Experimental study of the conditions for auto- and forced fluctuations of the rate of combustion of a powder

Симоненко, В. Н.; Зарко, В. Е.; Куценогий, К. П.

doi:10.1007/bf00742131

Cited by 33 publications

(4 citation statements)

References 5 publications

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“…Simonenko et al 2 attributed the observed differences to nonequivalence effects; however, the analysis presented in this article shows that even if the equivalence principle holds in the steady state, R q can significantly differ depending on the specific values of T Q and q. Since T 0 and q values were not reported by Simonenko et al 2 a detailed comparison could not be made. Figure 5 shows the effect of the absorption coefficient (K a ) of the solid on R q .…”

Section: Parametric Effects Of Primary Parametersmentioning

confidence: 66%

“…For example, Simonenko et al 2 observed distinct differences in the response between experiments that used either an elevated initial temperature or a higher mean radiant flux primarily to achieve the same burning rate. Simonenko et al 2 attributed the observed differences to nonequivalence effects; however, the analysis presented in this article shows that even if the equivalence principle holds in the steady state, R q can significantly differ depending on the specific values of T Q and q. Since T 0 and q values were not reported by Simonenko et al 2 a detailed comparison could not be made.…”

Section: Parametric Effects Of Primary Parametersmentioning

confidence: 97%

See 1 more Smart Citation

Linear burning rate dynamics of solids subjected to pressure or external radiant heat flux oscillations

Son

Brewster

1993

Journal of Propulsion and Power

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Linearized analysis of burning solids subjected to pressure or external radiant heat flux oscillations results in relatively simple expressions for the burning rate response, particularly when combined with quasisteady gas and surface zone assumptions. In this article, a linear expression for the radiant heat flux response function R q as a function of primary experimental parameters is obtained. The implications of this expression and its relationship to the pressure coupled response function R p are examined. In particular, the linearized effects of the mean radiant heat flux level and in-depth absorption on R q are investigated. The linear response to a series of radiant pulses is also presented to suggest an alternate method of experimentally measuring R q . The effects of nonlinearities are investigated using numerical calculations. It is shown that, in general, the relationship between R p and R q is more complicated than a constant scaling factor. The results demonstrate that in-depth absorption of the thermal radiant energy in the solid significantly affects R q for many practical conditions. Furthermore, even when the equivalence principle holds in the steady case, an equivalent change in the initial temperature does not have the same effect on R q , in general, as an equivalent mean radiant flux. Also, the mean radiant flux is seen to have a significant effect on R q . An attempt is made throughout this article to further clarify the relationship and differences between the flame modeling (FM) and the Zeldovich-Novozhilov (ZN) phenomenological approaches in the prediction of R q and R p .f b i most general form is 1/[(T S -r 0 )(d A = Ilk most general form is 1/[(T S -T 0 )(d fa, = Ilk* specific heat of condensed phase specific heat of gas phase activation energy (f b la c )[T s (p, r b ) -T 0 (p, r b )] fraction of q absorbed below surface reaction zone = radiant heat flux frequency response function, = dimensionless heat release, QJC(T S -T 0 ) dimensionless mean radiant flux, qlpf b C(T s -T 0 ) absorption coefficient of condensed phase material (f, -r 0 )(3 A VWo) M -o = (f s ~ T 0 )tr p ; also thermal conductivity (f s -T 0 )(d^f b /dT 0 ) ptq = (f, -T 0 ) /Arj S T TF t X x z a d 8, 8* T) 0 A = burning rate = reflectivity of condensed phase material = (dT s /dT 0 ) p , q = (f, -r 0 )/[f, -T 0 -(qf r /pf b C)] = temperature = time = length scale = spatial coordinate = -i + i(l + 4/ft) 1/2 = thermal diffusivity = temperature exponent in surface pyrolysis expression = ratio of thermal to radiant length scale (K a a c /f b ) = denotes an oscillatory value = vr -jjik = v q r* -iJL q k* -v*r* _ JJL*^* = dimensionless pressure, pip = dimensionless temperature, (T -T 0 )/(T S -T 0 ) = 2 + 2(1 V = _ ll(f s -T 0 )(dT s /d (d £tf...

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Section: Parametric Effects Of Primary Parametersmentioning

confidence: 66%

Section: Parametric Effects Of Primary Parametersmentioning

confidence: 97%

Linear burning rate dynamics of solids subjected to pressure or external radiant heat flux oscillations

Son

Brewster

1993

Journal of Propulsion and Power

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“…A perturbd Amhenius-type relationshi CM be assumed for the pyrolysis and perturbed to obtain:p7.1420 (9) where E = (a, + EIRT,) and the pressure dependence is neglected (n, = 0). Alternatively.…”

Section: Discussionmentioning

confidence: 99%

Measurement of propellant combustion response to sinusoidal radiant heat flux

Finlinson¹,

Hanson‐Parr²,

Son³

et al. 1991

29th Aerospace Sciences Meeting

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“…This has given in the past the reason for several authors to consider lowering the initial temperature as a cause of loss of the combustion stability [9,11,14]. However, visualization of double base propellant combustion at atmospheric pressure shows the existence of macroscopic active reaction spots on the burning surface that becomes most pronounced at low ambient temperatures [15]. Therefore, the pulsations of the temperature profile at these operating conditions are of the local character.…”

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confidence: 99%

Critical Review of Phenomenological Models for Studying Transient Combustion of Solid Propellants

Зарко

Gusachenko

2010

International Journal of Spray and Combustion Dynamics

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A brief review of the existing generalizations of phenomenological model of solid propellants combustion, originally formulated by Ya. B. Zel'dovich in 1942, is presented. The model still remains valid and allows the description of different patterns of solid propellant transient combustion. However, over the years after this formulation was published, several publications appeared in the literature with assumptions that are not justified. Shortcomings of different model options and their limits of applicability are discussed. In fact, in some cases the attempts of model generalization are based on rather strong additional assumptions that lead to narrowing the applicability range of the model.

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Experimental study of the conditions for auto- and forced fluctuations of the rate of combustion of a powder

Cited by 33 publications

References 5 publications

Linear burning rate dynamics of solids subjected to pressure or external radiant heat flux oscillations

Linear burning rate dynamics of solids subjected to pressure or external radiant heat flux oscillations

Measurement of propellant combustion response to sinusoidal radiant heat flux

Critical Review of Phenomenological Models for Studying Transient Combustion of Solid Propellants

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