Abstract
Abstract Abstract— Decomposition experiments have been performed on liquid propellants consisting of mixtures of hydroxylammonium nitrate (HAN) and water. Electric discharge initiation was used to produce a propagating, exothermic decomposition wave front, which was then observed by cineshadowgraphy. Experiments were conducted on quiescent HAN-water mixtures of 3.12 to 13.00M HAN in a 1.8 x 1.0mm rectangular strand burner over pressures of 6 to 34 MPa. A lean propagation limit was found to exist at a concentration of between 3.12 and 5.10 M HAN. Measured overall decomposition rates decreased with increased pressure in an unstable manner with instabilities ranging in size from tens of micrometers to the burner width. It was found that the overall decomposition rates were a function of both the HAN concentration and the density ratio, ϱproduct/ϱreactant (which is proportional to pressure), across the decomposition wave. This density ratio ettect is interpreted as affecting the hydrodynamic stability of the ...
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