《Wilson_Ejectors》.pdf

st 41 AIAA/ASME/SAE/ASEE Joint Propulsion Conference AIAA–2005–4208 Tucson, Arizona, July 10–13, 2005 Parametric Investigation of Thrust Augmentation by Ejectors on a Pulsed Detonation Tube * † Jack Wilson and Alexandru Sgondea QSS Group, Inc. ‡ § Daniel E. Paxson and Bruce N. Rosenthal National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio 44135 A parametric investigation has been made of thrust augmentation of a 1 inch diameter pulsed detonation tube by ejectors. A set of ejectors was used which permitted variation of the ejector length, diameter, and nose radius, according to a statistical design of experiment scheme. The maximum augmentations for each ejector were fitted using a polynomial response surface, from which the optimum ejector diameters, and nose radius, were found. Thrust augmentations above a factor of 2 were measured. In these tests, the pulsed detonation device was run on approximately stoichiometric air-hydrogen mixtures, at a frequency of 20 Hz. Later measurements at a frequency of 40 Hz gave lower values of thrust