Pressure fuctuation may cause high amplitude of vibration of double-suction centrifugal pumps, but the impact of impeller stagger angles is still not well understood. In this paper, pressure fuctuation experiments are carried out for fve impeller confgurations with diferent stagger angles by using the same test rig system. Results show that the stagger angles exert negligible efects on the characteristics of head and efciency. The distributions of pressure fuctuations are relatively uniform along the suction chamber wall, and the maximum pressure fuctuation amplitude is reached near the suction inlet tongue region. The pressure fuctuation characteristics are afected largely by impeller rotation, whose dominant frequencies include impeller rotation frequency and its harmonic frequencies, and half blade passage frequency. The stagger angle exerts a small efect on the pressure fuctuations in the suction chamber while a great efect on the pressure fuctuation in volute casing, especially on the aspect of decreasing the amplitude on blade passage frequency. Among the tested cases, the distribution of pressure fuctuations in the volute becomes more uniform than the other impeller confgurations and the level of pressure fuctuation may be reduced by up to 50% when the impeller stagger angle is close to 24° or 36°. The impeller structure pattern needs to be taken into consideration during the design period, and the halfway staggered impeller is strongly recommended.
Da-Chun Fu
,
Fu-Jun Wang
,
Pei-Jian Zhou
,
Ruo-Fu Xiao
,
Zhi-Feng Yao
. Impact of Impeller Stagger Angles on Pressure Fluctuation for a Double-Suction Centrifugal Pump[J]. Chinese Journal of Mechanical Engineering, 2018
, 31(1)
: 10
-10
.
DOI: 10.1186/s10033-018-0203-z
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