Ignition of model composite propellants by a single particle heated to high temperatures

Abstract

This paper describes the technique and results of an experimental study of the ignition of condensed materials (model composite propellants) by a hot single metal particle. The dependence of the ignition delay of condensed materials (CMs) on the initial particle temperature is investigated. The mechanism of interaction of a single particle heated to high temperatures with unmetallized and metallized CMs is analyzed. It is found that the presence of a metallic filler in the CM changes the absolute values of the ignition delay and the relative characteristics of their spread.

The ignition fragment wood heated to a high temperature of the plate

“…It should be noted that at large Ɍ 0 the errors of determination of τ ign (do not exceed ± 5 %) go dropping considerably. The established regularities can be explained with the use of hypotheses and models formulated in [7][8][9][10][11][12] according to the results of the performed experiments.…”

“…It should be noted that the results of the experimental [7][8][9][10] and theoretical [11][12][13] studies ignition solid [7,9,10] and liquid [11,14] condensed substances (CS) is set to a number of significant features of the ignition mechanisms when local heating arising from the specific heat exposure. Singling out the general regularities of ignition, established in [7][8][9][10][11][12][13][14], we can conclude that the obtained results of experimental studies in inpatient intensive heating of the kinetic parameters of the process do not meet the conditions of local heating of a condensed substance by a source of limited capacity. Therefore, most likely, the induction period during local thermal impact is significantly different from the delay time of ignition under standard conditions [15].…”

Experimental study of the form of “hot” steel particles on the ignition characteristics of liquid fuels

“…Research used the experimental setup [6], whose main elements are heating furnace and the controlmeasuring installation. When planning the experiment was chosen as the most typical pattern: the metal particle falls perpendicular to the surface of the liquid at a low speed -no more than 1.7 m/s.…”

Numerical research of heat and mass transfer at the ignition of system “fabric – combustible liquid – oxidant” by the local energy source

“…Mathematical model (analog [1][2][3][4][5][6][7][8][9][10]) describe the interrelated processes of heat transfer in fabric, evaporation of combustible liquid, diffusive and convective heat and mass transfer and oxidation in the gas phase was represented by the system of non-stationary differential equations. It system with initial and boundary conditions was solved by the finite difference method.…”

“…Numerical investigations of heat and mass transfer processes at the ignition of solid [1][2][3][4], liquid [5][6][7][8] condensed substances and polymer materials [9,10] by local energy source with limited power consumption (metallic and non-metallic particles, wires, cores, concentrate radiation flows and etc.) was held in recent years.…”