Investigation on the effect of complex impeller on vibration characteristics for a high-speed centrifugal pump

Abstract

In this article, to improve the vibration characteristics of a high-speed centrifugal pump, two new types of complex impeller were designed for replacing the original long-blade impeller. The experimental apparatus of pump vibration was designed and used to test the vibration signals of the model pump with the original impeller in frequency field. The vibration amplitude of 0.12 mm/s2 is observed on the shaft rotating frequency, while the amplitudes of 0.04 mm/s2, 0.14 mm/s2, and 0.2 mm/s2 respectively on the conditions of 0.8 QN, QN, and 1.2 QN appear on the impeller blade passing frequency. The computational fluid dynamics method was used to study internal flow characteristics in the pumps with three impellers for mitigating the pump vibration. Steady pressure nephogram shows big pressure difference existed in the complex-impeller pump, which means that the complex impeller can provide the high-lift water. Addition of the splitter blade can make the pressure-fluctuation amplitude of model pump to reduce obviously by the unsteady time–frequency analyses. Furthermore, two complex impellers were machined and used to conduct the contrast experiment on the vibration characteristics between the pumps with the original impeller and complex impeller. The results reveal that the water head of pump with the complex impeller is higher than that of the original pump, which verifies the simulated results. Meanwhile, the complex impeller has a positive effect on the decrease of pump vibration on the frequency domain, especially on the blade passing frequency the vibration amplitudes decrease by 0.08 mm/s2.

Influence of Blade Profiles on Plastic Centrifugal Pump Performance

“…e impeller is the core part of the centrifugal pump, and the impeller blade profile plays a vital role in the fluid flow which will directly impact the performance of centrifugal pumps. At present, there have been many studies on the influence of the impeller parameters on the flow characteristics of centrifugal pumps [11][12][13][14][15][16][17][18][19][20]. Tao et al [21] used the numerical method to study how the blade thickness influenced the flow characteristics in the impeller passages and volute casing.…”

Optimization Design for the Centrifugal Pump under Non-Uniform Elbow Inflow Based on Orthogonal Test and GA_PSO

“…The design of the centrifugal pump is generally based on the uniform inflow. The velocity of each fluid particle in the inlet section of the impeller is approximately the average velocity on the flow surface, while the direction is perpendicular to the outlet section of the suction chamber [7][8][9]. Under this ideal environment, the blade design makes the impeller achieve the best work.…”

Blades layout and optimization of medium specific speed centrifugal pump

“…In the optimization of centrifugal pumps, adding splitter blades is one of the most used optimization methods [2][3]. Yuan Y designed two impellers with different types of splitter blades for a high-speed centrifugal pump respectively, compared with the original impeller, the new impeller can not only improve the pump head but also reduce the vibration amplitude of the pump [4]. Mou J G concluded that under the condition that the design requirements were met, the impeller with long and short staggered blades has the best anti-cavitation performance [5].…”