MECHANICS

Experimental investigation and modeling of metallized composite solid propellant combustion with allowance for the size distribution of agglomerates. I. Experiment: methodology, processing, results

V. A. Poryazov^a, O. G. Glotov^b, A. Yu. Krainov^a, D. A. Krainov^c, I. V. Sorokin^b, G. S. Surodin<sup>b

a</sup> Tomsk State University, Tomsk, Russian Federation
^b Voevodsky Institute of Chemical Kinetics and Combustion Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
^c Tomsk Polytechnic University, Tomsk, Russian Federation

Abstract: Characteristics of condensed combustion products (CCPs) of propellants based on AP, aluminum, and the inert binder SKDM-80 with a variation in the dispersion of aluminum were studied by the sampling method. The experiments were carried out in the pressure range of 2-8 MPa in argon, the particles were quenched near the combustion surface. The data on burning rate, morphological and granulometric composition of CCPs, incompleteness of metal combustion and heat release efficiency of metallic fuel are presented. Some empirical factors indicate that the pathways of chemical reactions change with an increase in pressure. In particular, the amount of acidic products in the combustion products increases, and incompleteness of metal combustion also decreases. This leads to an increase in the energy efficiency of metallic fuel at a pressure of about 9 MPa for both propellants; however, propellant with Alex is inferior in this parameter to fuel with ASD-4 due to the higher initial oxidation of Alex powder as compared to ASD-4. The obtained set of experimental data can be used to validate the developed combustion models of aluminized propellants in the second paper of the cycle.

Keywords: composite propellant, aluminum, condensed combustion products, particle, size distribution, combustion completeness, combustion rate.

UDC: 536.46

Received: 06.05.2024

DOI: 10.17223/19988621/92/11