Advances in Chemical Propulsion by Roy G.D. (ed.)

By Roy G.D. (ed.)

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From the fundamental research carried out in this regard, subsequent control strategies have been formulated. The Presumed Probability Density Function (PPDF) method has been developed and implemented to study flame stabilization in subsonic combustors with flame holders by Sergei Frolov’s group at the N. N. Semenov Institute in Moscow (Chapter 12). Turbulence–chemistry interaction, multiple thermochemical variables, variable pressure, near-wall effects, etc. are taken into account. This method provides an efficient research tool for studying flame stabilization and blow-off in practical combustors enabling transfer of science to technology.

However, heavier hydrocarbons require further systematic study, and the reaction pathways need to be identified. Though heat release and turbulent reacting flows have been widely studied numerically, more accurate models are evolving, and their validation and utilization as a predictive tool are warranted. Active combustion control has received worldwide attention in the past decade. The focus has been on the improvement of mixing and combustion efficiency and reduction of combustion-generated instability.

15. The pathway via the lithio quadricyclane intermediate failed due to an unexpected rearrangement presented in Fig. 16. The oxidative method using C6 H5 I(OAc)2 yielded the desired quadricyclyl azide and the process is being scaled up. In another approach (Fig. 17), the hypervalent iodine Hoffmann rearrangement was carried out on quadricyclyl carboxamides. The reaction shown in Fig. 18 was also studied but to date no positive result has been obtained. 5 SYNTHESIS OF SUBSTITUTED CUBANE Considerable effort has been devoted to the preparation of bridgehead halides from the corresponding acids under decarboxylative halogination conditions [4].

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