JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
title非軸対称ディフューザによる遠心圧縮機の作動域拡大
Other TitleExtension of Operating Range of a Centrifugal Compressor by Use of a Non-Axisymmetric Diffuser
Author(jpn)鄭, 新前; 林, 韵; 川久保, 知己; 玉木, 秀明
Author(eng)Zheng, Xinqian; Lin, Yun; Kawakubo, Tomoki; Tamaki, Hideaki
Author Affiliation(jpn)清華大学; 清華大学; 株式会社IHI; 株式会社IHI
Author Affiliation(eng)Tsinghua University; Tsinghua University; IHI Corporation; IHI Corporation
Issue Date2016-05-23
PublisherIHI技術開発本部技術企画部
Corporate Research & Development, IHI
Publication titleIHI技報
Journal of IHI technologies
Volume56
Issue2
Start page45
End page59
Publication date2016-05-23
Languagejpn
eng
Abstract近年,過給機に用いられる遠心圧縮機には大容量化や高圧力比化などの性能向上が求められる一方で,搭載性やコストの観点からはコンパクト化が要求されている.この相互に矛盾する要求のため,内部流速は増し,非軸対称形状を有するスクロールにおいて生じる圧力分布の周方向ひずみが増加することになり,圧縮機の安定作動範囲は縮減される.この課題を解決するために,非軸対称な流路形状を有するベーンレスディフューザが考案された.これによって周方向圧力ひずみが緩和され,不安定化要因となる流れ状態の発生を遅らせることが可能となる.軸対称と非軸対称のディフューザについて性能試験を実施し,非軸対称設計によって安定作動範囲が28%拡大することを確認した.
In recent years, higher performance, including higher flow capacities and pressure ratios, is required of the centrifugal compressors used in turbochargers, while compactness is also required in views of improved installability and lower costs. Due to these mutually conflicting requirements, the internal flow velocity tends to increase and the circumferential pressure distortion generated by the non-axisymmetric geometric nature of the discharge scroll gets harsher, and both of these result in the reduction of the stable operating range. In an attempt to overcome this difficulty, a vaneless diffuser with a non-axisymmetric passage geometry has been developed which can suppress the circumferential pressure distortion and consequently retard the occurrence of the destabilizing flow conditions. Performance tests of both the axisymmetric and the non-axisymmetric diffusers confirmed that the non-axisymmetric design can extend the stable flow range by 28% over the conventional axisymmetric design.
Description形態: カラー図版あり
Physical characteristics: Original contains color illustrations
Document TypeTechnical Report
NASA Subject CategoryMechanical Engineering
ISSN1882-3041
NCIDAA12247265
SHI-NOAA1640108003
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/571973


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