Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 19, 2024 - November 20, 2024
The camber line of the inducer is important in designing the inducer because it has a large effect on the suction performance and the state of cavitation. In general, the straight section with a constant blade setting angle is maintained up to the inlet throat, and the camber line is curved beyond that point, but there is no clear basis for this. In this study, four types of camber lines with different lengths of the straight section were designed, and a multiphase unsteady analysis was performed on two-dimensional cascades assuming inducer blade tips with each camber line. The effects of the difference in camber line on suction performance and unsteady cavitation behavior were then analyzed. As a result, it was found that the relationship between the length of the flat plate blade and suction performance varies depending on the flow rate. At the design flow rate, the suction performance was best when the flat plate blade was 20% of the chord length. At low flow rates, the suction performance was best when the shape was maintained up to the throat. In addition, numerical simulations showed that the cascade with shorter flat blades resulted in faster cavitation growth and a wider range of cavitation instabilities.
