As stated under the terms of Contract AF49(638)-260, the objec¬tive ot this investigation is to “conduct research in the general field of Observation of Burning Propellants in Rocket Engines”, for the purpose of obtaining design criteria for liquid propellant rockets which will permit a more rational approach to design of rocket engines.nFor this purpose, an experimental method has been developed employing high-speed and magnifying photographic techniques in the follow¬ing way. The light of a high intensity source, flashing at rates up to 10,000/sec, is directed through two windows in opposite walls of a rocket combustion chamber. It produces, by means of a photographic objective, a series of up to ten consecutive magnified shadow pictures of the liquid core of the evaporating or burning propellant droplets and ligaments on a photographic film. Evaluation of these films enables one to follow the time history of the physical phenomena mentioned before which occur in a firing rocket combustion chamber.
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