Scaling of Gas-Jet Flame Lengths in Elevated Gravity

2008 ◽  
pp. 269-279
Author(s):  
Peter B. Sunderland ◽  
David L. Urban ◽  
Vedha Nayagam
Keyword(s):  
Gas Jet ◽  
Jet Flame

Numerical Modeling of a Turbulent Gas Jet Flame in a Swirling Air Stream

2002 ◽  
Author(s):  
Ala R. Qubbaj ◽  
S. R. Gollahalli ◽  
John Villarreal
Keyword(s):  
Numerical Simulation ◽  
Software Package ◽  
Reaction Model ◽  
Swirl Flow ◽  
Gas Jet ◽  
Combustion Analysis ◽  
Jet Flame ◽  
Benchmark Study ◽  
Air Stream ◽  
Mixing Rates

A numerical simulation of a turbulent natural gas jet diffusion flame at a Reynolds number of 9000 in a swirling air stream is presented. The numerical computations were carried out using the commercially available software package CFDRC. The instantaneous chemistry model was used as the reaction model. The thermal, composition, flow (velocity), as well as stream function fields for both the baseline and airswirling flames were numerically simulated in the near-burner region, where most of the mixing and reactions occur. The results were useful to interpret the effects of swirl in enhancing the mixing rates in the combustion zone as well as in stabilizing the flame. The results showed the generation of two recirculating regimes induced by the swirling air stream, which account for such effects. The present investigation will be used as a benchmark study of swirl flow combustion analysis as a step in developing an enhanced swirl-cascade burner technology.

Turbulent Gas Jet Flames in Cross-Flow at Low Momentum Flux Ratios

1994 ◽  
Author(s):  
S. R. Gollahalll ◽  
B. Nanjundappa
Keyword(s):  
Momentum Flux ◽  
Flame Structure ◽  
Axisymmetric Flow ◽  
Cross Flow ◽  
Flux Ratio ◽  
Gas Jet ◽  
Jet Flame ◽  
Flow Recirculation ◽  
Two Dimensional Flow ◽  
The Stability

An experimental study of the stability and structure of a propane gas jet flame in cross-flow at a low jet to cross-flow momentum flux ratio (0.024) is presented. The flame structure is characterized by two distinct zones. A two-dimensional flow recirculation zone attached to the burner tube in its wake forms the first zone. An axisymmetric flow follows the first zone downstream. The junction of the two zones is characterized by an intense mixing of jet and cross-flow streams. This paper deals with the structure of the first zone. The temperature and concentration profiles show that the physico-chemical processes and combustion in that zone are diffusion controlled.

LIF-LII measurements in a turbulent gas-jet flame

1997 ◽  
Vol 23 (4) ◽  
pp. 281-287 ◽  
Author(s):  
R. L. Vander Wal
Keyword(s):  
Gas Jet ◽  
Jet Flame

Computation of Nitric Oxide and Soot Emissions From Turbulent Diffusion Flames

1985 ◽  
Vol 107 (1) ◽  
pp. 48-53 ◽  
Author(s):  
T. Ahmad ◽  
S. L. Plee ◽  
J. P. Myers
Keyword(s):  
Diffusion Flames ◽  
Soot Oxidation ◽  
Air Entrainment ◽  
Reaction Rates ◽  
Gas Jet ◽  
Maximum Temperature ◽  
Injection Velocity ◽  
Soot Emission ◽  
No Emission ◽  
Jet Flame

An existing steady-state, locally homogeneous flow model of turbulent spray combustion was modified to predict NO emission from a spray flame and soot emission from a gas-jet flame. The effect of turbulent fluctuations on the reaction rates was accounted for. The predicted NO emission from an n-pentane spray with a changing injection velocity could be correlated with the convective time scale of the flow. Calculation of soot emission from a burning turbulent gas jet indicated that the centerline soot concentration reaches a peak upstream of the maximum temperature location and then decreases due to soot oxidation and dilution by air entrainment.

Elliptic Coflow Effects on a Circular Gas Jet Flame

2002 ◽  
Vol 18 (3) ◽  
pp. 686-695 ◽  
Author(s):  
Ahsan R. Choudhuri ◽  
Sayela P. Luna ◽  
S. R. Gollahalli
Keyword(s):  
Gas Jet ◽  
Jet Flame

scholarly journals Experimental Study on the Thermal Effect according to the Distance around a Hydrogen Jet Flame

2021 ◽  
Vol 35 (6) ◽  
pp. 15-20
Author(s):  
Ohseung Kwon ◽  
Keonho Cho ◽  
Kyung-Hwan Park
Keyword(s):  
Vertical Direction ◽  
Hydrogen Gas ◽  
Fire Fighting ◽  
Gas Jet ◽  
Safe Distance ◽  
Storage Container ◽  
Jet Flame ◽  
Thermally Activated ◽  
Device Operation ◽  
Resistant Structure

In this study, the safe distance in the case of a hydrogen vehicle fire was analyzed according to the temperature distribution around a hydrogen gas jet flame formed by the thermally activated pressure relief device operation of a hydrogen storage container. The experiment was conducted while 70 MPa hydrogen gas was released from a 1.8-mm-diameter nozzle to a 1.8- × 1.8 m fire-resistant structure wall for distances of 2 and 4 m between the nozzle output and the wall. To analyze the temperature around the hydrogen gas jet flame, five fire-fighting heat-protective hood test samples, certified by the Korea Fire Institute, and temperature sensors were installed every 1 m from the center of the jet flame in the vertical direction to the direction of the flame. In the experiment, the temperature around the jet flame was measured to observe the safe distance for firefighters. The results show that the safe distances at 70°C or less, which is harmless to firefighters, were 5 m without a heat-protective hood and 3 m with a heat-protective hood. In addition, it was confirmed that the direction of the jet flame and blocking by obstacles affect the safe distance during fire-fighting and rescue activities by firefighters.

Stability of lifted laminar round gas-jet flame

1986 ◽  
Vol 165 (-1) ◽  
pp. 297 ◽  
Author(s):  
Ö. Savas ◽  
S. R. Gollahalli
Keyword(s):  
Gas Jet ◽  
Jet Flame

Attaching Characteristics of the Natural Gas Jet Flame in Air-Coflow at Various Conditions

2015 ◽  
Vol 141 (4) ◽  
pp. 04014042 ◽  
Author(s):  
Ye Yuan ◽  
Guo-Xiu Li ◽  
Zi-Hang Zhou ◽  
Zuo-Yu Sun
Keyword(s):  
Natural Gas ◽  
Gas Jet ◽  
Jet Flame

An Experimental and Computational Study of Interaction between Water Mist and Gas Jet Flame

2011 ◽  
Vol 130-134 ◽  
pp. 1720-1724
Author(s):  
Xian Jia Huang ◽  
Xi Shi Wang ◽  
Jia Lu ◽  
Zhong Jun Ding ◽  
Guan Xuan Liao
Keyword(s):  
Open Space ◽  
Computational Study ◽  
Water Mist ◽  
Experimental Result ◽  
Gas Jet ◽  
Discrete Phase Model ◽  
Jet Flame ◽  
Burner Exit ◽  
Fuel Flow ◽  
Dissipation Model

The experiment on gas jet flame extinguishing with water mist in open space was conducted in this paper. On the basis of experimental result, the process of the flame extinguishment can be classified into two categories:1) when fuel flow rate is small, the gas jet flame can be suppressed and extinguished quickly; 2) When fuel flow is large, the flame lifts from the attached position at the burner exit after suppressed by the water mist. FLUENT is used to simulate the interaction of water mist with gas jet flame. The Eddy-dissipation model (EDM) is used for combustion of flame. the water mist is simulated by Discrete Phase Model (DPM).The simulated results agree well with the experimental results. To some extent, EDM is suitable for simulating the interaction of water mist with a turbulent gas jet flame.

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