Nonsteady Burning and Combustion Stability of Solid Propellants

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The numerical technique based on the method of operator-splitting, used to solve the governing equations is described. In Chapter 3, the effect of relaxing the QSG assumption on the intrinsic instability is investigated. The stable and unstable solutions are obtained for parameters corresponding to a typical composite propellant.

The stability boundary, in terms of the nondimensional parameters identified by Denison and Baum , is predicted using the present model. It is found that in the limit of large activation energy and low frequencies, present result approaches the previous theoretical results.

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This serves as a validation of the present method of solution. It is confirmed that relaxing the QSG assumption widens the stable region.

Mod-12 Lec-49 Combustion Instabilities

However, it is found that a distributed reaction in the gas-phase destabilizes the burning. The effect of non-unity Lewis number on the stability boundary is also investigated. It is found that at parametric values corresponding to low pressures and large flame stand-off distances, small amplitude, high frequency at frequencies near the characteristic frequency of the gas-phase oscillations in burning rate appear when the Lewis number is greater than one.


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In Chapter 4, the effect of relaxing the QSG assumption is further investigated with respect to the pressure-driven dynamic burning. Comparison of the pressure-driven frequency response function, Rp, obtained with the present model, both in the QSG and non-QSG framework, with those obtained with previous linear stability theories invoking QSG and QSC assumptions are made.


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  • As the frequency of pressure oscillations approaches zero, RP predicted using present models approached the value obtained by previous theoretical studies. Washington, D. Request this item to view in the Library's reading rooms using your library card. To learn more about how to request items watch this short online video. You can view this on the NLA website. Login Register.

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    Prediction of longitudinal combustion instability in a solid-propellant rocket motor

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      Prediction of longitudinal combustion instability in a solid-propellant rocket motor

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