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Suppression of Restricted Shock Separation in Overexpanded Rocket Nozzles

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 2005 English Publisher:Japan Society of Mechanical EngineersJournal:TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, volume 71, pages 2,702-2,709 (issn: 0387-5016, eissn: 1884-8346,

Authors: Yoshinobu Tsujimoto; Koichi Yonezawa; Tsuyoshi Morimoto; Kazuhiko Yokota; Yasuhide Watanabe;

doi: 10.1299/kikaib.71.2702

Suppression of Restricted Shock Separation in Overexpanded Rocket Nozzles

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Abstract

Restricted shock separation (RSS) occurs in new bell type rocket nozzles such as the compressed truncated perfect nozzle and the thrust optimized nozzle. RSS may cause two serious problems. The first is the large side load on the nozzle and the second is the damage on the regenerative cooling tubes. In the present paper, the method to suppress RSS is introduced. Both numerical and experimental flow analyses or the shutdown transient are performed. The results show that a small step in the nozzle surface can change the location of the separation point at higher nozzle pressure ratio (NPR) than the RSS occurrence and RSS can be supressed. Additionally, the results of side load measurement show that the side load caused by the step is smaller than that caused by RSS.

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Osaka University
Japan

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