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International Journal of Rotating Machinery
Volume 2012, Article ID 259293, 8 pages
Research Article

Control of Surge in Centrifugal Compressor by Using a Nozzle Injection System: Universality in Optimal Position of Injection Nozzle

1Production Systems Engineering Course, Tokyo Metropolitan College of Industrial Technology, 1-10-40 Higashiohi, Shinagawa-ku, Tokyo 140-0011, Japan
2Graduate School of Engineering, Hosei University, 3-7-2 Kajinocho, Koganei-shi, Tokyo 184-8584, Japan
3Department of Mechanical Engineering, Faculty of Science and Engineering, Hosei University, Tokyo, Japan

Received 20 July 2012; Revised 28 September 2012; Accepted 9 October 2012

Academic Editor: N. Sitaram

Copyright © 2012 Toshiyuki Hirano et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The passive control method for surge and rotating stall in centrifugal compressors by using a nozzle injection system was proposed to extend the stable operating range to the low flow rate. A part of the flow at the scroll outlet of a compressor was recirculated to an injection nozzle installed on the inner wall of the suction pipe of the compressor through the bypass pipe and injected to the impeller inlet. Two types of compressors were tested at the rotational speeds of 50,000 rpm and 60,000 rpm with the parameter of the circumferential position of the injection nozzle. The present experimental results revealed that the optimum circumferential position, which most effectively reduced the flow rate for the surge inception, existed at the opposite side of the tongue of the scroll against the rotational axis and did not depend on the compressor system and the rotational speeds.