Application of an Inverse Method for the Estimation of Heat Flux in Low-Thrust Hybrid Propellant Rocket Motor and Its Analytical Validation

Experimental Study of The Insulating Effectiveness of Silicone Rubber Composites by Oxyacetylene Ablation Testing

“…For a fire testing, the holder is displaced manually to upper position and the tip of lateral thermocouple passes through the flame determining a starting point of burning time. Since the heat fluxes in low-thrust hybrid propellant motors are moderate (Nunes et al 2017), the welding torch (whose characteristics are given in Table 3) adopted for the test-bench had been selected on the basis of the relatively low heat flux. The same settings were used for all tests: the length of internal cone of the neutral flame was 9 mm, the distance between front face of specimen and torch tip was 9 mm.…”

“…The objective of the presented study is to fill the data gap in the range of moderate heat fluxes 0.01-0.1 MW/m 2 , which are inherent to low-thrust hybrid propellant motors (Nunes et al 2017). The back-face temperature measurements are used as a criterion for insulation efficiency of the silicone rubber specimens, whose frontal face is subjected to oxyacetylene flame for 40 s. The specimens were reinforced with four types of widely available fabrics and tapes based on glass, carbon, ceramics and silica fibers.…”