Abstract：To achieve high efficiency and low pressure pulsation, the slant angle of tilt volute and clearance between impeller and volute were controlled. A centrifugal pump with tilt volute of specific speed 130 was simulated by Fluent software at the same boundary conditions. The results show that when clearance rate keeps constant, the hydraulic efficiency reaches maximum at slant angle of 15°. The hydraulic efficiency is increased with the increasing of clearance rate with maximal value at clearance of 0.308. FFT(Fast Fourier Transform Algorithm) was adopted to transform timedomain pressure signals into frequencydomain pressure signals. The magnitude of pressure pulsation at fBP obtains minimum value at slant angle of 15°. The amplitude of pressure pulsation at fBP is decreased with the increasing of clearance rate. The clearance rate is suggested in the range from 0.134 to 0.192 because the clearance rate is limited by radial dimension.
2013, Vol. 34 
