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Ignition and combustion of pyrotechnics at low pressures and at temperature extremes

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Defence Technology（防务技术） 2017年第3期13卷 119-126页

作者： clive woodley R.Claridge N.Johnson A.Jones QinetiQ MOD Fort Halstead

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.

关键词：压力下降极端温度点火过程烟火二维计算模型燃烧实验工作点火延迟

The ballistic performance of the bombard Mons Meg

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Defence Technology（防务技术） 2016年第2期12卷 59-68页

作者： Ian LEWTAS Rachael MCALISTER Adam WALLIS clive woodley Ian CULLIS QinetiQ Fort Halstead

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.

关键词：弹道性能 Meg 内弹道计算 19英寸速度估计地面温度弹道冲击苏格兰

30th International Symposium on Ballistics,Long Beach,California,USA,11-15 September 2017

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Defence Technology 2017年第3期13卷 118-118页

作者： clive woodley International Ballistics Society

I am both delighted and excited that this is the third time Defence Technology has published scientific papers presented at an International Symposium on Ballistics(ISB).This particular issue publishes papers presente...

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29th International Symposium on Ballistics,Edinburgh,Scotland,UK,9-13 May 2016

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Defence Technology 2016年第2期12卷 58-58页

作者： clive woodley International Ballistics Society

We arc both delighted and excited that this is the second time Defence Technology has published scientific papers presented at an International Symposium on Ballistics(ISB).This particular issue publishes papers presented at the 29th ISB,co-chaired by Ian Cullis and clive woodley,QinetiQ,and supported by the National Defense Industrial Association(NDIA,www.ndia

关键词： ISB this International Symposium on Ballistics,Edinburgh,Scotland,UK,9-13 May 2016

1st International Conference on Defence Technology, Beijing, China,21-25 October 2018

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Defence Technology 2018年第5期14卷 353-353页

作者： clive woodley Changgen Feng Baoming Li Institute of Shock Physics Imperial College Beijing Institute of Technology China Academy of Ordnance Science

I am hugely delighted and excited to be writing this preface to the Defence Technology journal for the Special Issue containing papers to be presented at the 1;International Conference on Defence Technology（ICDT）.This is the first time Defence Technology has organised a conference and this one is intended to be the first of many ICDT,taking place at intervals of approximately 18 months.The 1;ICDT is co-chaired by Professor Changgen Feng and myself and supported by the China Ordnance Society.

关键词： Beijing China,21-25 October 2018 International Conference on Defence Technology

超多孔圆片(MPD)发射药定容燃烧特性的数值计算

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火炸药学报 2021年第4期44卷 538-542页

作者：杨伟涛 clive woodley 闫光虎胡睿肖霞西安近代化学研究所陕西西安710065 Imperial College London London UK

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... 详细信息

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。

关键词：物理化学超多孔圆片(MPD) 发射药燃烧性能计算密闭爆发器

On the Use of Accurate Ignition and Combustion Models in Internal Ballistics Gun Codes

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火炸药学报 2018年第2期41卷 117-121页

作者： clive Wooclley QinetiQ Fort Halstead Sevenoaks Kent TN14 7BP United Kingdom

The desire for increased performance from guns is driving the charge designer towards charges that present challenges to numerical modelling.There is a pressing need for accurate,validated ignition and combustion models that can be used to predict the performance of advanced charges and ensure pressure waves are not developed or,if they are,then they can be managed.This paper describes efforts to model complex charge designs using a two-dimensional axi-symmetric multi-phase flow internal ballistics model.

关键词： internal ballistics ignition combustion moclelling guns modular charges pressure waves

Effects of Nano-Aluminium on The Combustion of A PolyNIMMO-Based Propellant

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火炸药学报 2014年第6期37卷 7-11页

作者： clive woodley Peter Henning QinetiQ MOD Fort Halstead Sevenoaks Kent TN14 7BP United Kingdom

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.

关键词： physical chemistry closed vessel burn rate nano-aluminium wear and erosion poly(nitratomethyl methyl oxetane) base propellant

31st International Symposium on Ballistics,Hyderabad,India,4-8 November 2019

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Defence Technology（防务技术） 2019年第5期15卷 667-667页

作者： woodley, clive Li, Baoming Int Ballist Soc Long Beach CA 90802 USA

We are both delighted and excited that this is the fourth time Defence Technology has published scientific papers presented at an International Symposium on Ballistics(ISB).This particular issue publishes papers presented at the 31st ISB,co-chaired by Dr VK Saraswat,Member NITI Aayog,Government of India and Dr G.Satheesh Reddy,Secretary,Department of Defence(R&D)&Chairman DRDO,Government of India,and supported by the Aeronautical Society of India,Hyderabad Branch,and Cyberabad Convention Center Private Limited under the auspices of the International Ballistics Society(IBS,***).This is the first time the ISB has been held in India and only the second time in Asia.

关键词： excited presented India