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The micro-behaviours of shock ignition of epoxypropane were studied by OMA (optical multii channal system) and monochromator techniques. The radicals O, CH2O, C2, CH, CH3O, CO2 and H2O were observed by OMA spectrometer. The delay time and critical condition of shock ignition were determined using three monochromators and gauge. The emergence of intermediate product of O for epoxypropane after shock ignition is always the earliest.
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Phys Rev Lett
July 2025
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA.
Recent advancements in indirect-drive inertial confinement fusion (ICF) experiments at the National Ignition Facility (NIF) have achieved a significant milestone by demonstrating target gains greater than one, yet future applications necessitate much higher target gains. One approach to achieving improved implosion performance is to pursue increased fuel compression via a lowered implosion adiabat. Experiments have been performed testing a reduced adiabat by introducing small changes to the drive laser pulse shape and the resulting shock timing for an existing implosion design at 1.
View Article and Find Full Text PDFPhys Chem Chem Phys
July 2025
Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China.
In this study, a 3D-DEM was employed to model an HMX explosive containing a large void oriented at 45°. The effects of hammer height, particle size, and void size on HMX detonation were systematically investigated. The detonation was observed at hammer drop heights of 0.
View Article and Find Full Text PDFACS Omega
May 2025
School of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China.
In this study, experiments were conducted to investigate the electric explosion initiation of composite energetic materials (CEMs) by using Cu and NiCr wires in water. The composite energetic material is composed of Al powder and a heater, and there are three formulations after mixing according to the mass ratio (1:1, 1:2, and 1:4). Metal wires with a diameter of 0.
View Article and Find Full Text PDFEnergy Fuels
March 2025
J. Mike Walker '66 Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843, United States.
Bis(2,2,2-trifluoroethyl) carbonate (BtFEC) is a fire suppressant candidate for the use of lithium-ion batteries (LIBs). It is known that the electrolyte components in LIBs are highly flammable, making them susceptible to igniting, whether this is due to a manufacturing fault or an abuse of the LIB itself. To address this risk, the efficiency of BtFEC as a fire suppressant was investigated experimentally in a high-temperature combustion environment, allowing for further refinement and validation of the model.
View Article and Find Full Text PDFJ Mol Model
March 2025
State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, P. R. China.
Context: The formation of hot spots and chemical decomposition of explosives under shock loading are crucial for understanding the initiation of heterogeneous explosives. In this study, molecular dynamics simulations were employed to investigate the collapse of nanovoids, hotspot formation, and decomposition reactions of HMX under four typical stress wave loadings: long-pulse, short-pulse, triangular wave, and ramp wave. Different loading modes lead to varying critical transition velocities at which void collapse shifts from uniform to jetting collapse.
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