Detonation interaction with a diffuse interface and subsequent chemical reaction |
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Authors: | D H Lieberman J E Shepherd |
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Institution: | (1) Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA, USA;(2) Present address: Exponent Failure Analysis Associates, Los Angeles, CA, USA |
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Abstract: | We have investigated the interaction of a detonation with an interface separating a combustible from an oxidizing mixture.
The ethylene-oxygen combustible mixture had a fuel-rich composition to promote secondary combustion with the oxidizer in the
turbulent mixing zone that resulted from the interaction. Diffuse interfaces were created by the formation of a gravity current
using a sliding valve that initially separated the test gas and combustible mixture. Opening the valve allowed a gravity current
to develop before the detonation was initiated. By varying the delay between opening the valve and initiating the detonation
it was possible to achieve a wide range of interface conditions. The interface orientation and thickness with respect to the
detonation wave have a profound effect on the outcome of the interaction. Diffuse interfaces result in curved detonation waves
with a transmitted shock and following turbulent mixing zone. The impulse was measured to quantify the degree of secondary
combustion, which accounted for 1–5% of the total impulse. A model was developed that estimated the volume expansion of a
fluid element due to combustion in the turbulent mixing zone and predicted the resulting impulse increment.
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Keywords: | Detonation Diffuse interface Secondary combustion |
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