Overspeeding characteristics of turbomachinery for gas generator cycle air turbo ramjet engine

• Published in: Propulsion and Power Research Vol. 11; no. 4; pp. 444 - 456
• Main Authors: Minato, Ryojiro, Nakata, Daisuke, Uchiumi, Masaharu, Imai, Ryoji, Higashino, Kazuyuki
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2022; KeAi Communications Co., Ltd
• Subjects: Air turbo ramjet engine; Combustion efficiency; Compressor map; Overspeeding; Air turbo ramjet engine; Compressor map; Combustion efficiency; Overspeeding
• ISSN: 2212-540X; 2212-540X
• DOI: 10.1016/j.jppr.2022.10.001

The main interest in the current study focuses on the possibility of overspeeding for the gas-generator cycle air turbo ramjet (GG-ATR) engine. The authors developed the air turbo ramjet engine and investigated its compressor performance. Based on those data, the authors developed the analytical code for the air turbo ramjet engine, which calculates the performances of turbomachinery, gas-generator, and ram combustor. The previous study described that the rotor overspeeding would not occur in the air turbo rocket engine. However, the current results show that degraded ram combustion can decrease the compressor pressure ratio and the compressor power. This reduced compressor power can cause overspeeding for the air turbo ramjet engine. The experimental results of compressor power and turbine inlet pressure support those analytical results.