Why Do Fighter Jets Shoot Fire? Inside the Working of Afterburners

When a fighter jet takes off with a giant flame roaring out of its tail, it’s not just for show — that fire is a controlled explosion of power created by a device called an afterburner.
Afterburners give fighter jets the extra punch needed for supersonic speed, dogfights, and rapid climbs. But how do they actually work, and why don’t airliners use them?

Let’s break it down in a simple and technical way.

What Exactly Is an Afterburner?

An afterburner is a section installed behind the turbofan or turbojet engine's turbine.
Its job is simple:
👉 Inject more fuel directly into the hot exhaust
👉 Ignite it
👉 Create a massive boost in thrust

It works like turning your engine into a temporary rocket booster.

Why Do Fighter Jets Shoot Fire? Inside the Working of Afterburners

 🔥 How Afterburners Work (Explained Simply)

1. Air is compressed and burned in the main engine

The engine produces hot exhaust gases.

2. More fuel is added into this already-hot exhaust

Because the air still has unused oxygen, it can burn even more fuel.

3. The exhaust is ignited again

This creates a huge temperature spike.

4. The exhaust expands and shoots out faster

The result?
🚀 Massive thrust increase — sometimes 50% to 100% more.

That’s why afterburners create:

• Visible flames
• Shock diamonds
• Intense roaring sound
• Incredible acceleration

🛩️ Why Fighter Jets Need Afterburners

Afterburners are not used all the time. They are used when extreme thrust is required:

✔ Supersonic flight

Breaking the sound barrier requires immense force.

✔ Combat maneuvers

Dogfights demand quick changes in speed and altitude.

✔ Short takeoff

Military jets often need rapid acceleration from short runways.

✔ Avoiding threats

Missile evasion sometimes requires instant acceleration.

Afterburners give fighters the “kick” that no other system can match.

💸 The Drawback: Fuel Consumption

Afterburners burn fuel extremely fast.
A fighter jet on afterburner may empty its fuel tanks in 10–15 minutes.

This is the main reason commercial airliners never use afterburners — the fuel cost would be insane.

🔥 Which Aircraft Use Afterburners?

• F-22 Raptor
• F-35 Lightning II
• Su-30, Su-35, Su-57
• Eurofighter Typhoon
• Rafale
• MiG-29
• Older jets like F-16, F-15

All high-performance fighters rely on afterburners.

🫨 Visible Fire: Why the Flames?

The fire behind the jet is the burning fuel + expansion of exhaust.
The “shock diamonds” in the flame pattern show pressure waves — a signature of supersonic exhaust.

This is not for aesthetics — it’s physics in action.

🧠 Summary

• Afterburners inject fuel into the exhaust to give a massive thrust boost.
• They are used for takeoff, combat, and supersonic flight.
• They create visible flames and shock diamonds.
• They consume a huge amount of fuel, so only military aircraft use them.

Afterburners turn a fighter jet into a temporary flying rocket — raw power unleashed.