火箭研究

Lastly, two-phase flow flied is studied under spinning (60n/s and 100n/s) condition, integral calculation of the two-phase flow is completed in the spinning SRM combustion chamber and nozzle, and the behavior and varieties of parameters of different diametric particles are studied in spinning internal flow flied thoroughly. The analysis of result and discussion are presented by comparison to two-phase flow flied of no-spinning case.

最后重点研究旋转情况下(25n/s和60n/s)固体火箭发动机两相流场，进行旋转固体火箭发动机燃烧室—喷管一体化两相流场数值模拟，分析了发动机内不同颗粒的运动及参数变化规律，并与不旋转两相流场对比进行结果分析和讨论。

From the viewpoint of large system dynamics including rockets, gun, propellant and launch environment, the whole process of LRMLRS from the ignition to level point is deeply studied by three ways, that is theory, computation and experiment, in this paper.

远程多管火箭动力学是研究远程多管火箭在发射与飞行过程中的受力及运动规律和控制过程，进而研究控制其受力与运动的理论、技术和试验测试方法。

An international advanced target tacking algorithm, which is an analytical trackingprocess based on the affine transformation model by simulating biological vision machinery, isalso introduced. And the mathematical denotation for the infinitesimal generator of affine Liegroup is deduced in this paper.

论文的主要工作包括： 1、介绍了靶场测量中火箭三维姿态的光学测量方法及其理论基础，着重对单相机测量滚转角的四区域轮廓螺旋线法进行了深入探讨和研究，对该算法进行了编程实现，利用仿真图和靶场某型火箭的数字图像对该算法进行了检测，对测量结果进行了精度分析。

He was the founding director of the Daniel and Florence Guggenheim Jet Propulsion Center at Caltech and a member of the university's so-called Suicide Squad of rocket experimenters who laid the groundwork for testing done by JPL.

1943年，钱学森和其他两名加州理工学院火箭研究小组的成员以喷气推进实验室之名起草出一份文件，建议军方开发导弹，以回应德国的V2火箭。

According to the air trajectory of every rocket-assisted torpedo part, we establish an equation group of air vertical motion, improve the in-air trajectory model, and simulatively calculate the polynomials of firing distance and flight time,and firing distance and shut down time. Making use of the polynomials, we calculate the cooperative time of formation salvo of torpedoes, and determine command ways for different situations. The result may facilitate the research of operational application of rocket-assisted torpedo.

根据火箭助飞鱼雷空中运动各部分的特点，建立了其空中纵向运动方程组，完善了空中弹道模型，仿真计算了射程-飞行时间和射程-关机时间关系多项式，利用关系式计算了编队齐射火箭助飞鱼雷的协同时间，确定了不同态势下的指挥方式，为深入研究火箭助飞鱼雷编队作战使用问题提供了重要的参考数据和理论依据。

The results showed that the performance of unchoked ducted rocket is superior to that of choked one. When the gas generator is loaded with high burning-rate exponent fuel-rich propellant, the performance of unchoked ducted rocket is almost the same as that of the ducted rocket working under fixed mass ratio of fuel to air.

研究结果表明：非壅塞固体火箭冲压发动机的性能显著优于燃气流量不可调的壅塞式固体火箭冲压发动机；当贫氧推进剂具有高的燃速压强指数时，非壅塞固体火箭冲压发动机的性能接近燃气流量完全调节、以等空燃比工作的冲压发动机性能。

The Budget Bureau would not even permit Kummersdorf to buy office equipment, and Von Braun learned early in the game the techniques of flimflamming the bureaucrats, e.g., it was a rare budget official who realized that Kummersdorf's request for funds to buy an "appliance for milling wooden dowels up to 10 millimeters in diameter" meant that the rocketmen needed a pencil sharpener.

预算局甚至不会允许库默斯斯多夫来买进办公设备，并且凡·布劳恩早早的就在这场游戏中学到荒唐的官僚主义的技巧，例如，预算官员很少发现库默斯斯多夫需要买进将木销到直径10毫米的机器的资金以为这火箭研究人员需要一个卷笔刀。

To improve the stability of Arcjet discharge plasma in low current and high voltage mode, research on the demand of output characteristics of Arcjet Power Conditioning Unit was conducted. In this paper, based on PWM invertors and current mode control, using MOSFET as the main power device, an Arcjet Power Conditioning Unit was developed. Through adding a closed loop feedback circuit of output voltage, it can make the output characteristics of PCU be positive resistance to ensure the stability of Arcjet discharge plasma. The experiment indicates that this PCU can make Arcjet engine work at high voltage mode (100 V, 10 A) and ensure the stability of arcjet discharge plasma. Finally, it provides the experimental data of Arcjet when working.

为了解决小电流、高电压下电弧火箭等离子体的稳定性问题，研究了电弧火箭发动机对电源调理单元的输出特性要求，基于逆变电源脉宽调制技术与峰值电流型控制原理，以MOSFET为主功率器件，研制了一台电弧火箭电源调理单元，给出了Arcjet工作时的实验数据，通过增加PCU输出电压的闭环反馈电路，可以使PCU的输出外特性呈现正阻性，保证电弧的稳定燃烧，实验结果表明，该电源调理单元能使电弧火箭发动机达到高电压工作模式(100V， 10A)，保持电弧工作的稳定性。

This dissertation focuses on the study of the propulsion method of missile/rocket by the gun. The two-stage propulsion technology and high-low launching technology are the two major methods. This dissertation mainly studies the two-stage propulsion technology.

本文研究的是炮射导弹／火箭技术，用火炮发射导弹／火箭的技术主要有高低压发射技术和二次发射技术等，本文侧重于研究新型的二次发射技术。

In 1943, Tsien and two others in the Caltech rocketry group drafted the first document to use the name Jet Propulsion Laboratory ; it was a proposal to the Army to develop missiles in response to Germany's V-2 rocket.

1943年，钱学森和其他两名加州理工学院火箭研究小组的成员以喷气推进实验室之名起草出一份文件，建议军方开发导弹，以回应德国的V2火箭。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了