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

Medvedev, V. V.; Tsipilev, V. P.; Forat, Egor

doi:10.1002/prep.201700191

Cited by 3 publications

(7 citation statements)

References 18 publications

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“…Reagent-grade AP was milled in an agate mortar and sieved through a Capron sieve with a mesh size of 85 × 85 mm. Aluminum powder with a particle means the diameter of 0.14 μm was prepared by electric explosion of Al wire [10]. Nd : Glass laser with a wavelength of 1.06 μm and a pulse duration of 1 ms, operating in the free-running mode, was chosen as a laser radiation source [15].…”

Section: Methodsmentioning

confidence: 99%

“…The samples were prepared by pressing in a manual hydraulic press at the pressure needed to achieve the required density. The samples for ignition through an open surface were compacted in a metal mold, and those, to perform ignition through a covered surface, were pressed into a PMMA capsule [10].…”

Section: Methodsmentioning

confidence: 99%

“…During exposure of the compacted AP/nAl samples to laser radiation, the reaction volume is limited by the size of the laser beam spot on the sample surface, light penetration depth, and thermal front propagation length within the laser pulse duration [10,16]. In the case of uncovered samples ignition, the heat dissipation into the air is considered negligible in regard to the heat dissipation into the sample.…”

Section: Effect Of Heat Dissipation Into Pmmamentioning

confidence: 99%

“…In our earlier work [10], we considered the issue of pulsed laser ignition of a pressed mixture of AP and nanosized Al powder (nAl), both open in the air and confined into a polymethyl methacrylate (PMMA) capsule. The obtained results (Figure 1) show that the ignition thresholds of the confined samples are significantly higher than those obtained for uncovered samples ignited in the air within a wide density range (400-1600 kg/m 3 ).…”

Section: Introductionmentioning

confidence: 99%

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Laser Ignition of Ammonium Perchlorate/Aluminum Composition Confined into PMMA Capsule

Tsipilev

Forat

Medvedev

et al. 2022

Propellants Explo Pyrotec

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A two-component composition of ammonium perchlorate and nanosized aluminum powder can be ignited by millisecond Nd laser radiation. However, the mixture exposed to laser radiation pulse through polymethyl methacrylate (PMMA) capsule demonstrates less sensitivity when compared to ignition of the uncovered sample. Such behavior is uncommon to gasified energetic materials. It is shown that the sensitivity of uncovered samples does not change if the surrounding atmosphere is changed from air to argon. It was found that the cover of PMMA decreases the sensitivity of the mixture due to heat dissipation from the ignition zone, thereby reducing its reactivity.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Effect Of Heat Dissipation Into Pmmamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser Ignition of Ammonium Perchlorate/Aluminum Composition Confined into PMMA Capsule

Tsipilev

Forat

Medvedev

et al. 2022

Propellants Explo Pyrotec

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Yan

Xia

Huang

et al. 2020

International Journal of Aerospace Engineering

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In this study, a CO2 laser ignition experimental system was built to study the ignition process and characteristics of the Nitrate Ester Plasticized Polyether (NEPE) propellant. The effect of the energy density, ingredients, and the grain size distribution of the propellant on the ignition process was investigated using a CO2 laser igniter, a high-speed camera, and a tungsten-rhenium thermocouple. Four types of NEPE propellants were tested under different laser heat fluxes, and the ignition delay time, the ignition temperature, and the ignition energy were obtained. Experimental results show that the ignition process of the NEPE propellant can be divided into three stages, namely the first-gasification stage, the first-flame stage, and the ignition delay stage. When the energy density is lower than the ignition energy threshold, the ignition process cannot be achieved even under continuous energy loading. The increase of the energy density can lead to the decrease of the ignition delay time but has little effect on the ignition temperature. The ingredients and grain size distribution have great effects on both the ignition delay time and the ignition temperature. The grain size effect of aluminum is the largest compared with that of Ammonium Perchlorate (AP) and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), while the grain size effect of AP is larger than that of HMX.

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Thermal Decomposition, Ignition Process and Combustion Behavior of Nitrate Ester Plasticized Polyether Propellant at 0.1–3.0 MPa

Feng²,

Ling³

et al. 2022

International Journal of Aerospace Engineering

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Nitrate ester plasticized polyether (NEPE) propellant is widely used in solid rocket motors, having both good mechanical properties and high specific impulse. However, its ignition and combustion process are complex and need to be better understood. In this study, a high-pressure sealed combustion chamber was constructed, a thermogravimetry-differential scanning calorimetry was used to investigate the thermal decomposition process, and a high-speed camera was used to capture the ignition process and combustion behavior of the propellant. The results showed that the thermal decomposition process of this propellant could be divided into two stages. The first stage (50–350°C) was the major mass loss stage and exhibited typical features of BTTN, RDX, and AP decomposition. The second stage (350–500°C) was mainly accompanied by decomposition of the remaining components as well as slight oxidation of aluminum particles. The ignition process of NEPE propellant was divided into four stages, including the inert heating period stage, thermal decomposition stage, initial flame stage, and stable combustion stage. After the propellant absorbed heat, the propellant started to pyrolyze and gasify to generate flammable gas. When the temperature of the propellant surface reached the flammable gas ignition point, an initial flame was generated on the surface, which spread rapidly, covering the surface. The ignition delay time of the propellant was measured by a signal acquisition system, and a mathematical model was then established for the ignition delay time. The results showed that the ignition delay time decreased with increased laser heat flux and ambient pressure. Finally, the Vielle burning rate empirical formula was used to fit the burning rate data for the propellant. The resulting good fit was consistent with experimental measurements and showed that the formula was valid for predicting the NEPE propellant burning rate under 0.1–3.0 MPa nitrogen.

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

Cited by 3 publications

References 18 publications

Laser Ignition of Ammonium Perchlorate/Aluminum Composition Confined into PMMA Capsule

Laser Ignition of Ammonium Perchlorate/Aluminum Composition Confined into PMMA Capsule

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

Thermal Decomposition, Ignition Process and Combustion Behavior of Nitrate Ester Plasticized Polyether Propellant at 0.1–3.0 MPa

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