Abstract
Axial flow pump has been widely used in hydraulic engineering, agriculture engineering, water supply and sewerage works, and shipbuilding industry. In order to improve the hydraulic performance of pump under off-design working conditions, the influence of the inlet segment axial chord and inlet angle adjustment of the guide vane on the pump segment efficiency and flow filed was simulated by using the renormalization group (RNG) k − ε turbulent model based on the Reynolds-averaged Navier–Stokes equations. The results indicate that the inlet segment axial chord and inlet angle adjustment of guide vane have a strong influence on the pump segment efficiency. Considering the support function and hydraulic loss of the guide vane, the inlet segment axial chord is set to 0.25 times the axial chord of guide vane. On the basis of the inlet angle of the guide vane under design conditions, when the inlet segment angle is turned counterclockwise, the pump segment efficiency is improved in the lower flow rate region; moreover, the pump segment efficiency is improved in the larger flow rate region when the inlet segment angle is turned clockwise. As the conditions deviate from the design working conditions, the influence of the guide vane inlet angle on the pump segment efficiency increases. If the inlet segment angle is properly adjusted under off-design working conditions, the flow pattern in the guide vane is improved and the hydraulic loss is decreased, because the inlet segment angle matches with the flow direction of impeller outlet; consequently, the pump segment efficiency is increased.
Highlights
Vane pump is widely used in mechanical engineering, hydraulic engineering, civil engineering, and military industry.e application of vane pump is affected by its stable and efficient operation. erefore, it is necessary to pay attention to the optimization of the pump [1,2,3,4], and paying attention to the research on pressure pulsation, cavitations, vibration, and noise is necessary [5,6,7,8]
Axial flow pump is widely applied to low head pumping stations in the fields of water resource allocation, water environment improvement, urban flood control, irrigation, and drainage. e guide vane is an important part of the axial flow pump that is used to recover the kinetic energy of the flow at the impeller outlet [9, 10]. e hydraulic performance of guide vane has great influence on the hydraulic performance of axial flow pump and pump system
For off-design working conditions, the inlet angle of the guide vane is inconsistent with the flow direction of the impeller outlet, which leads to an increased hydraulic loss of the guide vane and a reduced axial flow pump efficiency
Summary
Vane pump is widely used in mechanical engineering, hydraulic engineering, civil engineering, and military industry. For off-design working conditions, the inlet angle of the guide vane is inconsistent with the flow direction of the impeller outlet, which leads to an increased hydraulic loss of the guide vane and a reduced axial flow pump efficiency. Some studies have explored adjusting the guide vane angle and its effect on the hydraulic performance of an axial flow pump under offdesign working conditions; the results indicate that a complete adjustment of the guide vane angle improves the flow pattern in the guide vane and reduces the hydraulic loss, with a head improvement of 0.4964 m and a pump efficiency improvement of 2.1648% measured in [19]. Us far, no studies on matching the inlet angle of the guide vane with the flow direction of the impeller outlet for an axial flow pump have been reported. According to the numerical simulation results, the reason of the influence of inlet angle of guide vane on the hydraulic performance was analyzed. e study work has important reference value for the hydraulic design and hydraulic performance improvement of an axial flow pump
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