说New words

•        Ancillary辅助的

•        Correspondingly相应地

•        Radialdrilling 径向孔

•        Overriding覆盖、取代

•        Dashpot缓冲器、阻尼器

•        Sleeve套筒

•        Rack 机架、齿条

•        Pinion小齿轮

•        Equilibrium平衡

•        Capsule膜片、胶囊

•        Evacuated真空

•        Fuelspecific gravity 燃油比重

•        Solenoid线圈

•        Kineticvalve 动力活门

•        Altitudesensing unit 高度传感装置

•        Accelerationcontrol unit 加速控制装置

•        Equalize均衡

•        Inertia惯性

•        Lag 滞后

•        Fuelmetering plunger 燃油节流柱塞

•        Permissible允许的

•        Underneath在下面

•        Rockerarm 摇臂

•        Triangular三角形

•        Stirruparm 托架臂

•        Overselling过量

•        Rotaryactuator 旋转作动筒

•        Flyweight配重

•        Resetcam 重调凸轮

•        Fullauthority fuel control 全权限燃油控制器

•        Datum 基准

•        Supervisory监督的、管理的

•        Vapourlocking 汽化阻塞

•        Cavitation气穴

•        Bore 孔

•        Camplate凸轮盘

•        Inclination倾斜度

•        Biase 有偏差的

•        Tangentially切向

•        Slot 狭槽

•        Simplex单油路喷嘴

•        Lubbock可调进口喷嘴

•        Duplex双油路喷嘴

•        Duple双油路喷嘴

•        Luminosity光度、亮度

•        Calorific热量的、发热的

•        Volatility挥发性

•        Sulphur硫磺

•        Drain 排出

•        Additives添加剂

•        Undissolvedwater 不溶于水

•        Microbiological微生物学

读Sentence

•        3.With the turbo-propeller engine, changes in propeller speed and pitch have tobe taken into account due to their effect on the power output of the engine.Thus, it is usual to interconnect the throttle lever and propeller controllerunit, for by so doing the correct relationship between fuel flow and airflow ismaintained at all engine speeds and the pilot is given single-lever control ofthe engine. Although the maximum speed of the engine is normally determined bythe propeller speed controller, over-speeding is ultimately prevented by agovernor in the fuel system.

•        9.Typical high pressure (H.P.) fuel control systems for a turbo-propeller engineand a turbo-jet engine are shown in simplified form in fig. 10-3, eachbasically consisting of an H.P. pump, a throttle control and a number of fuelspray nozzles. In addition, certain sensing devices are incorporated to provideautomatic control of the fuel flow in response to engine requirements. On theturbo-propeller engine, the fuel and propeller systems are co-ordinated toproduce the appropriate fuel/r.p.m. combination.

•        12. Atsteady running conditions, at a given air intake pressure and below governedspeed, the spill valve in the F.C.U. is in a sensitive position, creating abalance of forces across the fuel pump servo piston and ensuring a steadypressure to the throttle valve.

•        19.When the throttle is opened, the control valve closes the low pressure (L.P.)fuel port in the sleeve and the throttle servo pressure increases. The throttlevalve moves towards the selected throttle position until the L.P. port opensand the pressure balance across the throttle valve is restored. The decreasingfuel pressure difference across the throttle valve is sensed by the pressuredrop control diaphragm, which closes the spill valve to increase the pump servopressure and therefore the pump output. The spill valve moves into thesensitive position, controlling the pump servo mechanism so that the correctfuel flow is maintained for the selected throttle position.

•        29. Aflow control fuel system is generally more compact than a pressure controlsystem and is not sensitive to flow effect of variations downstream of thethrottle. The fuel pump delivery pressure is related to engine speed; thus, atlow engine speeds pump delivery pressure is quite low. The fuel pump output iscontrolled to give a constant pressure difference across the throttle valve ata constant air intake condition. Various devices are also used to adjust thefuel flow for air intake pressure variations, idling and acceleration control,gas temperature and compressor delivery pressure control.

•        44.The control of servo pressure by the hydro- mechanical governor is very similarto that of the pressure control governor, except that the governor pressure isobtained from pump delivery fuel passing through a restrictor and therestricted pressure is controlled by a rotating spill valve; this type ofgovernor is unaffected by changes in fuel specific gravity.

•        53. Atany steady running condition, the engine speed is governed by the regulatorcontrolling the fuel flow. The fuel pump delivery is fixed at a constant valueby applying the system pressure difference to the fuel pump servo piston. Thisis arranged to balance the servo piston spring forces.

•        87.The fuel pump consists of a rotor assembly fitted with several plungers, theends of which project from their bores and bear on to a non-rotating camplate.Due to the inclination of the camplate, movement of the rotor imparts areciprocating motion to the plungers, thus producing a pumping action. The strokeof the plungers is determined by the angle of inclination of the camplate. Thedegree of inclination is varied by the movement of a servo piston that ismechanically linked to the camplate and is biased by springs to give the fullstroke position of the plungers. The piston is subjected to servo pressure onthe spring side and on the other side to pump delivery pressure; thusvariations in the pressure difference across the servo piston cause it to movewith corresponding variations of the camplate angle and, therefore, pumpstroke.

读全文并回答以下问题：

•       Whatis the function of the fuel system?

•       Listthe factor which can affect the adjustment of fuel flow？

•       Whatis the working principle of the speed governor?

•       Whatis the function of the back pressure valve?

•       Describethe L.P. shaft r.p.m. governor.

•       Describethe classification of the fuel pump.

•       Whatdoes a satisfactory ignition depend on?