# How a Turbojet Engine Works, Step by Step

- Original post: https://www.twitter.com/i/status/2068632075284963740
- Source account: [@dreamsNscience](https://x.com/dreamsNscience)
- Source language: English
- Duration: 1:47
- Published: 2026-06-22
- Canonical URL: https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step

## Transcript

[0:00](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step) This is a fan. When it spins, it pushes air and creates thrust.

[0:04](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=4) But the thrust is too weak. So you place it inside a metal tube and add more blade stages.

[0:10](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=10) Yet the thrust still does not increase much.

[0:12](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=12) You quickly find the problem. After passing through one set of blades, the airflow changes direction and cannot efficiently drive the next set.

[0:21](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=21) So you add stationary guide vanes between the blades to redirect the airflow at the best angle.

[0:26](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=26) But fans alone still cannot produce enough thrust.

[0:29](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=29) So you add another set of blades inside a narrowing tube.

[0:33](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=33) As the fan spins, each stage compresses the air into a smaller space, creating hot, high-pressure air.

[0:40](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=40) Then you add a combustion chamber and fuel injectors.

[0:43](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=43) When fuel is sprayed in, the hot compressed air ignites it instantly, raising the temperature above 1,000 centigrade.

[0:50](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=50) The hot air expands rapidly and blasts out the exhaust, creating much greater thrust.

[0:56](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=56) But there is still a problem. The system depends on the front fan being powered.

[1:01](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=61) If power stops, the engine fails. So you add a turbine behind the combustion chamber.

[1:06](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=66) Hot gases spin the turbine as they pass through.

[1:09](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=69) You connect the turbine and compressor on the same shaft.

[1:12](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=72) Now exhaust drives the turbine, and the turbine drives the compressor, creating a self-sustaining cycle.

[1:18](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=78) But the engine becomes so efficient that temperatures exceed 2,000 centigrade, enough to melt turbine blades.

[1:25](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=85) So you split the airflow into two paths.

[1:28](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=88) One goes into the combustion chamber for burning fuel.

[1:31](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=91) The other bypasses the chamber and cools the system, lowering temperature to around 1,600 centigrade.

[1:39](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=99) Now the turbine survives, and the engine can run continuously.

[1:42](https://www.translate.mom/transcript/kuYPDnUKQrpJ/en/how-a-turbojet-engine-works-step-by-step?t=102) Congratulations, you have built a turbojet engine.