火箭发动机

Boron is a kind of fuel obstinately searched for high-performance air-breathing solid rocket/ramjet engine and ramjet engine.

硼是高性能吸气式的固体火箭冲压发动机和冲压发动机瞩目追求的燃料，80年代常规固体火箭动力方面对硼燃料也表现了浓厚的兴趣。

Where supersonic speeds are encountered, such as in the propelling nozzle of the rocket, athodyd and some jet engines (Part 6), a convergent-divergent nozzle or venturi fig.

在遇到超音速的场合，如火箭的推进喷管，冲压式空气喷气发动机和某些喷气发动机(第6章)。

Once the rocket begins to decelerate at engine burnout, the inertial mass moves forward, relative to the rocket body, and closes the switch contacts.

一旦火箭开始减速，在发动机的工作倦怠，惯性质量向前迈进，相对火箭的机构，并关闭开关的接触。

Long march 5 carrier rocket second half of the year will turn from plan design phase this year for first appearance phase, this rocket will achieve the goal of avirulent, free from contamination, the engine of the rocket is to use liquid oxygen kerosene and oxyhydrogen to make fuel.

长征五号运载火箭今年下半年将从方案设计阶段转为初样阶段，这枚火箭将实现无毒、无污染的目标，火箭的发动机是用液氧煤油和氢氧作燃料。

The altitude characteristics and velocity characteristics of three types of solid ducted rocket, which are choked solid ramrocket with fixed mass flow rate of fuelrich gas generator, unchoked one and the one working under fixed mass ratio of air to fuel, were numerically studied.

通过数值计算，分析了燃气流量固定的壅塞式固体火箭冲压发动机、等空燃比工作的固体火箭冲压发动机和非壅塞固体火箭冲压发动机的高度特性和速度特性。

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。

Thrust tests show that two-chamber single-thrust rocket motor structure can effectively reduce the port parameter of the combuting motor,at the same time,make the motor combust stability.

推力试验表明：两室一推发动机结构能有效地减小燃烧时的通气参量，同时使得发动机燃烧稳定，可以用小火箭模拟大火箭的加速度曲线。

Finally, we prove that the system has good function though a large number of rocket projectiles test experiment.

最后，通过多批次火箭发动机试验，从实践方面证明了该测试系统的具有良好的性能。

By the late 1970s, the PRC had made breakthrough in a number of SLBM-associated technologies, including the lightweight nuclear warhead (600~700kg) developed by 14 Nuclear Institute; the guidance system developed by 717 Shipbuilding Institute; the onboard computer was developed by 771 Space Institute; the solid-propellant rocket motor by 4th Space Academy, the SLBM launch system developed by 701 Shipbuilding Institute, the inertial/celestial/satellite guidance system developed by 707 Shipbuilding Institute.

在1970年，中国在许多SLBM相关技术上获得突破性进展，包括轻型核弹头（600~700公斤）由核工业第十四研究所发展，制导系统由中船重工717研究所发展；舰载计算机由航天771所发展；固体火箭发动机由第四空间研究院发展，发射系统由中船重工701研究所发展，惯性/天文/星形制导系统由中船重工707研究所发展。

A Computer program of the hot starting and shutdown transients of a simple pressurized liquid bipropellant rocket engine is given,based upon the idea and basic equations provided by W.T.Webber etal.and mainly applying priem's combnstion model and feeding system distribution para- meter model.The hot starting and shutdown transients are calculated on 441B-Ⅲ digital computer and the elementary results arc obtained.

本文依据 W.T.Webber 等人提供的思路和基本方程，基本采用了 Priem 的燃烧模型和管路系统分布参数模型，为简单的挤压式双元液体推进剂火箭发动机热启动——关车瞬变工作过程编写了计算机程序，并在441B—Ⅲ型电子计算机上进行了计算，得出了初步的结果。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新