Turbojet engine

In fact, the clearly posed problem of the final state of an unstable laminar flame is a limiting case of turbulent flame for vanishing initial turbulence of the oncoming flow, but the general case, for any initial velocity fluctuations, is clearly of great interest in practical devices such as spark-ignited engines, turbojet, or gas turbine combustion chambers. 

Dispersed mixtures of boron and another metal are used as deoxidizing and degassing agents to harden steel (qv) (5,6), to increase the conductivity of copper (qv) in turbojet engines, and in the making of brass and bronze (see Copper alloys). Two examples are alloys of ferroboron and manganese boron. 

English inventor Frank Whittle patents the basic design of the turbojet engine. 

The subject of chemical reactions under supercritical conditions is well outside the scope of matters of major concern to combustion related considerations. However, a trend to increase the compression ratio of some turbojet engines has raised concerns that the fuel injection line to the combustion chamber could place the fuel in a supercritical state that is the pyrolysis of the fuel in the line could increase the possibility of carbon formations such as soot. The... 

Figure 30.5 Comparison of specific impulse and flight Mach number for hydrogen (1) and hydrocarbons (2). PDE performance estimated using ASI Performance deck turbojet, ramjet, and scramjet performance levels reflect well-designed systems for man-rated thrust classes. TJ — turbojets RJ — ramjets SJ — scramjets PDE — pulse detonation engines PIL — preignition hmit [12]...

THE MISSILE — propelled by a Teledyne turbojet engine - is 17.5 feet long, weighs 1100 j pounds, and carries a conventional warhead. It flies at wave height under midcourse inertial guidance until the radar seeker locks onto the target. The missile climbs for a brief instant near the target, then dives on it... 

For propulsion in the atmosphere, where ambient air is available, this air may be induced by the jet engine in order to participate essentially in the chemical transformation of the fuel the engine is then properly called an air flow jet engine (in Fig 1 the Turboprop, Turbojet, Ramjet Pulse Jet are examples of air flow jet engines) in contrast to the rocket, which does not use any air and is the only jet engine which can be used for propulsion in vacuum... 

Engine Jet Development Turbojet Development Ramjet Development Development of Intermittent Jets Other Forms of Air Flow Jet... 

A similar mixture was used for starting the turbo starters of Armstrong-Siddeley Sapphire turbojet engines. The charge weighed 5 lb and burned one-sidedly from the central hole. The burning time was 10 sec, and the pressure developed was 750 lb/in2. 

FFAR F GOOSE code name for air- to-air missile with turbojet engine... 

Variations in turbojet engine altitude, flight speed, and thrust require combustion to be maintained over a wide range of inlet air and fuel environment. Furthermore, the combustion must be nearly complete in order to achieve maximum aircraft range. Combustion limits and efficiency are, then, two major performance criteria of the turbojet combustion system. Under conditions very favorable to combustion, the influence of operating, design, and fuel variables are minimized, and only in adverse combustion environment is their influence measurable. 

Effect of Petroleum Fuel Properties. Three primary requirements must be met by practical fuels for aircraft turbojets. These requirements are They must be available in large quantities at low cost, they must produce satisfactory performance in all types of engines, and they must be suitable for aircraft fuel systems. Petroleum fuels vary in volatility, chemical composition, and concentrations of minor nonhydrocarbon compo-... 

Starting of turbojet engines is more difficult at altitudes or at low ambient temperatures on the ground. Altitude ignition is required after flame-outs or with multiengine aircraft where all engines may not be operated at all times. 

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