Lecture Notes: Jet Engine Ignition System and Testing

Ignition System Installation

Project Updates:
- Working on engine 2621.
- Upcoming focus on finishing engine 2920.
- Testing setup for engine 2621 ignition system.

Purpose: Ensure engine ignition system works before test cell trials.
Components:
- Power input supply.
- Sparkers to create sparks (highly dangerous).
- Ground system through outer jacket of the ignition line.
- Stainless steel jacket, Teflon-lined with steel core.
- Used during engine starting and as precaution against flame outs.
- Ignition generally off except during takeoff to prevent catastrophic failures.
Setup:
- Removed lead to sparker for number two can.
- Extra lead added to igniter.
- Ignition box takes 26-28 volts DC; using 25.5 volts for test.
- Two car batteries connected in series.
Observation:
- Look for small purple-blue spark.
- Listen for ignition sound.

Procedure:
- Power turned on to test sparker.
- Observation of spark and sound for confirmation.
Safety Note: Never get close to the sparkers due to high danger.
Results: Successful ignition observed.

Project Details:
- Built by Turbolon Turbines.
- Industrial version of aircraft engine.
- Simplified external components (oil pump and ignition system only).
- Painted Cerakote Silver with Cerakote Green combustors.
Testing:
- Runs on natural gas (clean start, no visible flame or smoke).
- Instrument screen shows temperature rise for ignition detection.
- Engine achieves medium and high power; temperature increases accordingly.

Filming the Engine:
- Attempted to capture heat glow from turbine.
- Challenges due to air distortion and distance (100-125 meters from engine).
- Camera zoom: 42 times magnification.
- Visual effect of engine appearing to turn slowly due to camera frame rate.
Jet Wash Alley:
- Filled with water which gets agitated during engine run.
- Created visual disturbances similar to ocean spray.