| 摘要 |
PURPOSE:To improve efficiency in such a way that flow conductive vanes which are lower than the half of the diffuser width are provided on the surface of the flow passage at the inlet of the diffusers for centrifugal compressor or the like, and distorted flow at the inlet of the diffusers is forcibly drawn near to uniform distributed flows. CONSTITUTION:In flow conductive vanes 11 installed at the part of the inlet of a diffuser 5, its inlet angle beta3 is set to be a smaller value than the one for the designed average flow angle, and the outlet angle beta4 is determined to be almost the same as the designed average flow angle. Length of the flow conductive vanes 11 is set to be within the first half part of the diffuser flow passage in order to make the sufficient use of the characteristics of vaneless diffuser, and set to be lower than the half of the diffuser width. Thus, the distorted main flow at the outlet of an impeller 1 is forcibly drawn near to uniform distributed flows between the inlet parts of diffusers 5, 6 and the intermediate part, separation and reverse flow are eliminated near the wall surface of the diffusers, to prevent generation of unstable phenomena. |
