Role of Injection in Hybrid Rockets Regression Rate Behaviour

Scale effect of fuel regression rate in hybrid rocket motor

“…The results of simulations indicated that the regression rates varied significantly among the different scales and decreased with motor size. Wooldridge and Muzzy [22], Chiaverini et al, Evans et al [8], George et al [13,14], Carmicino and Russo-Sorge [1], and others have noticed the effect of the fuel port size on fuel regression rate, showing that regression rate decreases with increasing port diameter. Gany [12,11] proposed a detail theoretical similarity model for scaling of hybrid motors, and the results showed that geometric similarity, same propellant combination and the same Reynolds number preserve similarity of different scale systems, and in the similar condition, fuel regression rate was inversely proportional to the fuel port diameter.…”

“…The Marxman model indicates that the mass flux is the fundamental factor governing the rate of fuel consumption; furthermore, the regression rate is a weak function of the axial distance and propellant properties. Given the grain length and propellant combination, the averaged regression rate law can be simplified as: (1) However, the scale effects of fuel port geometry on regression rate were not announced in Marxman's law. This is not surpris-* Corresponding author.…”

Experimental set up for characterization of carbide-based materials in propulsion environment

“…12 Being equipped with a test bench and a general purpose acquisition system, it is extremely versatile as it is possible to easily adjust the experimental apparatus to several classes of tests, including evaluation of performances of propellants and combustion processes, testing of sub-components and/or complete power systems, nozzles, air intakes, catalytic systems, burners, ignition and cooling systems. [13][14][15][16] The layout of the engine used in the present work, including injector, ignition, single-port cylindrical fuel grain, pre and postcombustion chambers, and expansion nozzle, is illustrated in Fig. 1.…”

Measurement of regression rate in hybrid rocket using combustion chamber pressure

“…It is due to nonlinear burning of fuel with burn time. Various methods have been used by the researchers to determine the regression rate of hybrid rocket fuel such as ultrasonic technique [4][5][6][7][8][9][10][11][12], X-ray radiographic technique [7,9,[13][14][15], and weight loss method [16][17][18][19][20][21][22][23][24][25][26][27]. In an ultrasonic technique, an array of transducers will be needed to get the complete regression rate, which would increase the overall cost and complexity of the set up.…”

“…These increases the overall cost of the system. The weight loss method [16][17][18][19][20][21][22][23][24][25][26][27] is the most widely used method to determine the regression rate. The drawback of this method is that to get a complete trend line of regression rate vs G ox , a series of experiments need to be carried out.…”