ターボチャージャ用遠心圧縮機内部流れの数値解析 : 環状溝による流動特性改善

概要

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In turbochargers for diesel engines, a high pressure ratio and a wide operating range are required to achieve extremely low exhaust emissions. In the present study, the ring groove arrangement was adopted to enhance a operating flow range in a centrifugal compressor for automobile turbochargers. The upstream groove was located at the casing wall of the suction pipe and the downstream groove was located at the shroud casing wall near the leading edge of the splitter blades, where both grooves were connected by an annular bypass. According to the numerical results by using ANSYS-CFX, it becomes clear that the ring groove arrangement is effective for suppression of separation at the leading-edge of main blade even in small flow rates. The reverse flow zone on the shroud casing is sucked out from downstream groove and the flow incidence at the main blade leading edge is reduced successfully by about 5 degrees due to the increased incoming flow rate.