Afterburner development
The afterburner remains in development. Its operating point and measured effect will be published only after the core engine state has been verified.
First project · Student-built turbojet
Meet Jotun.
Our first student-designed afterburning turbojet.
Explore the system
I · THE OBJECTIVE
What is Jotun?
A complete gas turbine.
From a blank page.
Jotun is Jet NTNU’s first engine project. It is a compact turbojet with an afterburner, divided into six stations: inlet, compressor, combustor, turbine, afterburner, and nozzle. Building it brings thermodynamics, aerodynamics, structures, manufacturing, controls, and testing into one project.
Jotun cycle data
Brayton cycle.
Station by station.
Station1Inlet
- T₀
- 14.85 °C (288.00 K)
- s
- 0.000 kJ/(kg·K)
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Δh₀ = U₂cθ₂ − U₁cθ₁
02 · Compression
Making pressure
from motion.
The compressor converts shaft work into pressure. Jotun’s compressor work uses Euler work, velocity triangles, loading, flow coefficient, reaction, diffusion limits, and slip to connect blade speed to pressure rise.
- Euler work and velocity-triangle development
- Diffusion, slip, and loading checks
- Geometry and performance will be published after design review
03 · Combustion
Four flames.
One purpose.
Four can combustors operate in parallel. Flow is distributed through primary, secondary, and dilution zones to support flame stability, combustion, and a controlled turbine inlet profile.
- Primary, secondary, and dilution-zone development
- Fuel delivery and flame-stability work
- Pressure-loss and liner-durability assessment
04 · Turbine
The critical
balance.
The turbine must extract exactly enough work to drive the compressor while surviving the engine’s most demanding combination of temperature, rotational speed, and centrifugal load. Work matching ties both machines to the same shaft.
- Blade-root stress governed by material, geometry, and speed
- Reaction, loading, and flow coefficient shape the stage
- Thermal and mechanical limits require verification before operation
05–06 · Reheat and exhaust
Verification
before figures.
Nozzle development
The nozzle geometry will be matched to verified mass flow, pressure, temperature, and test data before performance figures are published.
How we build
Design what matters.
Buy what must work.
Static first
Controlled spool-up, a limited operating hold, and spool-down create a disciplined first test envelope.
Evidence before claims
Materials, temperatures, operating limits, and performance figures remain provisional until analysis and testing support them.
The work continues