combustion flowfield characteristics in single-element gH2/gO2 injector chambers
- Paper number
IAC-09.C4.P.11
- Author
Mr. Wang Xiaowei, Beijing University of Aeronautics and Astronautics, China
- Coauthor
Prof. Guobiao Cai, Beijing University of Aeronautics and Astronautics, China
- Coauthor
Ms. Jin Ping, Beijing University of Aeronautics and Astronautics, China
- Coauthor
Mr. Yuancheng Chi, Beijing University of Aeronautics and Astronautics, China
- Year
2009
- Abstract
In order to develop the gas-gas injector technology, the combustion flowfield characteristics in single-element GH2/GO2 injector chambers were investigated. A method to reveal the combustion development statuses and combustion completion lengths in single-element gas-gas injector chambers was designed, utilizing arrays of thermocouples to measure the temperature of the wall of heat-sink design combustor and combing numerical simulation of gas-gas combustion flowfield. This method can be applied to directly compare the combustion characteristics of different injectors to facilitate the experimental investigations and can also get the temperatures and heat flux of the injector face and the hot-gas-wall of combustor. The measurement method is described first. Through an experimental example and corresponding combustion numerical analysis, this method is introduced to how to reveal the combustion development status and combustion completion length. Influences of H2/O2 momentum ratio, chamber pressure and flared O2 post tip design on shear mixing injector combustion flowfield were investigated by applying this method. The range of H2/O2 momentum ratio was 0.67-1.5 and the range of the chamber pressure was 0.92MPa-6.1MPa. When one factor changed, others still kept constant. In the tests, the chamber is modular and can be easily configured to accommodate changes in the injector, several single-element shear mixing injectors were deigned and hot-fire tested, and GH2/GO2 were supplied to the injectors. The axial heat flux profile results for the injectors with higher H2/O2 momentum ratio and flared O2 post tip design showed the higher heat flux levels on the front parts of the combustors and the maximum heat flux levels at the shorter axial locations from the faceplates. The axial heat flux profile results for different chamber pressures showed the same distributions. These result indicated that the better mixing and the shorter combustion length can be obtained with the larger H2/O2 momentum ratio and a flared O2 post tip design, while different chamber pressures can hardly influence the combustion flow. Furthermore, the numerical analyses were conducted on these cases, and the same effects on the combustion flowfields of these factors were obtained. Overall, the results demonstrated that wall temperature measurement method and CFD predictions can be used in concert as tools for single-element injector design.
- Abstract document
- Manuscript document
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