An experimental program to measure the mass flux in the backflow region of a 5-lbf bipropellant thruster at angles up to 147 deg with respect to the plume centerline using temperature-controlled and temperature-compensated quartz crystal microbalances (QCM'S) is presented. The measurements were conducted in a high vacuum cryogenic chamber (Aerospace Chamber 10V) at AEDC. Gaseous helium and liquid helium cryopanels provided a blank-off pressure in the ten to the minus ...
This study was undertaken to determine the feasibility of conducting environmental chamber tests on the physical processes which occur when a solid rocket motor exhaust mixes with the ambient atmosphere. Of particular interest was the interaction between hydrogen chloride, aluminum oxide, and water vapor. The program consisted of three phases: (1) building a small rocket motor and using it to provide the exhaust species in a controlled environment; (2) evaluating ...
A study of the interaction of high-energy molecular beams with various cryosurfaces was conducted in a molecular beam test facility. Spatial distributions of the reflected flux from several samples of typical engineering surfaces showed near-cosine distributions with some evidence of back scattering for roughened surfaces. For high-energy beams and highly polished surfaces there was a well-defined forward lobe of reflected molecules. Energy accommodation coefficients were determined by measuring the velocity ...
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