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Numerical Investigation on Temperature Profile of Horizontally Oriented Subsonic Jet Fires with Square Fuel Source

  • Youbo Huang
  • Yanfeng LiEmail author
  • Bingyan Dong
Conference paper

Abstract

The temperature profile of horizontally oriented jet flame with square fuel source has rarely been investigated in past years; especially, the effect of fuel portal geometry aspect ratio on temperature distribution of horizontally oriented jet flame has little appeared in the previous literature. In order to study the temperature profile of horizontal jet fire, a numerical simulated code was carried out to simulate horizontal jet fire with square fire source and natural gas as fuel. The fuel jet velocity was varied from 27.5 to 205.8 m/s. The temperature distribution features on horizontal and vertical directions were investigated, and the temperature prediction model was amended. The results show that the temperature is influenced by fuel jet velocity heavily. The heat release rate increases linearly with fuel jet velocity, and the slope is 29.1. The horizontal maximum temperature on orifice centerline direction rises from 304.5 to 614.8 °C with fuel jet velocity increase. The predicted model is modified to apply to horizontal jet fire, and the predictions by amended model agree well with simulated data.

Keywords

Jet flame Temperature distribution Square fuel source Fire safety Heat release rate 

Nomenclature

b

Flame width (m)

Cp

Constant pressure specific heat, J/(kg·K)

CT, C1

Constants

D*

Characteristic fire diameter

f

External force vector (kg/s2/m)

g

Gravitational acceleration (ms−2)

h

Sensible enthalpy (kJ/kg)

p

Pressure (Pa)

Q

Theoretical heat release rate (kW/m2)

q

Conductive and radiate heat fluxes (kW/m2)

R

Universal gas constant (J/(mol K))

t

Time (s)

T

Ambient temperature (K)

T

Temperature rise above ambient (K)

v

Velocity (m/s)

W

Molecular weight of the gas mixture (kg/mol)

y

Width (m)

Z

Height (m)

Greek symbols

β

Constant

ρ

Density (kg/m3)

τij

Viscous stress tensor (kg/s2/m)

κ

Coefficient

η

Coefficient

Φ

Dissipation rate (kW/m3)

Subscripts

0

Ambient

1

Per unit length

m

Centerline

int

Intermittent flame region

plu

Plume region

Notes

Acknowledgements

The authors wish to acknowledge the financial support from Beijing Natural Science Foundation under Grant No. 8172006; The National Nature Foundation of China under Grant No. 51378040.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.College of Architecture and Civil EngineeringBeijing University of TechnologyBeijingChina
  2. 2.School of Energy and Environmental EngineeringHebei University of TechnologyTianjinChina

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