Combustion stability

The circular burner shown in Fig. 27-17 is widely used in horizontally fired furnaces and is capable of firing coal, oil, or gas in capacities as tigh as 174 GJ/h (1.65 X 10 Btii/h). In such burners the air is often swirled to create a zone of reverse flow immediately downstream of the burner centerline, which provides for combustion stability. 

Chemical Reactivity - Reactivity with Water No reaction Reactivity with Common Materials Fire can result by contact of this material with combustibles Stability During Transport Stable Neutralizing Agents for Acids and Caustics Not pertinent Polymerization Not pertinent Inhibitor of Polymerization Not pertinent. 

Finally, there is active interest in developing catalyst systems, both ballistic and polymerization, that would promote combustion stability at high pressures (especially in metal-free systems for smokeless applications) and allow processing lattitude for relatively large motors. The ferric-based systems currently being used fall short of these performance measures. Compounds that form complex structures with the metal chelate to reduce its activity to acceptable levels seem to be most promising. Interestingly, the use of an antibiotic has been cited in this context [19],... 

Nonsteady Burning and Combustion Stability of Solid Propellants, Hrsg. De Luca, L., Price, E. W., Summerfield, M., Progress in Astronautics and Aeronautics, Vol. 143, AIAA, Washington, DC, USA, 1992... 

The combustion stability was increased by porous inserts. The porous layers had enough heat capacity to ignite the spray in the event of flame blow-out due to short interruptions in fuel or air supplies. 

Detonation (Explosion, Deflagration and Combustion), Stability and Instability of. 

K.K. Andreev V.V. Gorbunov, Vsesoyu-znoyeKhimicheskoyeObshchestvo.Zhurnal 8(5), 592(1963) (Effect of pressure on combustion stability of explosives)... 

S.S. Novikov Yu.S. Ryazantsev, Zh-Prikl i TekhnFiz (1965) No 1, 56-61 (On the theory of combustion stability of propellants) 9) B.V. Novozhilov, Ibid, (1965),No 4, 157-60(1965) (Stability criterion for steady-state propellant combustion) 10) I.G. Cameron H.H.M. Pike, "The Instability of an Interface Between Two Fluids under Variable Normal Acceleration , 4thONRSympDeton (1965), PP 305-15 10a) L.A. Elliot, "Calculation of the Growth... 

Panasenkov (18C) has studied the influence of turbulence of the liquid jet on its atomization. With the onset of turbulence the jet becomes shorter and begins to break up. He correlates the drop diameter as a function of the orifice diameter and the Reynolds number. Miesse (12C, 13C) has made a careful investigation of the effect of time lag of jet breakup on combustion stability and has correlated the influence of ambient pressure oscillations on the liquid jet. 

Siloxanes, nevertheless, are used in small amts dissolved in N204 to reduce heat transfer thru rocket motor walls during combustion. The addn of 0.6 to 1.8% siloxane produces a heat-transfer reduction of greater than 30% (Ref 35a). Also, in the patent of Gordon et al (Ref 35b), rocket motor combustion stability is provided by the addn of a siloxane. A propint with a siloxane additive was found to bum with a nearly constant press of 600psig for approx 6 secs, whereas the same propint stabilized with cellulose acetate exhibits two press extremes and a continuously decreasing press after less... 

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