Energetic Semiconductor bridge(ESCB)based on reactive multilayered films(RMFs)has a promising application in the miniature and intelligence of initiator and pyrotechnics device.Understanding the ignition enhancement m...Energetic Semiconductor bridge(ESCB)based on reactive multilayered films(RMFs)has a promising application in the miniature and intelligence of initiator and pyrotechnics device.Understanding the ignition enhancement mechanism of RMFs on semiconductor bridge(SCB)during the ignition process is crucial for the engineering and practical application of advanced initiator and pyrotechnics devices.In this study,a one-dimensional(1D)gas-solid two-phase flow ignition model was established to study the ignition process of ESCB to charge particles based on the reactivity of Al/MoO_(3) RMFs.In order to fully consider the coupled exothermic between the RMFs and the SCB plasma during the ignition process,the heat release of chemical reaction in RMFs was used as an internal heat source in this model.It is found that the exothermal reaction in RMFs improved the ignition performance of SCB.In the process of plasma rapid condensation with heat release,the product of RMFs enhanced the heat transfer process between the gas phase and the solid charge particle,which accelerated the expansion of hot plasma,and heated the solid charge particle as well as gas phase region with low temperature.In addition,it made up for pressure loss in the gas phase.During the plasma dissipation process,the exothermal chemical reaction in RMFs acted as the main heating source to heat the charge particle,making the surface temperature of the charge particle,gas pressure,and gas temperature rise continuously.This result may yield significant advantages in providing a universal ignition model for miniaturized ignition devices.展开更多
The plasma temperature of the semiconductor bridge (SCB) was measured in real-time according to relative intensity ratio of dual lines of atomic emission spectrum.The plasma temperature under different discharge pulse...The plasma temperature of the semiconductor bridge (SCB) was measured in real-time according to relative intensity ratio of dual lines of atomic emission spectrum.The plasma temperature under different discharge pulses and the influence of discharge pulse energy on it were studied.The results show that the plasma peak temperature rises gradually with the increase of initial discharging voltage and charging capacitance.For the capacitance of 22 μF,if the initial discharging voltage increases from 21 V to 63 V,the plasma peak temperature rises from 2 000 K to 6 200 K.For the discharging voltage of 39 V,the peak temperature rises from 2 200 K to 3 800 K when the capacitance increases from 6.8 μF to 100 μF.The change of pulse discharge has a very small effect on the plasma temperature at the late time discharge (LTD).In view of the change of plasma temperature with the pulse energy,the discharging voltage has a greater effect on the plasma temperature than the capacitance.The results provide some experimental basis for the further research on SCB ignition and detonation mechanisms.展开更多
Enhancing the output capacity of semiconductor bridge(SCB)through the application of composite nano-energetic films is a subject of wide concern.Furthermore,improving the safety,reliability,and production efficiency o...Enhancing the output capacity of semiconductor bridge(SCB)through the application of composite nano-energetic films is a subject of wide concern.Furthermore,improving the safety,reliability,and production efficiency of energetic semiconductor bridge(ESCB)is the primary focus for large-scale engineering applications in the future.Here,the Al/CuO nano-film ESCB was efficiently fabricated using 3D direct writing.The electrostatic safety of the film is enhanced by precisely adjusting the particle size of Al,while ensuring that the SCB can initiate the film with small energy.The burst characteristics of SCB/ESCB were thoroughly investigated by employing a 100 mF tantalum capacitor to induce SCB and ESCB under an intense voltage gradient.The solid-state heating process of both SCB and ESCB was analyzed with multi physical simulation(MPS).The experimental results demonstrate that the critical burst time of both SCB and ESCB decreases with increasing voltage.Under the same voltage,the critical burst time of ESCB is longer than that of SCB,primarily due to differences in the melting to vaporization stage.The MPS results indicate that the highest temperature is observed at the V-shaped corner of SCB.Due to the thermal contact resistance between SCB and the film,heat conduction becomes more concentrated in the central region of the bridge,resulting in a faster solid-state heating process for ESCB compared to SCB.The results of the gap ignition experiments indicate that at a 19 mm gap,an ESCB with a film mass of 10 mg can ignite nickel hydrazine nitrate(NHN)and cyclotrimethylenetrinitramine(RDX).This suggests that thermite ESCB can serve as a novel,safe,and reliable energy exchange element and initiator in largescale engineering applications.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.22275092,52102107 and 52372084)the Fundamental Research Funds for the Central Universities(Grant No.30923010920)。
文摘Energetic Semiconductor bridge(ESCB)based on reactive multilayered films(RMFs)has a promising application in the miniature and intelligence of initiator and pyrotechnics device.Understanding the ignition enhancement mechanism of RMFs on semiconductor bridge(SCB)during the ignition process is crucial for the engineering and practical application of advanced initiator and pyrotechnics devices.In this study,a one-dimensional(1D)gas-solid two-phase flow ignition model was established to study the ignition process of ESCB to charge particles based on the reactivity of Al/MoO_(3) RMFs.In order to fully consider the coupled exothermic between the RMFs and the SCB plasma during the ignition process,the heat release of chemical reaction in RMFs was used as an internal heat source in this model.It is found that the exothermal reaction in RMFs improved the ignition performance of SCB.In the process of plasma rapid condensation with heat release,the product of RMFs enhanced the heat transfer process between the gas phase and the solid charge particle,which accelerated the expansion of hot plasma,and heated the solid charge particle as well as gas phase region with low temperature.In addition,it made up for pressure loss in the gas phase.During the plasma dissipation process,the exothermal chemical reaction in RMFs acted as the main heating source to heat the charge particle,making the surface temperature of the charge particle,gas pressure,and gas temperature rise continuously.This result may yield significant advantages in providing a universal ignition model for miniaturized ignition devices.
基金Sponsored by the Anhui Province Colleges Young Talents Fund(2011SQRL121)
文摘The plasma temperature of the semiconductor bridge (SCB) was measured in real-time according to relative intensity ratio of dual lines of atomic emission spectrum.The plasma temperature under different discharge pulses and the influence of discharge pulse energy on it were studied.The results show that the plasma peak temperature rises gradually with the increase of initial discharging voltage and charging capacitance.For the capacitance of 22 μF,if the initial discharging voltage increases from 21 V to 63 V,the plasma peak temperature rises from 2 000 K to 6 200 K.For the discharging voltage of 39 V,the peak temperature rises from 2 200 K to 3 800 K when the capacitance increases from 6.8 μF to 100 μF.The change of pulse discharge has a very small effect on the plasma temperature at the late time discharge (LTD).In view of the change of plasma temperature with the pulse energy,the discharging voltage has a greater effect on the plasma temperature than the capacitance.The results provide some experimental basis for the further research on SCB ignition and detonation mechanisms.
基金supported by the National Natural Science Foundation of China(Grant Nos.22275092 and 52372084)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX24_0709)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.30923010920)the State Key Laboratory of Transient Chemical Effects and Control,China,(Grant No.6142602230201).
文摘Enhancing the output capacity of semiconductor bridge(SCB)through the application of composite nano-energetic films is a subject of wide concern.Furthermore,improving the safety,reliability,and production efficiency of energetic semiconductor bridge(ESCB)is the primary focus for large-scale engineering applications in the future.Here,the Al/CuO nano-film ESCB was efficiently fabricated using 3D direct writing.The electrostatic safety of the film is enhanced by precisely adjusting the particle size of Al,while ensuring that the SCB can initiate the film with small energy.The burst characteristics of SCB/ESCB were thoroughly investigated by employing a 100 mF tantalum capacitor to induce SCB and ESCB under an intense voltage gradient.The solid-state heating process of both SCB and ESCB was analyzed with multi physical simulation(MPS).The experimental results demonstrate that the critical burst time of both SCB and ESCB decreases with increasing voltage.Under the same voltage,the critical burst time of ESCB is longer than that of SCB,primarily due to differences in the melting to vaporization stage.The MPS results indicate that the highest temperature is observed at the V-shaped corner of SCB.Due to the thermal contact resistance between SCB and the film,heat conduction becomes more concentrated in the central region of the bridge,resulting in a faster solid-state heating process for ESCB compared to SCB.The results of the gap ignition experiments indicate that at a 19 mm gap,an ESCB with a film mass of 10 mg can ignite nickel hydrazine nitrate(NHN)and cyclotrimethylenetrinitramine(RDX).This suggests that thermite ESCB can serve as a novel,safe,and reliable energy exchange element and initiator in largescale engineering applications.
