电流
without causing any run-back icing to occur behind the heated areas.
14. A two-speed cycling system is often used to accommodate the propeller and spinner require-ments; a 'fast' cycle at the high air temperatures when the water concentration is usually greater and a 'slow' cycle in the lower temperature range. A typical cycling sequence chart is shown in fig, 13-5.
罗尔斯-罗伊斯公司
RB211-524 D4D发动机
1944年9月开始研制4000当量马力的“海神”（Proteus）涡轮螺桨发动机，原打算用作布里斯托尔公司的“布拉巴宗”2（Bristo
Brabazon 2）飞机和桑德斯-罗公司的“公主”（Saunders-Roe Princess）号飞机的动力装置。“海神”发动机于1947年元月首次试车，后来用作布里斯托尔公司的“大不列颠”（Britainnia）飞机的动力装置，功率4445当量马力。船用“海神”是从这种发动机发展而成，用来为各种巡逻艇、气垫船和水翼船提供动力。
Rolls-Royce RB211-524D4D
Work began in September 1944 on the 4000
e.h.p. Proteus turbo-prop originally intended to power the Bristol Brabazon 2 and Saunders-Poe Princess. The Proteus first ran in January 1947 and was later used to power the Bristol Britannia at 4445 e.h.p. A development of this engine, the Marine Proteus, is used to power various patrol boats,
布里斯托尔公司
“海神”发动机
Bristol Proteus hovercraft and hydrofoils.
绪言
1.所有燃气涡轮发动机及其相关的安装系统均具有将发动机起火的可能性减至最小的特性。然而关键是一旦发生了故障且引起火灾，应有立即探测起火、迅速灭火和防止火灾蔓延的措施。探测和灭火系统必须尽量轻便，以减轻对发动机装置所增加的重量。
14: Fire protection
第十四章 防火
灭火
火灾包容
火警探测
Contents
绪言
Introduction Prevention of engine fire 发动机起火的防范措施
ignition
External cooling and ventilation Fire detection Fire containment Fire extinguishing 发动机过热探测
Engine overheat detection
Page
153
外部冷却和通风
153
154 156 157 157
fireproof bulkhead from the combustion, turbine and jet pipe area, or 'hot' zone. The zones may be ventilated, as described in para 8, to prevent the accumulation of flammable vapours.
4. All pipes that carry fuel, oil or hydraulic fluid, are
INTRODUCTION
1. All gas turbine engines and their associated installation systems incorporate features that minimize the possibility of an engine fire. It is essential, however, that if a failure does take place and results in a fire, there is provision for the immediate detection and rapid extinction of the fire, and for the prevention of it spreading. The detection and extinguishing systems must add as little weight to the installation as possible.
PREVENTION OF ENGINE FIRE IGNITION
2. An engine/powerplant is designed to ensure that the prevention of engine fire ignition is achieved as far as possible. In most instances a dual failure is necessary before a fire can occur.
3. Most of the potential sources of flammable fluids are isolated from the 'hot end' of the engine. External fuel and oil system components and their associated pipes are usually located around the compressor casings, in a 'cool' zone, and are separated by a 发动机起火的防范措施
2.发动机／动力装置在设计上确保尽可能地实现防止发动机起火。在大多数情况下采用的是必须双重失效然后才会失火。
made fire resistant/proof to comply with fire regulations, and all electrical components and connections are made explosion-proof. Sparking caused by discharge of static electricity is prevented by bonding all aircraft and engine components. This gives electrical continuity between all the components and makes them incapable of igniting flammable vapour.
5.
On some engines, tubes carrying flammable fluids in 'hot areas' of the engine are constructed with a double skin. Should a fracture of the main fluid carrying tube occur the outer skin will contain any leakage, so preventing any possible fire ignition.
6.
The power plant cowlings are provided with an adequate drainage system to remove flammable fluids from the nacelle, bay, or pod, and all seal leakages from components are drained overboard at a position such that fluid cannot re-enter the pod and create a fire hazard.
7.
Spontaneous ignition can be minimized on aircraft flying at high Mach numbers by ducting boundary layer bleed air around the engine.
3.大部分存在着潜在火源的可燃液体均与发动机的“热端”相隔离。外部燃油和滑油系统的附件及导管通常分布在压气机机匣周围，即“冷”区内，并且通过防火隔板与燃烧室、涡轮、喷管区即“热”区相隔离。这些区域可通风，如第8段所述，以防止可燃蒸汽蓄积。
6.动力装置整流罩设有适当的漏油系统，以排泄短舱、机舱或吊舱中的可燃液体。所有从各附件的密封件处漏出的液体均从一个不会使这些液体重返吊舱并引起火灾的地方排出机外。
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：劳斯莱斯喷气引擎－中英(78)
