1708 羽根車入口環状溝による遠心圧縮機の運転範囲拡大(S19-2 流体機械に関連した流動現象とその解析・計測(2)不安定流動・非定常流動の計測と解析,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In a turbocharger for diesel engines, a high pressure ratio and a wide operation range are required to achieve extemely low exhaust emissions. In the present study, the ring groove arrangement was adopted to enhance a flow range in a centrifugal compressor of automobile turbocharger. 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 calculated by using ANSYS-CFX code, it becomes clear that the ring groove arrangement is effective for supression of separation at the leading-edge of main blade even in small flow rates. The reverse flow appeared on the shroud casing is sucked out from the downstream groove, and the recirculation flow was formed in the groove arrangement. The flow incidence at the main blade leading edge is reduced surccessfully by about 5〜7 degrees due to the increased incoming flow rate.
社団法人日本機械学会の論文
2008-08-02