Studies of Overdriven Detonation Wave Transition in a Gradual Area Expansion for PDE Applications

2004 ◽  
Author(s):  
Christopher Conrad ◽  
Silvano Saretto ◽  
Seong-Young Lee ◽  
Robert Santoro
Keyword(s):  
Detonation Wave ◽  
Overdriven Detonation ◽  
Area Expansion

Investigation on the Time Error of Detonation Acoustic in Process of Formation and Propagation

2019 ◽  
Vol 36 (4) ◽  
pp. 391-399
Author(s):  
Gui-yang Xu ◽  
Chun-guang Wang ◽  
Shao-qing Hu ◽  
Jian-Liang Gong ◽  
Zhe Deng
Keyword(s):  
Detonation Wave ◽  
Arrival Time ◽  
Time Error ◽  
Two Phase ◽  
Filling Fraction ◽  
Convergent Nozzle ◽  
Interval Time ◽  
Pulsed Detonation Engine ◽  
Detonation Engine ◽  
Overdriven Detonation

Abstract The time error of detonation acoustic in process of detonation formation and propagation in a multi-cycle gas-liquid two-phase pulsed detonation engine is experimentally investigated. Results from the tests show that before the detonation wave escapes through the open-end of PDE tube, the maximum average arrival time error of detonation acoustic is achieved in the process of overdriven detonation. After detonation wave exists of PDE tube, arrival time error at 0 deg is greater than the other directivity angles in all distances and increases dramatically first and then almost stays at a certain value. The filling fraction has a major impact on the time error of detonation acoustic. With filling fraction increasing, there are increases in arrival time error and interval time error. Arrival time error with the highest filling fraction at 30 deg is much greater than other filling fraction. The convergent nozzle exhibits a marked suppression in the time error of detonation acoustic, where the maximum reductions of 62.02 percent and 56.13 percent are obtained in arrival time error and interval time error respectively.

scholarly journals The EFP Formation and Penetration Capability of Double-Layer Shaped Charge with Wave Shaper

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4519
Author(s):  
Yakun Liu ◽  
Jianping Yin ◽  
Zhijun Wang ◽  
Xuepeng Zhang ◽  
Guangjian Bi
Keyword(s):  
Detonation Wave ◽  
Double Layer ◽  
Detonation Velocity ◽  
Incidence Angle ◽  
Shaped Charge ◽  
Experimental Simulation ◽  
Detonation Waves ◽  
Forming Process ◽  
Large Length ◽  
Overdriven Detonation

Detonation waves will bypass a wave shaper and propagate in the form of a horn wave in shaped charge. Horn waves can reduce the incidence angle of a detonation wave on a liner surface and collide with each other at the charge axis to form overdriven detonation. Detection electronic components of small-caliber terminal sensitive projectile that are limited by space are often placed inside a wave shaper, which will cause the wave shaper to no longer be uniform and dense, and weaken the ability to adjust detonation waves. In this article, we design a double-layer shaped charge (DLSC) with a high-detonation-velocity explosive in the outer layer and low-detonation-velocity explosive in the inner layer. Numerical and experimental simulation are combined to compare and analyze the forming process and penetration performance of explosively formed projectile (EFP) in DLSC and ordinary shaped charge (OSC). The results show that, compared with OSC, DLSC can also adjust and optimize the shape of the detonation wave when the wave shaper performance is poor. DLSC can obtain long rod EFPs with a large length-diameter ratio, which greatly improves the penetration performance of EFP.

On the early relaxation of an overdriven detonation wave

1965 ◽  
Vol 9 (4) ◽  
pp. 423-425 ◽  
Author(s):  
R.A. Strehlow ◽  
W.E. Hartung
Keyword(s):  
Detonation Wave ◽  
Overdriven Detonation

Cellular Pattern Evolution of Deflagration-to-Detonation Transition in Square Detonation Tube

2011 ◽  
Vol 130-134 ◽  
pp. 3351-3355
Author(s):  
Peng Gang Zhang ◽  
Xiao Min He ◽  
Qian Wang
Keyword(s):  
Experimental Investigation ◽  
Detonation Wave ◽  
Early Stage ◽  
Pressure Transducers ◽  
Entire Process ◽  
Detonation Tube ◽  
Deflagration To Detonation Transition ◽  
Cellular Pattern ◽  
Detonation Transition ◽  
Overdriven Detonation

This paper presents recent results of an experimental investigation on Deflagration to Detonation Transition (DDT) with H2/air and C2H2/air mixtures in 60mm×60mm square detonation tube. The entire process of DDT is demonstrated by cellular patterns and the analysis is mainly based on their evolution.The pressure transducers and ion-probes were utilized to get the pressure and flame history in the tube respectively, and the corresponding cellular patterns are recorded on soot foils along cover board with 60mm×1380mm.Results show that overdriven detonation appears only once and several blast appear in DDT.Cellular patterns show that severaltwistable linesappear at the obstacle exit neighborhood area , while regular cell takes place after the final twistable line.Details of the cellular pattern indicate that from the early stage to the end of regular cell, the detonation wave sequentially experiences impactive area, abundant secondary cells, secondary cells expanding, local explosive, fine secondary cells, regular cell.

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