Abstract
A brief literature survey of references investigating bipropellant thruster contamination is presented in the context of formulating a nascent theory regarding the circumstances of its formation. It is postulated that the key to monomethylhydrazinium nitrate deposit formation is the overwhelming presence of water vapor, a major combustion product, on the surface. In a surface mediated chemical reaction, this surface water first facilitates the conversion of unburned oxidizer (nitrogen tetroxide) into nitric acid, which then combines with unburned fuel (monomethyl hydrazine) to create an extremely hygroscopic fuel nitrate deposit. Furthermore, if reactant distribution within the expanding plume is governed by a free molecule species separation effect, the condensation coefficient associated with the contaminant may be strongly dependent on the transport of the heaviest reactant, nitrogen tetroxide, to the surface.
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