Structure and Characteristics of Heterogeneous Detonation.
Final rept. 1 Jul 80-1 Jul 83,
MICHIGAN UNIV ANN ARBOR GAS DYNAMICS LABS
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The emphasis of this research program centered around the structure of heterogeneous detonation waves, inasmuch as this had been found to be very important to the detonation characteristics of heterogeneous mixtures. On the experimental side, a vertical detonation tube was used wherein liquid fuel drops, all of one size, were generated at the top of the tube and allowed to fall vertically into the desired gaseous mixture. A strong blast wave was transmitted into the mixture through use of an auxiliary shock tube. The propagation of the resultant wave was monitored by pressure switches, pressure transducers, and photography. The low vapor pressure liquid fuel, decane 400 micrometer drop size was used for most of the experiments. Attention was given to wave structure, wave velocity, and initiation energy. Three atmospheres 100 O2 40 O260 N2 and air and a number of equivalence ratios were investigated. Holographic pictures and streak photography were employed to study the drop shattering process and the structure of the front. Other experiments investigated the addition of the sensitizer, normal propyl nitrate NPN, to the decane. The important aspect of vapor pressure was studied by heating the entire tube to various elevated temperatures and then noting the effect on detonability.
- Combustion and Ignition