Investigation on the influence of jetting equipment on the characteristics of centrifugal pump

Abstract

To reduce radial noises from the motor of centrifugal pumps, this study designed a water cooling system called jetting equipment to replace traditional fan cooling systems in pump motors. By measuring radiated noises, head, efficiency, and cavitation performance, the research compared the differences among experimental results of the original pump unit, the one with a normal design jetting pipe and another one with a larger jetting pipe. Results show that the radiated sound pressure level of the model pump was significantly reduced by 8.3 dB after integrating the jetting pipe. With a normal jetting pipe, no significant changes were observed in the head, efficiency, and shaft power curves, and cavitation performance improved under small flow rate. However, the performance with the larger jetting pipe worsened, except the hump phenomenon of the model pump under a small flow rate was enhanced. Computational fluid dynamics method was used to calculate the internal flow of three model pumps in order to investigate the jetting flow effect. A comparison among the flow fields at the inlet of the three types of pumps indicated that high-pressure water injection can effectively control inlet recirculation and improve velocity distribution in the inlet flow field with decreased recirculation vortex strength and recirculation onset critical flow rate.

Influence of an Inlet Rotating Axial Device on the Cavitation Processes in a Low Specific Speed Centrifugal Pump

“…Sі et. al [4] presented a method for improving the cavitation performances of the centrifugal pump by introducing a jet flow into the pump inlet device. However, the cavitation performances of the pump deteriorated with the increase of the flow rate.…”

Fundamentals of cavitation and bubble dynamics with engineering applications

“…In Ju et al, 2 cavitation in the automotive torque converter was numerically investigated using a well-known homogeneous cavitation model with experimental validations. In Si et al, 3 performances of jetting equipment were experimentally and numerically evaluated with its influences on the characteristics of centrifugal pumps. Cavitation performance of the pumps was tested along with other important characteristics.…”

Influence of Rotational Wall of Axial Inlet Device on Velocity Distribution at Impeller Inlet

“…It stabilizes the fluid flow and provides its delivery with a uniform axial component of the absolute velocity in the flow cross-section. The flow structure in such an inlet casing in the overhung single stage pumps is analyzed in articles [8][9][10][11]. The authors found little uneven distribution of components of the absolute velocity with an increasing radius of a flow cross-section.…”