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| 1 | 超多孔圆片(MPD)发射药定容燃烧特性的数值计算显示文摘为模拟并优化超多孔圆片发射药的燃烧性能,建立了一种超多孔圆片发射药的定容燃烧模型。在几何燃烧定律条件下,计算了超多孔圆片发射药的燃烧压力曲线和动态活度曲线与超多孔圆片的关系;分析了超多孔圆片厚度、内孔孔径、燃速系数及燃烧压强指数对其燃烧性能的影响。结果表明,超多孔圆片发射药的药型结构与配方共同影响其燃烧性能;超多孔发射药圆片厚度的增加及内孔孔径的降低可提高超多孔圆片发射药最大动态活度以及燃烧时间;但超多孔圆片发射药药型尺寸对其燃烧性能的影响较弱;相对而言,发射药配方燃速系数及压强指数对其燃烧影响较大,燃速系数及压力指数较大的超多孔圆片发射药的燃烧特性更优。 | 杨伟涛 Clive Woodley 闫光虎 胡睿 肖霞 | 2021 | 火炸药学报2021，44，4： | 2 |
| 2 | Ignition and combustion of pyrotechnics at low pressures and at temperature extremes显示文摘Rapid and effective ignition of pyrotechnic countermeasure decoy flares is vitally important to the safety of expensive military platforms such as aircraft. Qineti Q is conducting experimental and theoretical research into pyrotechnic countermeasure decoy flares. A key part of this work is the development and application of improved models to increase the understanding of the ignition processes occurring for these flares. These models have been implemented in a two-dimensional computational model and details are described in this paper. Previous work has conducted experiments and validated the computational model at ambient temperature and pressure. More recently the computational model has been validated at pressures down to that equivalent to 40,000 feet but at ambient temperature(~290 K).This paper describes further experimental work in which the ignition delays of the priming material in inert countermeasure decoy flares were determined for pressures down to 40,000 feet and at temperature extremes of -40℃ and 100℃ Also included in this paper is a comparison of the measured and predicted ignition delays at low pressures and temperature extremes. The agreement between the predicted and measured ignition delays is acceptable. | Clive Woodley R.Claridge N.Johnson A.Jones | 2017 | Defence Technology(防务技术)2017，13，3： | 1 |
| 3 | The ballistic performance of the bombard Mons Meg显示文摘The bombard Mons Meg, located in Edinburgh Castle, with a diameter of 19 inches(48 cm), was one of the largest calibre cannons ever built.Constructed in 1449 and presented to King James II of Scotland in 1454, Mons Meg was used in both military and ceremonial roles in Scotland until its barrel burst in 1680. This paper examines the history, internal, external and terminal ballistics of the cannon and its shot. The likely muzzle velocity was estimated by varying the propellant type and the cannon profile was investigated to identify weak spots in the design that may have led to its failure. Using the muzzle velocity calculated from the internal ballistics, simulations were performed with granite and sandstone shot for varying launch angle and ground temperature. The likely trajectory and range of the cannonballs are described. The internal and external ballistics informed the initial conditions of the terminal ballistic impact scenarios. The performance of the cannonball against both period and modern targets, in the form of a pseudo-castle wall and a monolithic concrete target, respectively, were simulated and are presented and discussed. | Ian LEWTAS Rachael MCALISTER Adam WALLIS Clive WOODLEY Ian CULLIS | 2016 | Defence Technology(防务技术)2016，12，2： | 0 |
| 4 | Effects of Nano-Aluminium on The Combustion of A PolyNIMMO-Based Propellant显示文摘Propellants containing micro-aluminium particles have been shown to produce faster burn rates than conventional gun propellants.However,they are also more abrasive than conventional propellants.Nano-material propellants have been reported to give similar benefits to micron-material propellants but without the disadvantage of increased abrasion.Tests were conducted to compare the burn rates,ignitability and wear rates of a propellant loaded with 0% aluminium,15% micro-aluminium and 15%nano-aluminium.Closed vessel tests showed a burn rate increase of 39% in the range 30-250 MPa,and 70% at low pressure(50-100MPa)for the nano-aluminium propellant compared with the baseline propellant.The micro-aluminium propellant showed only a 10%increase in the burn rate compared with the standard propellant.The ignition delay for the nano-aluminium propellant was slightly shorter than that of the baseline propellant.Substantially increased wear rates were measured for the micro-aluminium propellant.The nano-aluminium propellant showed reduced wear rates compared with the micro-aluminium propellant but these were still substantially greater than those for the baseline propellant. | Clive Woodley Peter Henning | 2014 | 火炸药学报2014，37，6： | 0 |
| 5 | Use of A Shatter Test Vessel to Assess Propellant Safety显示文摘At low temperatures,gun propellant grains may become brittle and this can lead to fracture or shatter of the grains during gun firing.Should this event occur then it will result in an increase in the burning surface of the propellant and will give rise to a change in ballistic performance.Also,if the resultant over pressure is sufficient,a breech failure may result.Understanding the propensity of a grain to fracture or shatter is therefore important in determining its safety in use.This document describes a test that may be used to derive knowledge and to quantify the physical behaviour of a gun propellant grain at the low temperatures at which fracture or shatter is most likely to occur. | Clive WOODLEY Peter HENNING | 2015 | 火炸药学报2015，38，5： | 0 |
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