Analysis of dynamic characteristics and sensitivity of hydrogen-oxygen expansion cycle rocket engine system. (December 2021)

• Record Type: Journal Article
• Authors: Zhou, Chuang; Yu, Nanjia; Wang, Jue; Jin, Ping; Cai, Guobiao
• Is Part Of: Acta astronautica. Volume 189(2021)
• Page Start: 624
• Page End: 637
• Publication Date: 2021-12
• Subjects: Hydrogen-oxygen expansion cycle -- Dynamic characteristics -- Structure sensitivity -- Cooling channel; Astronautics -- Periodicals; Outer space -- Exploration -- Periodicals; Astronautics; Periodicals; 629.405
• DOI: 10.1016/j.actaastro.2021.08.046
• Languages: English
• ISSNs: 0094-5765

Abstract

Abstract: The success of the launch mission depends on the dynamic characteristics of the rocket engine system, while the engine development process is based on the parameter sensitivity analysis. However, the dynamic characteristics and parameter sensitivity of the hydrogen-oxygen expansion cycle engine remain unclear. This research built the simulation model of basic components and overall system of the hydrogen-oxygen expansion cycle engine. A 3-factor and 9-level numerical simulation study was carried out based on the structural parameters of the cooling channel. Results show that at 0.1s after the ignition of the engine, the speed of oxygen pump drops by 16.4%, while the torque of the hydrogen turbine drops by 43.6%. The rise of coolant temperature between the inlet of the cooling channel and the outlet of combustion chamber is about 185 K, which is about 4 times of that between the outlet of combustion chamber and the first section outlet of the nozzle. The sensitivity of the response time to the rib height reaches 0.36, while the sensitivity of response time to the rib width and the nozzle wall thickness are 0.15 and 0.12, respectively. These findings contribute to the start-up analysis and design of the hydrogen-oxygen expansion cycle engine. Highlights: A model of the expansion cycle system was built. A 3-factor and 9-level simulation was carried out. The parameter of the oxygen pump would decrease at 0.1s. The temperature rise of inlet is 4 times that at the next section. The effect of the rib height is basically twice the rib width.