Table of Content

30 June 1992, Volume 13 Issue 2

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Paper

Droplet Dispersion in Liquid Propellant Guns

Yuan Yaxiong

1992, 13(2):  1-5.  doi:10.3969/j.issn.1000-1093.1992.02.001

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The interaction between the dispersed droplets and the turbulent fluid has long been an important subject of study in the mechanism of multiphase flow and combustion in the interior ballistic theory of liquid propellant guns. The particle trajectory model and the Monte-Carlo method are employed in this study for modeling the chamber fluid field. The prediction of the droplet dispersion in isotropic turbulence is in reasonable good agreement with the experimental results. The results of the droplet dispersion in unisotropic homo?geneous turbulence are also reported.

A New Method fbr Predicting Ballistic Performance Based on the Thoery of Potential Equilibrium in Interior Ballistic and Making Ues of Closed Bomb Tests

Bao Tingyu,Qiu Wenjian,Zhuang Guozhen,Zhang Zhaojun,Yang Xinmin,Xu Wenjuan

1992, 13(2):  6-11.  doi:10.3969/j.issn.1000-1093.1992.02.002

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Based on the theory of potential equilibrium in interior ballistics, this paper presents a new method for the prediction of propellant peak pressure in a gun barrel and of the muzzle velocity，applying closed bomb tests. In contrast with the existing RQ and RF method, the new method does not require any pre- firing data to arrive at the empirical coefficients in the formulas and has a high accuracy. The new approach is thus seen to be of practical use and widely applicable.

Porous Medium Models for the Early Stages in the Interior Ballistic Cylce

Song Ming

1992, 13(2):  12-18.  doi:10.3969/j.issn.1000-1093.1992.02.003

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The process of the two-phase flow in guns may be devided into two stages，that is, the static bed stage and the fluidized bed stage. According to the characteristics of the static bed stage，this paper aims to establish a porous medium mechanic-dynamic model for the ignition gas flow compressing the charge bed and a porous medium thermo- dynamic model for the ignition gas flow igniting the charge bed. Results of calculation following these are in agreement with the experimental findings to a certain extent.

An Experimental Study of the Interphase Convective Heat Transfer Coefficient in Charge Packed Beds

Zhou Yanhuang, Zhang Mingan, Wang Shengchen, Liu Baomin,Tao Wenquan, Xin Rongchang

1992, 13(2):  19-23.  doi:10.3969/j.issn.1000-1093.1992.02.004

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The average convective heat transfer coefficient in charge beds having a diameter of 100mm and heights of 70, 100mm with porosity of 0. 450 ?0. 457 is experi?mentally obtained by means of the Naphthalene Sublimation Mass/Heat Analogy Technique which is reported in this paper. The grains are cylindrical, having diameters of 7，10 and 13mm and length-diameter ratio l/d varying around 1. 9 ?2. 0 , Within the limit of Re,= 3. 5 X 103 ?8.82X 104 based on the equivalent diameter dp, the Nesselt Number under this condition is obtained as Eqn. (4. 7).

Lethality Calculation for Preformed Fragment Warheads

Xu Wencan, Zhang Lianyu

1992, 13(2):  24-30.  doi:10.3969/j.issn.1000-1093.1992.02.005

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A method for calculating the killing zone of preformed fragment warheads applicable even in cases where the warhead velocity is larger than the average velocity of preformed fragments is given. An algorithm for the isoprobability function of killing is also given，and ways of approaching the drag coefficient of fragments are discussed.

Overhead-Attack Guidance

Zhang Yun,Tang tao,Du bin

1992, 13(2):  31-37.  doi:10.3969/j.issn.1000-1093.1992.02.006

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A method of quasi-three-point guidance and laws of overhead-attack guidance for remotely controlled anti- tank missiles are presented. Method of quasi- proportional navigation and laws of dive overhead-attack guidance for target homing anti-tank missiles are also presented. A parameter optimized controller for implementing this kind of overhead- attack guidance and a similar controller for implementing the dive overhead-attack guidance are proposed.

Calculation of Vibration Mode and Its Experimental Study in Solid Rocket Motors

Zou Junwei,Sun Weishen,Xing Chunjing

1992, 13(2):  38-45.  doi:10.3969/j.issn.1000-1093.1992.02.007

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In this paper，a method for the calculation of vibration mode in rocket motors is presented, and a corresponding program is worked out. Values calculated with this program are consistent with theoretical or experimental results, the results, indicating that the program is soundly based. A new type of vibration excitation apparatus-turbo vibration exciter is also introduced in this paper, used for the determination of natural frequency of acoustic cavities, and of acoustic damping coefficients of motor.

Synthesis of 6,6ˊ-Dinitro Tetrafuroxano(b,d,bˊ,dˊ) Bipheny1

Chen Boren,Liao Zhiyuan

1992, 13(2):  46-48.  doi:10.3969/j.issn.1000-1093.1992.02.008

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A hydrogen-free compound 6,6ˊ-dinitro tetrafuroxano (b,d,bˊ,dˊ) biphenyl (3) was synthesized through the introduction of furoxano groups on the aromatic ring and some of its properties are reported. 3, 5, 3ˊ, 5ˊ-tetraazido- 2, 4, 6, 2ˊ, 4ˊ, 6ˊ-hexanitro biphenyl (2) was prepared through nitrating 3，5，3ˊ,5ˊ-tetraazido- 2, 4, 6, 2ˊ，4ˊ- pentanitrobiphenyl, and then pyrolyzed to the title compound (3).

Synthesis of Potassium 3,3ˊ-Diamino-2,2ˊ,4,4ˊ,6,6ˊ-Hexanitro Diphenylamide and its Applications

Lu Chunxu,Lu Zaosheng

1992, 13(2):  49-54.  doi:10.3969/j.issn.1000-1093.1992.02.009

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Potassium 3, 3ˊ-diamino-2,2'，4，4'，6，6ˊ-hexar^tro diphenylamide is a new kind of heat-resistant explosive, not yet seen reported in the literature. In this paper, the optimum technological conditions for the synthesis of this explosive are studied in detail and structure of the intermediates and of the final product identified. The condensation reaction is dissussed in particular. Chief properties of the explosive have been tested. It possesses fine characteristics on ignition and combustion ； its use as a complex ignition agent has brought about satisfactory results. It has been shown that in practical applications as heat-resistant detonation materials, it will prove to be a new kind of heat-resistant ignition agent.

Optimal Parameter Analysis of the Time of Flight and Speed Dotectibn

Zhang Tong, Xiong Guilan

1992, 13(2):  55-60.  doi:10.3969/j.issn.1000-1093.1992.02.010

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In this article are analysed the optimal parameters on the detection of the time of flight and the speed of a projectile and the parameters of detection circuit noise, frequency band, amplification factor, amptitude discriminator threshold value, which are thus provided with the reliable base of design. The results of expriments are finally given.

Natural Coordinates Method for the Dynamic Analysis of Multibody Systems

Shui Xiaoping,Liu Boxun

1992, 13(2):  61-68.  doi:10.3969/j.issn.1000-1093.1992.02.011

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In this paper, the natural coordinates are used to simulate and to solve the dynamic problem of multibody systems. To do this, the generalized mass matrixes and generalized external forces of some typical rigid bodies are derived. The dynamic equations of multibody systems are formulated. Finally, one example is presented.

Utilization of Heat Released in the Process of Metallic Corrosion

Liu Rongjing,He Dongbao, Li Lihua, Bo Faqing,Wang yuezhen

1992, 13(2):  69-74.  doi:10.3969/j.issn.1000-1093.1992.02.012

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In this paper utilization of heat released in the process of metallic corrosion is discussed. Heat- release during the process of metallic corrosion is expounded from its theoretical and practical sides and collection and utilization of the heat produced in this process is examined in detail. By way of accumulation of particles，a comprehensive study has been undertaken on the tendency toward corrosion of a variety of metals, conditions of heat-release and its collection during the process of corrosion, and the speed of corrosion affecting heat release. Heat retrieval during a process of corrosion of ferrous metals is entirely free from the generation of any smoke or flame or poisonous pollutions. Pulverized iron such as filings are abundant for use as raw materials and cheap everywhere. Further development is worthy of consideration.

Research Notes

Wounding Effect and Lethality Criterion of Spherical Fragments to Living Targets

Wang Changren

1992, 13(2):  75-78.  doi:10.3969/j.issn.1000-1093.1992.02.013

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This paper gives a brief account of the wounding effects of spherical fragments. The damages are correlated with the term mvβ A proper selection of ^ has been proposed.

A Mew Method for the Preparation of DATB, TATB and Their Intermediates

Wei Yunyang

1992, 13(2):  79-81.  doi:10.3969/j.issn.1000-1093.1992.02.014

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Treating m-nitrobenzoic acid (la) and 3, 5-dinitrobenzoic acid (lb) with sodium azide in super-acid medium gave m-nitroaniline (2a) and 3,5-dinitroaniline (2b), respectively, 1,3-diamino-2,4, 6-trinitrobenzene (DATB) and 1, 3, 5-triamino-2,4,6- trinitrobenzene (TATB) were then obtained via further reactions of the intermediates9 2a and 2b. This represents a new route for the preparation of heat-resistant explosives，DATB and TATB.

Chemical Kinetic Study for the Reaction of Bouding Agents T313(B) and T313(B+C) with Water

Ren Minrong,Wu Wei,Zhang Zhiyong

1992, 13(2):  82-85.  doi:10.3969/j.issn.1000-1093.1992.02.015

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Reaction enthalpy，order and activation energy of T313 (B) and T313 (B +C) with water were measured. Thermal analyses of T313 (B) and T313 (B+C) were made by DTA. The reaction mechanisms of T313 (B) and T313 (B+C) with water are discussed in this paper.

Generalized Mac-Millanˊs Equations in Terms of Quasi-Coordinates for Variable-Mass Systems with High-Order Non-Holonomic Constraints

Chen Liqun,Wang Tieguang

1992, 13(2):  86-91.  doi:10.3969/j.issn.1000-1093.1992.02.016

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In this paper，generalized Mac-Millan，s equations in terms of quasi-coordinates for variable-mass systems with high- order non- holonomic constraints are obtained. Corresponding Nielsen’s forms of the equations are given. The equivalence between the equations and generalized Chaplyginas equations for variable-mass systems with high-order non-holonomic constraints is demonstrated. Two special cases are discussed.

A Method for the Evaluation of Failure Probablity in Redundant Structures

An Weiguang,Cai Yinlin

1992, 13(2):  92-96.  doi:10.3969/j.issn.1000-1093.1992.02.017

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There exist many failure models in a redunant structure, it is rather complicated to calculate precisely the failure probability in a structure. In this paper, a simple method is proposed to evaluate the failure probability in structures. Based on the bounding criterion and the formulation of the maximum contribution of the excluded failure modes to the structure failure probability, the lower and upper bounds of failure probability are estimated by branching and bounding operations selecting only the dominant failure modes to complete the calculation of failure probability in a structure. A numerical example is provided to demonstrate the validity of the proposed method.