Abstract
Compact centrifugal blowers with vaned diffusers are often used in home electric vacuum cleaners. To achieve high efficiency and low noise, it is important to improve the performance of impellers and diffusers. In this study, we used a large solidity diffuser whose flow duct is low in height. We studied the influence of internal flow on the diffuser performance by using PIV and pressure measurement and visualizing the flow field in detail. From our measurement results, low velocity was observed in the middle span section and the pressure side in the middle of the overlapped region. Area of the low velocity region became larger with the decrease of flow rate. Pressure recovery increased gradually at the downstream of the low velocity region. From our simulation results, we found that in the low velocity area, low-energy fluid from shroud and hub regions accumulated to the middle span region, which led to low velocity in the middle of the overlapped region.
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