Conditions of Millisecond Laser Ignition and Thermostability for Ammonium Perchlorate/Aluminum Mixtures

Abstract

The experimental investigations of laser‐induced ignition and heat action of ammonium perchlorate and aluminum powder mixtures are presented in this paper. A laser pulse with wavelength of 1.06 μm and duration of 3.5 ms was used. Powder mixtures of different dispersion were tested, namely, coarsely dispersed powders and nanopowders with average surface diameters of 80 and 0.25 μm, respectively. The values of ignition thresholds and delays of the mixtures activity in air were measured, and experimental results for different exposure conditions were obtained. The possible reasons of different sensitivity for the given mixtures to laser pulse and heat action are discussed.

The effect of aluminum particles dispersity on characteristics of ammonium perchlorate—aluminum composition laser ignition

“…The ET is 1.3 J/ cm 2 and the ignition delay amount to 15 ms. That results corresponding the obtained one from the work [3].…”

“…It was previously ascertained that ignition characteristics of such mixtures, on top of everything else, can depends on the size of Al particles [3]. The sensitivity to laser pulse (pulse duration 4 ms) comparison between AP mixtures with ultrafine (UF) Al (size of one particle d = 0.25 µm) and coarse Al (d = 80 µm) was conducted.…”

Effect of Ammonium Perchlorate and Aluminum Composition Density on Characteristics of Laser Ignition

“…For each point of this function, 20 experiments were conducted. The ignition threshold was assumed to be the E TR value, for which the ignition took place with the possibility P = 0.5 [20]. The range of probable ignition was taken as the confidence interval DE.…”

Study on the Ignition Process and Characteristics of the Nitrate Ester Plasticized Polyether Propellant

“…Monagheddu et al [14] studied the different role of ignition temperature in combustion synthesis through self-propagating high-temperature synthesis (SHS) and thermal explosion (TE) mode. Medvedev et al [15,16] studied the dependence of the laser ignition energy threshold energy density on the sample density and dispersion using pulse laser and explained their results in terms of the thermal ignition theory. Demko et al [17] measured the ignition delay time at the pressure between 3.5 MPa and 15.5 MPa using a CO 2 laser igniter and studied the effect of novel nanoaddictive catalysts on the ignition delay time.…”