In order to improve the centrifugal pump performance at off-design operation condition, water-admission is introduced at the upstream of impeller inlet. This paper treats a centrifugal condensate pump with the specific speed of 216 min−1·m3/min·m. Both hydraulic and cavitation performance have been experimentally tested for the pump. For analysis, the three-dimensional cavitating turbulent flows are simulated based on RANS method and a homogeneous cavitation model for several water-admission cases. The results indicated that with the water-admission, the pump head and hydraulic efficiency increase with the water-admission pressure up to 70kPa. However, with the water-admission pressure larger than 70kPa, the pump performance drops due to a large flow rate induced upstream the pump impeller. It is also noted that the water admission is unfavorable for cavitation inception. According to the numerical result, there is a sudden increase of accumulated cavity volume inside the impeller with the water-admission pressure larger than 70kPa. Thus, the water-admission should be further studied to improve the cavitation performance.
Effects of Water-Admission on the Performance of a Centrifugal Pump
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Guo, X, Yu, W, & Luo, X. "Effects of Water-Admission on the Performance of a Centrifugal Pump." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1A: Symposia, Part 2. Seoul, South Korea. July 26–31, 2015. V01AT02A010. ASME. https://doi.org/10.1115/AJKFluids2015-02616
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