By Major Oleksandr
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Jet Engine Basics, Metrics, and Technological Trends 11 ting. Most early jet engines were turbojets. However, with some exceptions, such as some small and relatively inexpensive turbojets designed for one-time-use missile applications, modern jet engines have evolved into more-complicated devices called turbofan engines. A turbofan engine is more complex and more efficient than a turbojet. A turbofan adds a second compressor, called a fan, a low-pressure turbine to drive the fan, and an annular-shaped bypass duct that allows part of the fan’s discharge air to flow around the high-pressure compressor, combustor, and both turbines.
Prognostics and Engine Health Management Advanced engine health monitoring systems, including prognostics and diagnostics, along with electronic technical manuals, should reduce the total labor required to maintain engines and allow maintenance crews to plan for and accomplish preventative maintenance more effectively. The concept of monitoring engine performance has been around as long as engines themselves. However, the large advances in computing power, rugged and miniaturized sensors, artificial neural networks (ANNs),4 and diagnostic and prognostic algorithms will permit the incorporation of intelligent and responsive health assessment systems to improve engine reliability, predict degradation or failure, and prescribe corrective actions.
3—Turbojet and Turbofan Thrust-to-Weight Trends Since 1950 of air per second, or kg of air per second) is also an indication of the size of an engine and an indication of the size of inlet required. Overall pressure ratio (OPR) is the dimensionless ratio of the pressure of the air exiting the high-pressure compressor to the pressure of the air entering the fan on a turbofan engine, or entering the compressor on a turbojet, turboprop, or turboshaft. High OPR contributes to high engine efficiency and, in turn, low SFC.