A NEW CHALLENGE FOR IMPROVEMENT OF RECESSION RATE OF HIGH DENSITY POLYETHYLENE FUEL AND PARAFFIN FUEL OF HYBRID ROCKET WITH MULTI-SECTION SWIRL INJECTION
- Paper number
IAC-10,C4,2,10,x8612
- Author
Prof. Shigeru Aso, Kyushu University, Japan
- Coauthor
Mr. Takafumi MATSUZAKI, Kyushu University, Japan
- Coauthor
Mr. Wataru MITSUNAKA, Kyushu University, Japan
- Coauthor
Dr. Yasuhiro Tani, Kyushu University, Japan
- Coauthor
Mr. Ryuji NAKAWATASE, Kyushu University, Japan
- Year
2010
- Abstract
In order to improve combustion mechanism of hybrid rocket a new method for enhancement of combustion has been proposed. The new method is to introduce swirling flow throughout fuel grain tube through multi-layer swirl injection ports, which are placed at several location along fuel grain tube. The key issue is the method to generate swirling flow in the cavity of fuel grain at several cross section. In order to investigate the capability of a new injection system a new test combustion camber have been constructed. The combustion chamber has double tube system. In the outer tube fuel grain tube is located and gaseous oxygen is introduced through holes located in the narrow gap between outer cylinder and inner fuel grain from upstream and oxygen gas in injected into the inner fuel grain cavity through multiple injection ports. The diameter of injection port is 1 mm of diameter and inner and outer diameter of fuel grain is 35 mm and 70 mm respectively. At one cross section of fuel grain four injection ports are located at every 90 degrees location with deflected angle where injected oxygen generates swirl in the fuel grain cavity. The length of fuel grain is 400 mm and at four locations along the axis of fuel grain tube four sets of four injection ports are located. The method has been tested for paraffin fuel (FT-0070) with pressurized gaseous oxygen. Several combustion test have been conducted successfully with various injection methods. The results show the recession rate of the new method is 5 times larger than that of conventional method compared with the recession rate of high density polyethylene fuel. Since the recession rate of high density polyethylene fuel with the new injection method shows two or three times higher rate, the recession rate of paraffin fuel with the new injection method might show the same promising results. The present authors is conducting combustion experiment intensively and the results will be shown on the Symposium. The results show the new method is quite useful for the increase of the recession rate of paraffin fuel and the increase of the thrust of hybrid rocket engine.
- Abstract document
- Manuscript document
IAC-10,C4,2,10,x8612.pdf (🔒 authorized access only).
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