Shanghai 200031, China |
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Abstract In order to explore the pressure fluctuation characteristics in the outlet pipe of the condensate pump under the conditions of different long and short bladed structure, and deepen the understanding of the unsteady flow mechanism in the pump system. On the basis of the steady numerical si-mulation, the unsteady numerical simulation method was used to analyze the flow inside of the pump and the outlet pipe. The flow of the pump was simulated and analyzed, and the relationship between the pressure fluctuation in the pump outlet pipe and the position of the monitoring point and the flow rate under different working conditions was studied. The frequency domain characteristics and energy characteristics of the pressure pulsation corresponding to each bladed scheme were compared. The research results show that the external characteristics of the condensate pump with 5 long and 5 short blades scheme are better than the 3 long and 3 short blades scheme. The main frequency of each monitoring point is maintained at the blade frequency fBPF and its multiplier under the four flow conditions. The pump outlet pressure pulsation of the pump with 3 long and 3 short blades is more obvious and the change is more complicated when compared with that the 5 long and 5 short bladed scheme. The pressure pulsation intensity at the monitoring point of the pump outlet flange is higher, along the flow direction, the pressure pulsation gradually attenuates from the monitoring point P1 to P3. For the 3 long and 3 short blades scheme, under the condition of 1.4Qd flow-rate, the pressure pulsation characteristic of multi-frequency excitation in the pump outlet pipe is presented, and the unsteady flow excitation is intensified.
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Received: 30 October 2021
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