Jet engine performance: Difference between revisions

Revision as of 21:34, 12 February 2025

Revision as of 13:35, 19 February 2025

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Performance criteria reflect the level of technology used in the design of an engine, and the technology has been advancing continuously since the jet engine entered service in the 1940s. It is important to not just look at how the engine performs when it's brand new, but also how much the performance degrades after thousands of hours of operation. One example playing a major role is the creep in/of the rotor blades, resulting in the aeronautics industry utilizing [[directional solidification]] to manufacture turbine blades, and even making them out of a [[single crystal]], ensuring creep stays below permissible values longer. A recent development are [[ceramic matrix composite]] turbine blades, resulting in lightweight parts that can withstand high temperatures, while being less susceptible to creep.{{citation needed|date=February 2025}}

The following parameters that indicate how the egine is performing are displayed in the cockpit: [[engine pressure ratio]] (EPR), [[exhaust gas temperature]] (EGT) and fan speed (N1). EPR and N1 are indicators for thrust, wheras EGT is vital for gauging the health of the engine,<ref>"EGT margin indicates engine health"' pp. 5–11, Safety first The Airbus Safety magazine, February 2022</ref>, as it rises progressively with engine use over thousands of hours, as parts wear, until it the engines has the be overhauled.