Principle of Conforming Water-Fuel Ratio for Metal Matrix Fuel Water-Ramjet Engine

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When water-ramjet engine working, its water-fuel ratio is needed to conform. Taking magnesium-based fuel for example, thermodynamic parameter of different formulation fuel under different water-fuel ratio was calculated with the free energy minimization method. It was found that the effective specific impulse of water-ramjet engine increased first and then decreased with the increasing of water-fuel ratio, so there was the maximum value of it, named optimum specific impulse. The corresponding water-fuel ratio was the best one, and then the performance ability of water-ramjet engine was the maximum one. The temperature of nozzle exit gradually decreased with the increasing of water-fuel ratio. When the temperature was lower than local vaporization temperature, water steam coagulated and it would cause the thrust force to decline. Therefore, when the water-ramjet engine is designed, the value of water-fuel ratio can't exceed the best water-fuel ratio by the premise of guarantee of the temperature of nozzle exit as high as possible.

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Periodical:

Edited by:

Daizhong Su, Qingbin Zhang and Shifan Zhu

Pages:

474-477

DOI:

10.4028/www.scientific.net/KEM.450.474

Citation:

Y. Gao et al., "Principle of Conforming Water-Fuel Ratio for Metal Matrix Fuel Water-Ramjet Engine", Key Engineering Materials, Vol. 450, pp. 474-477, 2011

Online since:

November 2010

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$35.00

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