Plume Collapsing Predictor

What This Tool Does

The tool turns the current project logic into a browser workflow. It does not replace CFD or a validated spray-imaging campaign. Its job is to let a user enter injector geometry and operating condition, then inspect how plume centerlines project in 3D, how cross sections behave at 5, 10, 20, and 50 mm, and whether the case trends toward a collapse-prone branch.

Recommended Input Order

1. Coordinates plus axis angles: preferred mode. If hole center coordinates and theta_x, theta_y, theta_z are known, the tool can use explicit per-hole directions.
2. Coordinates only: still useful. Hole layout comes from measured coordinates, while direction falls back to the shared drill-angle model.
3. STL: support mode only. STL extraction currently provides opening centers, not production drill angles.

Included Demo Presets

• ECN Spray G: nominal 8-hole ring geometry with a G2-like default condition.

The current default demo condition is G2-like: 200 bar injection, 0.5 bar ambient, 90 C fuel temperature, and 20 C ambient temperature. Geometry changes with the preset; the condition stays on the same baseline unless the user edits it.

Current Scope

• 3D plume centerline and cone projection
• Section views at 5, 10, 20, and 50 mm
• Pressure-ratio-based regime split
• Pairwise gap and explicit overlap diagnostics
• Collapsing probability estimate

Important Limits

• This is a predictor surface, not a calibrated certification model.
• Non-flash plume angle still depends on a user baseline anchor.
• Flare handling is conservative and should be interpreted with the merged-envelope view.
• STL mode is geometry support only. When measured coordinates exist, coordinate mode is the correct path.