Characteristics of Dynamic Load on Nozzle Extension of Extendible Nozzle
- Paper number
IAC-05-C4.2.06
- Author
Dr. Masaki Sato, Japan Aerospace Exploration Agency (ISTA/JAXA), Japan
- Coauthor
Dr. Shinichi Moriya, Japan Aerospace Exploration Agency (ISTA/JAXA), Japan
- Coauthor
Mr. Kazuo Kusaka, Japan Aerospace Exploration Agency (ISTA/JAXA), Japan
- Coauthor
Mr. Makoto Tadano, Japan Aerospace Exploration Agency (ISTA/JAXA), Japan
- Coauthor
Mr. Masahiro Sato, Japan Aerospace Exploration Agency (ISTA/JAXA), Japan
- Coauthor
Dr. Keiichi Hasegawa, Japan Aerospace Exploration Agency (ISTA/JAXA), Japan
- Year
2005
- Abstract
An extendible nozzle for the altitude compensation, which deploys the nozzle extension during firing, is considered to be a feasible device to improve the performance of a booster engine throughout the ascent trajectory of a launch vehicle. For the design of the nozzle extension and its driving mechanics, it is required to investigate the characteristics of dynamic load on the nozzle extension with changes in the altitude and the extended position. Hot firing tests which simulate the altitude change were carried out at the High Altitude Test Stand with varying the ambient pressure. The nozzle extension was sustained at an arbitrary extended position by supporting truss consist of six rods. Axial thrust and side-loads on the nozzle extension were measured using small load cells installed in each supporting rod. The successive change in axial thrust and the sudden side-loads due to the flow separation caused by varying the ambient pressure was observed and the large inverse thrust was found during the transition between fully expanded flow and fully separated flow. From the measured dynamic load data, the history of flow separation point was estimated based on the assumption of some flow patterns.
- Abstract document
- Manuscript document
IAC-05-C4.2.06.pdf (🔒 authorized access only).
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