Suppression of Cavitation Inducer by Cavitation Division Effect of Blade Gap
In order to improve the cavitation performance of a high-speed fuel pump,two inducer schemes with different slots are proposed based on cavitation division.Numerical simulation and experimental verification are used to study the flow field of inducer with different cavitation numbers,and the flow fields of the fully slotted inducer model(fully open model)and semi-slotted inducer model(semi-open model)are compared with the original model.The results show that compared with the original model,the lift and efficiency of the fully open model are obviously improved,and the semi-slotted gap has little effect on hydraulic performance.Under the design condition,the semi-slotted gap has better anti-cavitation performance.Under eccentric working conditions,the anti-cavitation performance of fully slotted gap is better.The slot treatment of the inducer blade can effectively prevent the expansion of the low pressure area at the inlet of the blade,and the large-scale cavitation distributed at the inlet of the blade is divided into several small-scale cavitation by the division of the slot,which can inhibiting the occurrence and development of cavitation under various working conditions.In addition,the gap can also reduce the amplitude of pressure fluctuations at the inducer inlet,but it has little effect on the outlet.The fully slotted gap significantly reduces the turbulent kinetic energy distribution at the inlet blade edge of the inducer and reduces the energy dissipation at the inlet section.
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