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| Effects of axial gap of impeller side cavity on pressure and leakage in balance chamber in centrifugal pump |
| LIU Zailun1,2, ZHOU Jinxin1*, CHEN Xiaochang1 |
| 1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Wenzhou Valve Engineering Research Institute, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China |
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Abstract In order to study influences of axial gap of impeller side cavity on pressure and leakage in the balance chamber of a centrifugal pump, the turbulent flows in the IS80-50-315 centrifugal pump were numerically simulated by using the RNG k-ε turbulence model when the axial gaps of impeller side cavity in the pump were 1, 4, 8, 12, 16 and 20 mm, respectively. The pressure distribution rules and variations of leakage with the gap size in the balance chamber were analyzed. An empirical formula of leakage was established based on the discharge coefficient, which was related to the dimensionless axial gap and the flow resistance coefficients across the side cavity, wear-ring gap and balance holes, respectively. The empirical relationship was applicable for the leakage prediction when the dimensionless axial gap was in a range of 0.006-0.127. It was found that the pressure in the balance chamber increased with increasing axial gap, especially for the gap in the range of 4 -16 mm. A little variation in the pressure was shown at the inlet of balance holes. The pressure on the wall of lid decreased with increasing cavity gap, but this phenomenon was not more obvious when the axial gap was 1 mm and 12 mm. Under the same working condition, the leakage increased with increasing axial gap. At a fixed axial gap, however, the leakage decreased with increasing pump flow rate.
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Received: 18 September 2016
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