Regression Rates Study of Mixed Hybrid Propellants

A numerical investigation of oxidizer mixed hybrid rocket motors

“…Improved injector designs enable enhanced radial transport in the combustion chamber that improves the heat feedback to the fuel surface. The energetic additives to the solid fuel can be either metallic [10] or nonmetallic [9,11]. Metallic additives enhance the heat transfer to the fuel grain surface by means of enhanced radiation.…”

“…Typical regression rate enhancement techniques involve heat transfer improvement at the fuel surface by means of perturbed flow [1][2][3], improved injector design [4][5][6][7] or energetic additives to the solid fuel [8][9][10][11]. Disturbances in the flow field are typically caused by obstructions like diaphragms that form recirculation zones downstream of them.…”

Measurement of regression rate in hybrid rocket using combustion chamber pressure

“…Fig. 1 shows the comparison of regression rates for HTPB and oxygen combination obtained by various investigators [23,1,9,[30][31][32][33][34]14,20]. The geometry of the motor used is a significant contributor to the variation seen in Fig.…”

“…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.…”