By M.A. Nettleton
My advent to the interesting phenomena linked to detonation waves got here via appointments as an exterior fellow on the division of Physics, college university of Wales, and on the division of Mechanical Engineering, collage of Leeds. Very unique thank you for his actual tips during the huge physique of knowledge on gaseous detonations are because of Professor D. H. Edwards of college collage of Wales. certainly, the exhausting job of concisely enumerating the foremost positive aspects of unidimensional theories of detonations used to be undertaken by way of him, and bankruptcy 2 is predicated on his preliminary draft. while the textual content strays to using we, it's a deserved acknow ledgement of his contribution. back, I may still prefer to thank Professor D. Bradley of Leeds collage for his enthusiastic encouragement of my efforts at constructing a version of the composition limits of detonability via a courting among run-up distance and composition of the aggregate. The textual content has been ready within the context of those fellowships, and i'm thankful to the relevant electrical energy producing Board for its permission to just accept those appointments.
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Extra resources for Gaseous Detonations: Their nature, effects and control
S. Although the possibility of overshoot in pressure transducers must be borne in mind, it now seems well established that local pressure ratios in excess of those predicted by unidimensional theories occur in spinning fronts [14,64,82]. Indeed, it appears that the more complex the front, the higher the local pressure produced. For instance, it will be recalled that the calculated pressure ratio across a trailing triple point of the complex front occurring in mixtures of carbon monoxide and oxygen diluted with argon is as high as 160.
J a: en ~ ::;) ~. ,.. 3 Influence of initial pressure and diluents on spin in oxyhydrogen detonations (after Gordon et al. ). 5 !! 5 j:: ;:J. 5 ... j::>. 2) Thus, the higher speed of sound in mixtures diluted with helium might be expected to lead to spin of short wavelength, not long wavelength as observed. 4 .. 2 '" I I I ~. 4 Influence of argon dilution of stoichiometric oxyhydrogen mixtures on wave velocity and spin-regime (after Munday et al. ). Further confirmation of the effects of increasing the dilution of oxyhydrogen mixtures in promoting single-headed spin comes from an elegant set of experiments in which the velocities of the front were measured using conventional ionization probes .
0 ~. ~~~ ~ "~'D'o '" '", . : Cl 9 G3 1-kL"":::===:::" G4 G --SOjJS(b) workers systematically investigated the phenomenon. They found it produced spiral cracking of glass tubes and etched a single helical track on the silvered surface of a tube [69-71]; they also found that neither the crosssection of the tube nor the insertion of a 1 mm ridge along the length of a 12 mm bore detonation tube had any effect on the phenomenon. Interestingly however, Bone et al. discovered that intense electrical fields did lead to irreproducible effects on both spin and the velocity of the wave.