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Experimental Research on the Hydraulic Performance of the Pump System Model for Zhuji Pumping Station in Yangtze-to-Huaihe Water Diversion Project
Zhong-jian QIN, Lei XU
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Experimental Research on the Hydraulic Performance of the Pump System Model for Zhuji Pumping Station in Yangtze-to-Huaihe Water Diversion Project
In order to improve hydraulic performance and ensure stable operation of Zhuji Pumping Station， an optimization design of the inlet conduit and outlet conduit is completed based on three-dimensional turbulent flow numerical simulation. The experimental research on the hydrodynamic characteristics of optimized pump system model is carried out on a high-precision hydraulic machinery test bed. The experimental results show that the flow velocity of the inlet and outlet conduit of Zhuji Station changes uniformly and the hydraulic loss of the conduit is small， the highest efficiency of the pump system model is 78.33%， and the hydraulic performance is excellent. Compared with the pump section， the optimal operation point of the pump system model is offset by about 2° to the negative angle and the small flow area. Secondly， when the inlet pressure of the pump system model is equal to the value of critical net positive suction head， the larger zones of cavitation bubbles are observed on the pressure side and suction side of the blades. Thirdly， the shaft frequency and blade passing frequency have greater influence on the pressure pulsation amplitude at the inlet and outlet of impeller， and they have less influence on pressure pulsation amplitude at the outlet of the guide vane. In order to avoid resonances， the natural frequency of the pump structure should avoid the pump shaft frequency， blade passing frequency and its frequency multiplication.
Yangtze-to-Huaihe Water Diversion Project / vertical axial-flow pump system / model test / hydraulic performance / cavitation performance / pressure pulsation {{custom_keyword}} /
Tab.1 Comparison of parameters on optimum operating condition between pump system model and pump model表1 泵装置模型与水泵模型TJ04-ZL-06最优工况点参数的比较 |
| 叶片安放角/（°） | 泵装置模型 | 水泵模型TJ04-ZL-06 | ||||
|---|---|---|---|---|---|---|
| 流量/（L·s-1） | 泵装置扬程/m | 泵装置效率/% | 流量/（L·s-1） | 水泵扬程/m | 水泵效率/% | |
| -6 | 256.53 | 3.79 | 78.29 | 299.1 | 3.73 | 85.10 |
| -4 | 276.60 | 3.91 | 78.33 | 321.8 | 3.73 | 85.27 |
| -2 | 292.54 | 4.12 | 78.26 | 339.7 | 3.90 | 85.46 |
| 0 | 307.86 | 4.21 | 78.19 | 357.5 | 3.98 | 85.53 |
| +2 | 320.01 | 4.59 | 77.93 | 374.8 | 4.21 | 85.84 |
Fig.6 Initial cavitation bubbles on blade under high head conditions图6 高扬程工况叶片初生空化泡 |
Fig.7 Cavitation bubbles on blade when efficiency drops by 1% under high head conditions图7 高扬程工况效率下降1%时叶片空化泡 |
Tab.2 Comparison of initial cavitation value and critical cavitation value under different operating conditions表2 不同工况时初生空化值与临界空化值对比 |
| 序号 | 流量/（L·s-1） | 净扬程H 装置/m | 初生空化值/m | NPSHC /m | 空化泡位置 |
|---|---|---|---|---|---|
| 1 | 358.32 | 1.87 | 7.85 | 6.98 | 工作面 |
| 2 | 305.45 | 3.71 | 14.54 | 6.32 | 背面 |
| 3 | 259.96 | 4.99 | 14.63 | 7.97 | 背面 |
Tab.3 Test results of runaway speed of pump system of Zhuji Pumping Station表3 朱集站泵装置飞逸转速试验结果 |
| 叶片角度/（°） | 单位飞逸转速/（r·min-1） | 原型飞逸转速/（r·min-1） | 原型飞逸转速与电机额定转速比值 |
|---|---|---|---|
| -8 | 307 | 291 | 1.74 |
| -6 | 312 | 295 | 1.77 |
| -4 | 304 | 288 | 1.73 |
| -2 | 295 | 279 | 1.68 |
| 0 | 288 | 273 | 1.64 |
| 2 | 281 | 266 | 1.60 |
| 4 | 272 | 258 | 1.54 |
Fig.10 Time domain and frequency domain diagrams of pressure pulsation when pump system head is 1.97 m图10 泵装置扬程1.97 m时压力脉动试验时域和频域图 |
Fig.11 Time domain and frequency domain diagrams of pressure pulsation when pump system head is 3.53 m图11 泵装置扬程3.53 m时压力脉动试验时域和频域图 |
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Fig.1 Flow fields of inlet and outlet conduit in pump system of Zhuji Pumping StationFig.2 Dimension of pump system model of Zhuji Pumping StationFig.3 Testing site of pump system modelFig.4 Comparison of energy performance curve between pump system model and pump model
Tab.1 Comparison of parameters on optimum operating condition between pump system model and pump modelFig.5 Curve between Q and NPSH of pump system model（n m=1 305.8 r/min，D m=0.30 m）Fig.6 Initial cavitation bubbles on blade under high head conditionsFig.7 Cavitation bubbles on blade when efficiency drops by 1% under high head conditionsFig.8 Cavitation bubbles on blade of initial and efficiency drops by 1% under low head conditionTab.2 Comparison of initial cavitation value and critical cavitation value under different operating conditionsTab.3 Test results of runaway speed of pump system of Zhuji Pumping StationFig.9 Pressure fluctuation measuring point positionFig.10 Time domain and frequency domain diagrams of pressure pulsation when pump system head is 1.97 mFig.11 Time domain and frequency domain diagrams of pressure pulsation when pump system head is 3.53 mFig.12 Time domain and frequency domain diagrams of pressure pulsation when pump system head is 4.92 m
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