Induced ignition

Extending the analysis proposed by Femandez-Pello [3], the ignition delay time Afig is given by 

A strong pilot ensures a minimal induction time (At ), but owing to the effect that scale has on the flow, the relative importance of the mixing time Atm sometimes needs to be evaluated [11], thus, the ignition delay time could be presented as 

Mixing is commonly considered to be a fast process when compared with heating of the solid fuel sample therefore, the fuel and oxygen mixture becomes flammable almost immediately after pyrolysis starts. Pyrolysis temperatures and times are thus commonly referred to as ignition temperature (Tig) and ignition delay time (Afig) [10], and Equation 3.7 finally simplifies to 

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In induced ignition engines, still called explosion or spark , several types of combustion are possible. 

K) Zel dovich Kompaneets(1960), 109-32 (Combustion with an induced ignition velocity) 188-91 (Combustion regime of Ditsent Shchelkin for gases in rough pipes)... 

Further in their investigation, Z K have shown that, upon propagation of the detonation wave without additional compression from behind or induced ignition ahead of the front, the adiabat which corresponds to the total liberation of heat (Q) from the chemical reaction should be tangent to the line 01 of Fig A... 

Formaldehyde is produced in the early stages of methane oxidation. It has recently been found that formaldehyde induces ignition in methane-oxygen mixtures 67). 

Sturgis and coworkers (82) measured the relative surface ignition resistance of various pure hydrocarbons by a method based on deposit-induced ignition in a CFR... 

NUMBER OF DEPOSIT-INDUCED IGNITIONS Figure 2. Relative ignition resistance of hydrocarbons... 

The process via which a flame is started is called ignition. There are two types of ignition for gaseous mixtures induced ignition via a hot spot, spark, or a small pilot flame, and... 

J.W. Meyer and A.K. Oppenheim, On the Shock-Induced Ignition of Explosive Gases, 13th Symp. (Int.) Comb. (The Combustion Institute, Pittsburgh, 1971) p. 1153. 

Fig. 5 Physiochemical processes involved in laser-induced ignition of RDX.

The theoretical model and numerical method outlined in the above sections were implemented to study steady-state combustion of nitramine monopropellants [33.34], laser-induced ignition of RDX [39,40], and steady-state combustion of nitramine/GAP pseudo-propellants [37-39]. The analyses were carried out over a broad range of operating conditions. Various important burning and ignition characteristics were investigated systematically, with emphasis placed on the detailed flame structure and the effect of the subsurface two-phase layer on propellant deflagration. 

The entire laser-induced ignition process of RDX in an argon environment has been studied in detail [39,40]. Figure 15 shows the predicted temporal evolution of the temperature field at an incident laser heat flux of 400 W/cm under atmospheric pressure. The initial temperature is 300 K. The interface between the subsurface and gas-phase regions is set to be x = 0, with negative and positive values of the. v-coordinate representing the subsurface and gas phase, respectively. The surface temperature is rapidly increased to 475 K within 1 ms, due to the high intensity of laser heat flux. The profiles for t < 1... 

Fig. 15 Evolution of temperature field during laser-induced ignition of RDX in argon at p = 1 atm and = 400 W/cm ...

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