Info

"Multiply by 0.102 to convert to kg/hr-N. ^Multiply by 47.9 to convert to N/m2.

cSpecific impulse is a performance parameter and is defined in Chapter 2.

"Multiply by 0.102 to convert to kg/hr-N. ^Multiply by 47.9 to convert to N/m2.

cSpecific impulse is a performance parameter and is defined in Chapter 2.

w area, and thrust independence of altitude, enables extremely long flight ranges to be obtained in rarefied air and in space.

The turbojet engine is the most common of ducted engines. Figure 1â„¢1 shows the basic elements.

At supersonic flight speeds above Mach 2, the ramjet engine (a pure duct engine) becomes attractive for flight within the atmosphere. Thrust is produced by increasing the momentum of the air as it passes through the ramjet, basically as is accomplished in the turbojet and turbofan engines but without compressors or turbines, Figure 1-2 shows the basic components of one type of ramjet. Ramjets with subsonic combustion and hydrocarbon fuel have an upper speed limit of approximately Mach 5; hydrogen fuel, with hydrogen cooling, raises this to at least Mach 16. Ramjets depend on rocket boosters, or some other method (such as being launched from an aircraft) for being accelerated to near their design flight speed to become functional. The primary applications have been in shipboard and ground-launched antiaircraft missiles. Studies of a hydrogen-fueled ramjet for hypersonic aircraft look promising. The supersonic flight vehicle is a combination of a ramjet-driven high-speed airplane and a one- or two-stage rocket booster. It can travel at speeds up to a Mach number of 25 at altitudes of up to 50,000 m.

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Project Management Made Easy

Project Management Made Easy

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