The basic problems of application of detonation process in propulsion systems with impulse and continuous burning of combustible mixture are discussed. The results on propagation of detonation waves in supersonic flow are analyzed relatively to air-breathing engine. The experimental results are presented showing the basic possibility of creation of an engine with exterior detonation burning. The base results on optimization of initiation in impulse detonation engine are explained at the expense of spatial and temporal redistribution of an energy, entered into a mixture. The method and technique for construction of highly effective accelerators for deflagration to detonation transition are discussed also. 1. Introduction The increased interest to use of a detonation process in various technological devices and, in particular, at development of the concept of detonation engine (DE) is stipulated by classical conclusion (e.g., [1]) that from every possible mode of burning of a combustible mixture, the regime of self-sustained detonation (the ideal Chapman-Jouguet wave) is characterized by minimum irreversible losses. The point D (Figure 1) of a tangency of the Michelson-Rayleigh line ODS to a detonation branch 1 of adiabatic curve of energy release = const corresponds to minimum growth of an entropy = min (isentropic curve is tangent to an adiabatic curve from below) in a comparison with any other points. The higher losses are inherent for combustion modes (laminar and turbulent) on a comparison with the C-J detonation mode: the point of a tangency of the Michelson-Rayleigh line OF to lower deflagration branch corresponds to maximum growth of an entropy (in isentropic curve is tangent to an adiabatic curve from above: ). is the first advantage of detonation mode. Figure 1: Typical ( - ), diagram of a combustible mixture. The second advantage is the maximum high pressure of a detonation products on a comparison with traditional combustion, where a final condition is close to point (to be in general agreement with condition = const) or to point (burning at condition = const). Only these two advantages of detonation burning allow to get positive profit at consequent expansion of DW-products. Additional advantage connects with huge velocities of a mixture burning in a detonation wave (DW) and the highest power (energy in unit time) of detonation energy-release, unattainable for combustion conditions. 2. The Basic Scheme of Detonation Engines To the present time for a realization of idea of burning of a combustible mixture in detonation modes, the set of
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