检索结果-内蒙古大学图书馆

2018国际防务技术大会（ICDT）

作者： Qing MU Tian-hong XIONG Kang-jian WANG Wen-jun YI Jun GUAN National Key Laboratory of Transient Physics Nanjing University of Science and Technology

To explore the impact of water entry angle on the cavitation flow field of high-speed projectile,numerical simulation for modeling the water entry problem of projectile at high speed is performed,based on the finite volume method,VOF multiphase model,Schnerr-Sauer cavity model,SST k-ωturbulence model and dynamic mesh *** results show that,the larger the entry angle is,the greater the peak pressure of the projectile is,and the faster rate of pressure decline when it enters the ***,the greater the water entry velocity of the projectile,the greater the pressure at the moment of impacting the water,the greater the acceleration and the attenuation rate of the *** projectile is subjected to higher impact load at the moment of impacting the water,and the peak pressure is as many as thousands of times of atmospheric pressure.

关键词： Supercavitation Numerical simulation Multiphase flow Unsteady

来源：评论

学校读者我要写书评

暂无评论

Nonlinear dynamics and bifurcation control of underwater supercavitating vehicles

Nonlinear dynamics and bifurcation control of underwater sup...

引用

2018国际防务技术大会（ICDT）

作者： Yi-pin LV Tian-hong XIONG Wen-jun YI Kang-jian WANG National Key Laboratory of Transient Physics Nanjing University of Science and Technology

Numerical investigations and analytical into the dynamics and control of supercavitating vehicles are presented.A four-dimensional dynamic model for supercavitating vehicles is *** nonlinearities of this system is due to the planing force acting on the *** ranges of control law and cavitation number for the stable motion are determined by distribution diagram of stable equilibrium *** bifurcation analysis with variable control laws is *** indicates that the motion of supercavitating vehicles is found to have complex nonlinear physical phenomena,such as Hopf bifurcation,periodic window and *** the use of bifurcation control to suppress or delay the onsets of Hopf bifurcation is *** robustness and stability of underwater supercavitating vehicles can be improved by adjusting the control law reasonably.

关键词： Supercavitating vehicles Nonlinear dynamics Bifurcation control Control law

来源：评论

学校读者我要写书评

暂无评论

Experimental investigation on the propagation mode of two-phase rotating detonation wave

Experimental investigation on the propagation mode of two-ph...

引用

2018国际防务技术大会（ICDT）

作者： Yu-wen WU Chun-sheng WENG Quan ZHENG Wan-li WEI Yu-jie QIU Hao-long MENG Chen-wei DING National Key Laboratory of Transient Physics Nanjing University of Science and Technology

Being a new novel detonation-based engine,the rotating detonation engine（RDE） has now received extensive attention *** order to achieve the practical application,liquid hydrocarbon fuel is more ***,the propagation control of two-phase rotation detonation wave is *** unstable propagation mode will deteriorate the engine *** paper presents the experimental research on the propagation characteristics of two-phase rotating detonation wave on a liquid-fueled rotating detonation *** and oxygen-enriched air are used as fuel and *** pressure transducers and ion probes are used to monitor the detonation propagation *** results indicate that the single-wave propagation mode of two-phase rotating detonation wave is obtained and the propagation frequency is about 2400 *** rising edge of the pressure curve and the falling edge of the voltage curve are synchronous and dominant frequencies of two curves are in agreement with each *** with the pressure transducer,the ion probe can fairly register the detonation propagation characteristics in long-range RDE test.

关键词： Rotating detonation engine Liquid fuel Propagation mode Ion probe measurement Long-range test

来源：评论

学校读者我要写书评

暂无评论

Effect of flame stabilization structure on flow field of Al/AP powder engine

Effect of flame stabilization structure on flow field of Al/...

引用

2018国际防务技术大会（ICDT）

作者： Wang LI Qiao-dong BAI National Key Laboratory of Transient Physics Nanjing University of Science and Technology

To investigate the effect of flame stabilization structure on the flow characteristics of Al/AP powder engine combustion *** dimensional numerical simulation of the flow field in the combustion chamber of an Al/AP powder engine with a diaphragm plate or a flame holder was conducted to compare with common structure and investigate the differences in the fluidization condition and influence of diaphragm plate and flame holder on combustion chamber flow and combustion efficiency of *** results show that the flame stabilized structure can improve the fluidization of the powder,and make the flame more "full" and the combustion efficiency of particles increase to 1.6～2 times.

关键词： Al/AP powder engine Flame stability Reversed flow Particle combustion efficiency

来源：评论

学校读者我要写书评

暂无评论

Method of ballistic control and projectile rotation in a novel railgun

Method of ballistic control and projectile rotation in a nov...

引用

2018国际防务技术大会（ICDT）

作者： Bo TANG Ying-tao XU Gang WAN Jiang YUE Yong JIN Hai-yuan LI National Key Laboratory of Transient Physics Nanjing University of Science and Technology

In order to realize the ballistic control of the railgun and the flight stability of the projectile.A new type of railgun is designed,which can control the muzzle velocity and rotation *** method of the muzzle velocity and overload control is to adjust the voltage or other parameters of pulse power *** would be easy to change velocity accurately in large *** widespread concern problem is launching the spinning stability projectile by *** paper designed a new structure of additional rails to generate an unsymmetrical magnetic field to produce rotational torque in *** structure is simple and can control the rotation rate by linear changing the barrel *** calculation formulas of interior ballistic are derived by Biot-Safar *** important parameter is the deflection angle of the additional rails relative to the symmetry plane of main *** larger the angle,the greater the rotation torque generated in the *** maintain the flight stability of the projectile,the barrel structural parameters should be proportional to the projectile structural *** changing the muzzle velocity,the rotation rate will also be the equal proportion *** that the gyro stability is the *** experiment proves that the railgun designed in this paper can launch the projectile to *** the rotational projectile may not cause the transition or much *** method expands the application of the railgun.

关键词： Ballistic control Railgun Rotation Spin-stabilized projectile

来源：评论

学校读者我要写书评

暂无评论

Two-stage irregular projectile penetration resistance analysis

Two-stage irregular projectile penetration resistance analys...

引用

2018国际防务技术大会（ICDT）

作者： Zhi-cheng FENG Ya-yun ZHAO Lin LI Tian-xiong LI Yu-xi XIE Yu-xin SUN National Key Laboratory of Transient Physics Nanjing University of Science and Technology

In order to improve the penetrating ability of theearth penetration weapons（EPW）,based on dynamic cavity expansion,the derivation of penetration resistance formula for the projectile with two-stage irregular nose is conducted with the variable of projectilenose shape ***,the variation of the factor of the projectileswith different nose shapesandtheogive-nose projectile with equal warhead lengthwith the ratio of diameters ζ of the two-stage warhead is ***,it is assumed that the pre-penetratedcavity can weakens the penetration resistance,and it is verified by numerical simulation that ζ≈ 0.6 is the optimal *** the case where the traditional method cannot explain the experimental results,a consistent conclusion is obtained through reasonable hypothesis,which can provide reference for the theoretical analysis of penetration resistance and the optimization design of the irregular projectile.

关键词： Dynamic cavity expansion Irregular head Nose shape Pre-penetration

来源：评论

学校读者我要写书评

暂无评论

Influence of Taylor waves on standing windows of oblique detonation wave

引用

Journal of physics: Conference Series 2020年第10期1507卷

作者： H Cui M Y Gui L Y Zhang H Zhang Science and Technology on Transient Physics Laboratory Nanjing University of Science and Technology Nanjing 210094 China Department of Mathematics Imperial College London London SW7 2AZ UK

An oblique detonation wave stabilized over a body has been studied due to the ongoing development of high-speed propulsion systems, such as oblique detonation wave engines and ram accelerators. Standing window of oblique detonation wave reflects the degree of standing difficulty. Firstly, Shock relations coupled with chemical equilibrium are solved to draw detonation polar diagrams between oblique detonation angle and wedge angle by iterative algorithm. In these diagrams, the wedge angle detaching from the wedge nose is referred as the maximum wedge angle θιηॉκ and forming CJ detonation in the direction normal to the oblique detonation wave is referred as the minimum wedge angle θख़τ. The region between the two wedge angles is regarded as the standing windows. G. Emanuel holds that Taylor waves follow the oblique detonation wave as the wedge angle is smaller than θख़τ. Based on reactive Euler equation, wedge-induced oblique detonation is simulated in this paper. For the case of the wedge angle below θख़τ, Taylor waves change post-detonation wave flow field to maintain standing oblique detonation wave. Therefore, the standing window becomes wider.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of high-speed projectile water entry

Numerical simulation of high-speed projectile water entry

引用

2018国际防务技术大会（ICDT）

作者： Yu-xi XIE Jiang-tuo FENG Tian-xiong LI Yu-xin SUN National Key Laboratory of Transient Physics Nanjing University of Science and Technology

In order to study the process of water entry of high speed projectile and the law of development of vacuoles,a new type of projectile was *** the vertical water entry of the projectile with nine different nose sizes are numerically simulated using *** the study of different head size high speed water into the process of cavitation law,speed attenuation,deceleration changes and head shape drag coefficient changes over *** research shows that the design of head stepped cavitation can significantly reduce the water entry resistance.

关键词： New projectile Water entry Hydro-ballistic stability Velocity attenuation

来源：评论

学校读者我要写书评

暂无评论

Research on the dynamic response of composite barrel in railgun shot tests

Research on the dynamic response of composite barrel in rail...

引用

2018国际防务技术大会（ICDT）

作者： Hong-cheng XIAO Yuan GAO Bao-ming LI National Key Laboratory of Transient Physics Nanjing University of Science and Technology

The dynamic response of fiber reinforced railgun barrel in railgun shot tests has been simulated by a code introduced in this *** code is developed based on a load transfer coupled physics *** and structure physics files are created independently and fully coupled in every time step for a coupled *** distributions of magnetic field,eddy current and magnetic force in rails and composites in a railgun shot are simulated.A subsequent stress analysis at the same time point is conducted by mapping nodal results from electromagnetic analysis to structure *** effect of pulse current is included in the computational *** efficiency of this code is improved by adjusting the length of solving time for starting and acceleration of armature in railgun *** results by this code show good agreement with experimental results in railgun shot tests.

关键词： Dynamic response Fiber reinforcedbarrel Coupled physics analysis Magnetic force

来源：评论

学校读者我要写书评

暂无评论

The calibration of the B-dot probes for magnetic induction intensity measurement in electromagnetic emission experiments

The calibration of the B-dot probes for magnetic induction i...

引用

2018国际防务技术大会（ICDT）

作者： Chun-yan ZHU Long LI Bao-ming LI National Key Laboratory of Transient Physics Nanjing University of Science and Technology

In electromagnetic emission,B-dot probes can measure the spatial magnetic field,as well as the armature *** this paper,self-developed B-dot probes are calibrated based on the B-dot probe magnetic induction *** working principle of the calibration system is described in detail,andthe calibration data of the B-dot probes are *** only does the experiment verify thatthe magnetic field intensity is proportional to the time integral of inductive voltage of the B-probe,but also the sensitivity coefficient of each probe can be calculated through *** then,a set of magnetic-field component along rail was calculated through analyzing experimental data sets acquired by armature probes in the electromagnetic rail gun experiment.

关键词： B-dot probe Calibration Electromagnetic launch Electromagnetic induction intensity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：