Calculation of the characteristics of agglomerates during combustion of high-energy composite solid propellants

Babuk, V. A.; Ivonenko, A. N.; Nnizyaev, A. A.

doi:10.1134/s0010508215050056

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…As only coarse fraction typically results in significant two phase flow losses, stage treatments for the products of P 0 and propellant P PF2 were carried out in a way similar to Price et al [57] to sieve products larger than 10 mm on which morphology and size distribution were determined shown in Figure 6 and Figure 7, respectively. It is obvious that the residue of propellant P 0 comprise much large spheres, which are mainly Al and Al 2 O 3 and have been studied as CCP in many works [10,13,58,59]. While it is much smaller for slag of propellant P PF2 as shown in Figure 6b.…”

Section: Ptfe-cmdb Propellant Agglomeration Reductionmentioning

confidence: 98%

Applying Mechanically Activated Al/PTFE in CMDB Propellant

Sun

Zhao

Zhang

et al. 2018

Propellants Explo Pyrotec

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A novel reactive powder (aluminum/polytetrafluoroethylene, Al/PTFE 75/25 mass %) containing two kinds of PTFE (pre-sintering PTFE and fresh PTFE, P-PTFE and F-PTFE) was prepared by a two-step mechanical activation (MA) method. By introducing it into composite modified double base (CMDB) propellant, an attempt to improve the propellant performance of this mechanically activated Al/ PTFE was made. Scanning electron microscopy (SEM) characterization indicated that F-PTFE in activated powders deformed to abundant fibers under uniform shear forces. These fibers significantly enhanced propellant tensile properties and show improved safety performance. Compared to blank CMDB propellant (without PTFE), the elongation at maximum strength for propellant with activated Al/PTFE in-clusions was increased to 3.7 times at À40 8C and to 3.9 times at À70 8C, the friction sensitivity and impact sensitivity were reduced by 88.9 % and 20.4 %, respectively. P-PTFE in activated powders promoted the Al reaction activity, thereby reducing the propellant combustion agglomeration. The average diameter (D 50 ) of coarse products for propellant with activated Al/PTFE 75/25 mass-% was reduced by 82 % compared to that of blank CMDB propellant with spherical aluminum. This novel activated Al/PTFE shows increased propellant mechanical performance, decreased sensitivity and improved combustion efficiency of Al, which might expand the application field of CMDB propellants.

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Section: Ptfe-cmdb Propellant Agglomeration Reductionmentioning

confidence: 98%

Applying Mechanically Activated Al/PTFE in CMDB Propellant

Sun

Zhao

Zhang

et al. 2018

Propellants Explo Pyrotec

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“…In spite of the non-spherical shape of propellant particulates (especially AP particles), they are uniformly represented as spherical particles for the purpose of simplifying the analysis and calculation. A viscous suspension method (VSM) is used to maximize particle filling efficiency in this study and an ensemble rearrangement is used for determining particle spatial positions [23]. Figure 2e shows the geometric topology of solid propellant constructed by the above method.…”

Section: Methodsmentioning

confidence: 99%

“…Despite the agglomeration models mentioned above, few studies have attempted to develop a prediction model for CCPs. Babuk [23] has made pioneering contributions by proposing a mathematical model of CCP formation and evolution in the motor chamber. A detailed discussion was made of the physico-chemical transformation, particle size, chemical composition, and structure of the particles.…”

Section: Introductionmentioning

confidence: 99%

Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Yue

Liu

et al. 2023

Aerospace

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Solid propellant combustion and flow are significantly affected by condensed combustion products (CCPs) in solid rocket motors. A new aluminum agglomeration model is established using the discrete element method, considering the burning rate and formulation of the propellant. Combining the aluminum combustion and alumina deposition model, an analytical model of the evolution of CCPs is proposed, capable of predicting the particle-size distribution of completely burned CCPs. The CCPs near and away from the propellant burning surface are collected by a special quench vessel under 6~10 MPa, to verify the applicability of the CCP evolution model. Experimental results show that the predicted error of the proposed CCP evolution model is less than 8.5%. Results are expected to help develop better analytical tools for the combustion of solid propellants and solid rocket motors.

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“…The agglomeration model [5,6] can be used to determine the properties of emerging agglomerates at burning propellant surface. The model is based on considering of agglomeration regularities depending on propellant type, modeling of initial propellant structure, and modeling of evolution of enlarging agglomerating particles on propellant surface.…”

Section: Agglomerates Parameters On Surface Of Burning Propellantmentioning

confidence: 99%

“…In the present work, previously developed models of agglomerates formation [5,6] and their evolution [7] are used for calculation of agglomerates parameters. The main feature of these models is the ability to calculate not only sizes and mass fraction of agglomerates but also chemical composition and structure parameters.…”

Section: Introductionmentioning

confidence: 99%

Modeling of agglomerates formation and evolution at combustion of aluminized propellants in intra-chamber environments

Babuk

Nizyaev

2017

MATEC Web Conf.

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Abstract. In the present paper, the solution of the problem of agglomerates parameters calculation in combustion chamber environments is described. For this, a method of two-dimensional axisymmetric multiphase quasistationary flow calculation has been developed. The method uses previously developed models of agglomerates formation and their evolution within multiphase flow with considering of interactions between agglomerates and gaseous combustion products. Parametric study of the developed models with respect to intra-chamber environments has been performed.

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Calculation of the characteristics of agglomerates during combustion of high-energy composite solid propellants

Cited by 14 publications

References 8 publications

Applying Mechanically Activated Al/PTFE in CMDB Propellant

Applying Mechanically Activated Al/PTFE in CMDB Propellant

Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Modeling of agglomerates formation and evolution at combustion of aluminized propellants in intra-chamber environments

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