| name | neqsim-jet-fire-radiation-screening |
| calculation_basis | screening |
| version | 0.1.0 |
| description | Educational jet-fire thermal-radiation screening that estimates the radiative flux at a distance, or the distance to a target flux, using the public single-point-source flame radiation model. USE WHEN: a task needs a public, screening-level jet-fire radiation flux or a distance to a personnel/equipment thermal limit before detailed fire-consequence analysis. |
| last_verified | 2026-06-18 |
| requires | {"python_packages":[],"java_packages":[],"env":[],"network":[]} |
Jet Fire Radiation Screening
Use this skill for public, educational jet-fire thermal-radiation screening. It estimates the radiative heat flux at a given distance, or the distance to a target flux, from an ignited gas release using the open single-point-source flame model, so an agent can scope a fire hazard zone before detailed consequence analysis.
When to Use
- When a user asks roughly what radiation flux reaches a target distance.
- When an agent needs a quick distance to a personnel or equipment thermal limit.
- When examples must run without confidential plant layout or fire-tool data.
Inputs
release_rate: burning mass release rate mdot in kg/s.heat_of_combustion: lower heat of combustion Hc in J/kg, default 50e6.radiant_fraction: fraction of heat released as radiation Xr, default 0.2.transmissivity: atmospheric transmissivity tau, default 1.0.distance: distance to the target in m (for flux), optional.target_flux: target radiation flux in kW/m2 (for distance), optional.
Outputs
total_radiative_power_kw: total radiative power emitted by the flame.radiation_flux_kw_m2: flux at distance, or null if no distance given.distance_to_target_m: distance to target_flux, or null if no target given.radiation_warning: ok, watch, high, severe, or no-distance.assumptions: public assumptions used by the placeholder model.
Engineering Method
The Python class JetFireRadiationModel uses the public single-point-source flame model:
- the radiative power uses
Q_rad = tau * Xr * mdot * Hc.
- the flux at a distance uses
q = Q_rad / (4 pi r^2).
- the distance to a target flux inverts the same relation:
r = sqrt(Q_rad / (4 pi q_target)).
- the warning compares the flux to public thermal limits: a personnel limit (default 4.7 kW/m2), an equipment limit (default 12.5 kW/m2), and a 37.5 kW/m2 severe limit.
This is educational and screening-only logic. It assumes full combustion of the released mass, isotropic emission with no view factor, and no flame shape, length, or wind tilt. It is not a replacement for validated fire modelling, solid-flame or CFD radiation tools, and qualified safety review.
Python Usage Pattern
from jet_fire_radiation_screening import JetFireRadiationModel
model = JetFireRadiationModel()
result = model.evaluate(
release_rate=10.0,
target_flux=12.5,
)
print(result.total_radiative_power_kw)
print(result.distance_to_target_m)
print(result.radiation_warning)
Related NeqSim Functionality
For validated fire-consequence behaviour, redirect to existing NeqSim classes:
neqsim.process.safety.fire.JetFireModel — jet-fire flame and radiation modelling.neqsim.process.safety.fire.PoolFireModel — pool-fire radiation modelling.neqsim.process.safety.fire.BLEVECalculator — BLEVE fireball thermal dose.
This skill is a public radiation triage layer that decides when to invoke those validated fire classes.
Validation Checklist
Common Mistakes
| Symptom | Cause | Fix |
|---|
| Flux too high near source | Point source over-predicts close in | Use a solid-flame NeqSim model near the flame |
| No flux reported | distance not supplied | Pass distance or target_flux |
| Wrong power | Hc given per mole not per kg | Use J/kg for the heat of combustion |
Limitations
- Point-source emission; no flame length, shape, or view factor.
- No wind tilt, lift-off, or partial combustion.
- No transient or impinging-fire effects.
References
