Study for the Increase of Micro Regenerative Pump Head

Abstract

The effect of inlet and outlet blade angles on a micro regenerative pump head was examined in experiments. The pump head was little increased by changing the blade angles compared with the original pump with the inlet and outlet blade angles of 0 degree. The effect of the axial clearance between the impeller and the casing on the pump head was also examined. The head was increased largely by decreasing the axial clearance. The computation of the internal flow was performed to clarify the cause of the increase of the pump head due to the decrease of the clearance. The local flow rate in the casing decreased as the leakage flow rate through the axial clearance decreased due to the decrease of the clearance. It was found that the larger head in the smaller clearance was just caused by the smaller local flow rate in the casing. In the case of the smaller clearance, the smaller local flow rate caused the smaller circumferential velocity near the front and rear sides of the impeller. This caused the increase of the angular momentum in the casing and the head.

Improvement of Regenerative Pump Performance by Using Blade with Combined Angles Modification

“…In the current work, this point is examined on an impeller with an inclination and chevron angles of +15° each and their effect on the discharged pressure is compared with that produced by the standard radial impeller. A model is built using CFD programs and is validated by comparing the numerical results with the experimental data of Horiguchi et al 2009 [7].…”

“…In the current work, a numerical model is built and validated based on the results obtained by Horiguchi et al 2009 [7]. The micro-RP considered has the same specifications and dimensions tabulated in Table 1 and illustrated in Figs.…”

“…3a and 3b. Data used in the present work are taken from reference [7]. The pump performance was determined by using a control valve at the discharge pipe to adjust the flow rate by measuring the volume of the discharged fluid.…”

“…In order to investigate the suggested modifications, a commercial software ANSYS CFX-19.0 is used to perform 3D unsteady simulation for the flow analysis of the described RP. The Reynolds Averaged Naiver-Stokes equation (RANS) combined with the Sheer Stress Transport (SST) turbulence model are employed, as recommended by [7]. The Reynolds number, defined based on the diameter of impeller DT and the tip speed UT, is about 2×10 5 .…”

The Performance Analysis Method with New Pressure Loss and Leakage Flow Models of Regenerative Blower

“…However, because regenerative blowers are operating with low efficiency or a lot of pressure loss resulted from the internal flow phenomena of regenerative blower [1,2], there are growing industrial needs of the reliable design method for minimizing the pressure loss as well as achieving high blower efficiency. Generally, it is known that the reliability of regenerative blower design method is strongly dependent on the prediction accuracy of the performance analysis model used in design practice.…”