Study on Design Method Considered Circulation Flow and Low Flow Rate Characteristics of a Centrifugal Blower Casing

考虑循环流及低流量特性的离心风机机壳设计方法研究

• 批准号: 09650192
• 负责人: FUKUTOMI Junichiro
• 金额: $ 0.9万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650192/
• 关键词: Turbomachinery; Blower; Pressure Recovery; Diffuser; Secondary flow; Flow Visualization; Boundary Layer Suction; Casing; ブロワ-

Flow in a blower casing which has no diffuser and large tongue clearance was studied. The following conclusions were obtained.(1) Pressure recovery in the casing, at the design point, was 45 percent in the scroll. The remaining 55 percent was recovered in the section between the scroll end and exit duct.(2) The section between the scroll end and exit duct acts as a high-performance diffuser. Centrifugal force produced by secondary flow and boundary layer suction are the main cause of high pressure recovery.(3) At the inlet of the exit duct, where the pressure suddenly rose, a reverse flow occurred on the shroud side wall of the casing and the upper part of the scroll wall at the flow rate Q/Q_d=O.61. This separation zone grew with decreasing flow rate.(4) Flow conditions in the section from the scroll end to the exit duct closely related to the low flow rate characteristics of the blower.

研究了无扩压器、大舌片间隙的风机壳体内的流动。得出以下结论。(1)在设计点，蜗壳内的压力恢复为45%。其余的55%在涡卷端部和出口管道之间的部分中回收。(2)涡卷端和出口管道之间的部分充当高性能扩散器。二次流产生的离心力和边界层抽吸是高压恢复的主要原因。(3)在出口管道入口处压力突然升高，在壳体的围带侧壁和涡壳壁的上部出现了反向流动，流量Q/Qd = 0.61。该分离区随着流速的降低而增大。(4)从涡旋端到出口管道部分的流动条件与鼓风机的低流量特性密切相关。

项目成果

J.Fukutomi,A.Itavashi Y.Senoo,Y.Nakase T.Kawauchi: "Pressure Recovery in a Centrifugal Blower Casing" Bulletin of Faculty of Engineering The University of Tokushima. Vol.44. 65-71 (1999)

J.Fukutomi、A.Itavashi Y.Senoo、Y.Nakase T.Kawauchi：“离心式鼓风机外壳中的压力恢复”德岛大学工程学院通报。

J.Fukutomi, A.Itabashi, Y.Senoo, Y.Nakase, T.Kuwauchi: "Pressure Recovery in a Centrifugal Blower Casing" Bulletin of Faculty of Engineering, The University of Tokushima. Vol.44. 65-71 (1999)

J.Fukutomi、A.Itabashi、Y.Senoo、Y.Nakase、T.Kuwauchi：“离心式鼓风机外壳中的压力恢复”德岛大学工程学院通报。

J.Fukutomi,A.Itabashi,Y.Senoo,Y.Narase,T.Kuwauchi: "Pressure Recovery in a Centrifugal Blower Casing" Bullatin of Faculty of Engineering of Tokushima. Vol.44. 65-71 (1999)

J.Fukutomi、A.Itabashi、Y.Senoo、Y.Narase、T.Kuwauchi：“离心式鼓风机外壳中的压力恢复”德岛工学院公报。