Thermodynamics And Statistical Mechanics

Aerothermodynamics of Aircraft Engine Components (AIAA by Gordon C. Oates

By Gordon C. Oates

Starting with the elemental ideas and ideas of aeropropulsion combustion, this article is going directly to discover particular procedures, boundaries and analytical equipment as they undergo on part layout. The textual content good points invited paintings of favorite experts in airplane fuel turbine engines.

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This empirically determined parameter represents the energy released per mass of fuel upon complete combustion when both the initial and final temperatures are nearly 25°C. The actual experiment involves a combustion bomb pressurized with pure oxygen immersed in a well-insulated water bath. The temperature rise of the water (usually only a few degrees Centigrade) is determined and the energy necessary to cause this increase for the entire system is determined. This value, which is calculated as negative for exothermic combustion reactions, is the constantvolume higher heating value.

7 cruise. At these speeds, afterburning is required even during cruise to obtain a reasonable air specific thrust. Finally, with the advent of the turbofan engines in the late 1960s and the variable-cycle engines in the 1970s, the afterburner must be viewed as one of an increasing number of devices that can be used to enhance the flexibility of the basic gas turbine cycle. The aim of these systems is to optimize engine performance over the widest possible range of operating conditions. Augmentation can be used in both fan and core streams.

However, when the afterburner is used for a small part of a flight, the weight reduction is more important than the increase in fuel consumption. In the middle 1960s, an augmented gas turbine engine, the General Electric GE4, was selected as the cycle to be used on the Boeing supersonic transport. It was an afterburning turbojet engine and the afterburner was used not only during takeoff or transonic acceleration, but also during the 47 48 AIRCRAFT ENGINE COMPONENTS Fig. 1 General Electric J-79 afterburner:.

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