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How do you increase thrust in a jet engine?
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Kam Freddy
Studied Mechanical Engineering & Aircraft Maintenance Engineering (Graduated 2019)
1y
The most popular method of Power Augmentation (for fighter jets especially) is undoubtedly the use of Afterburners.
F-15 taking off with afterburners
Fighter jets are usually equipped with a Low Bypass engines. Simply put, less air enters the secondary section. Most of air that gets sucked in goes through the primary section of the engine (the core). Military fighter jets use this type because it offers a good power to weight ratio.
Black arrow: Primary section (core).
White arrow: Secondary section - The air simply bypasses the core section of the engine so this air doesn’t go through compression
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Answered by
Ken VanderHorst
Author has 2.6K answers and 3.4M answer views
Updated Feb 9
There are only two way to increase thrust:
- Increase mass flow rate. (accelerate a greater mass of air.)
- Increase delta V. (accelerate the air mass to a higher speed.)
There are many many different ways to achieve the above. For example, when a turbojet engine is modified to become a turbo fan engine, the mass flow rate is increased. (and the delta V is reduced, but the mass flow rate increase is greater than the delta V reduction.) When an afterburner is added to an existing engine, the mass flow rate remains the same, but the delta V is increased. You can also increase the size of the engine, increase the turbine inlet temperature, increase the RPM of the engine, increase the compression ratio, add water injection, and a host of other detail changes that either increase 1 or 2 above, or both.