Meng Yang , Tao Yu , Saiqing Meng , Ming Fang , Xiaolong Fu , Chenglong Tang , Zuohua Huang
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引用次数: 0
Abstract
With good mechanical properties and high specific impulse, nitrate ester plasticized polyether (NEPE) is potentially well suited for future high-energy propulsion systems. In this study, ignition and combustion behaviors of NEPE propellants with different graphene oxide (GO) addition contents were investigated under rapid thermal stimulus using an optical rapid compression machine (RCM). Ignition sensitivity was studied by examining the pressure evolutions and high-speed images at different temperatures and pressures. Results show that the lowest ignition temperature for all NEPE propellants decreases with the increase of pressure. At fixed pressure NEPE propellant without GO (GO0) has the lowest ignition temperature among all propellants, indicating that addition of GO decreases the ignition sensitivity of NEPE propellant. Interestingly, with the increase of GO ratio (GO/(GO + CL-20)) from 0.5 % to 2.0 %, the lowest ignition temperature presents a nonmonotonic increase. The addition of 0.5 % and 1.5 % have excellent desensitized effects, which have the potential to be applied in future propulsion systems. Moreover, the hot spots for all samples locate left or right surface of propellant, strong convective heat transfer by the rapid movement of pistons in RCM occurs. Secondly, the burning rate of GO0 is around 11 mm/s at 40 bar and 940 K, as observed by high-speed images. Note that burning rates are increased by 30–45 % with the addition of GO. In addition, simultaneous thermal analysis (STA) experiments were used to reveal the overall reactivity of the samples and NEPE propellant combustion kinetic process under rapid thermal stimulus was illustrated.
期刊介绍:
The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on:
Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including:
Conventional, alternative and surrogate fuels;
Pollutants;
Particulate and aerosol formation and abatement;
Heterogeneous processes.
Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including:
Premixed and non-premixed flames;
Ignition and extinction phenomena;
Flame propagation;
Flame structure;
Instabilities and swirl;
Flame spread;
Multi-phase reactants.
Advances in diagnostic and computational methods in combustion, including:
Measurement and simulation of scalar and vector properties;
Novel techniques;
State-of-the art applications.
Fundamental investigations of combustion technologies and systems, including:
Internal combustion engines;
Gas turbines;
Small- and large-scale stationary combustion and power generation;
Catalytic combustion;
Combustion synthesis;
Combustion under extreme conditions;
New concepts.