Tilt angle of turbulent jet diffusion flame in crossflow and a global correlation with momentum flux ratio

Wang, Jingwu; Fang, Jun; Lin, S.-B.; Guan, Jinfu; Zhang, Yongming

doi:10.1016/j.proci.2016.06.055

Cited by 30 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tang et al [22] demonstrated that, for small pool fires, flame tilt was more easily influenced by wind speed as opposed to larger fires. Similar studies have been done for pool fires in momentum-dominated regimes [23,24] and flame angle was shown to be a function of the cross-flow to burner vertical momentum ratio. Tang et al [25] studied the behavior of wind-blown gas burner flames in the presence of walls (walls parallel to cross-flow), which are potentially analogous to merging flames (entrainment restricted).…”

Section: Introductionsupporting

confidence: 65%

A Study of the Flow Field Surrounding Interacting Line Fires

Maynard¹,

Princevac

Weise

2016

Journal of Combustion

View full text Add to dashboard Cite

The interaction of converging fires often leads to significant changes in fire behavior, including increased flame length, angle, and intensity. In this paper, the fluid mechanics of two adjacent line fires are studied both theoretically and experimentally. A simple potential flow model is used to explain the tilting of interacting flames towards each other, which results from a momentum imbalance triggered by fire geometry. The model was validated by measuring the velocity field surrounding stationary alcohol pool fires. The flow field was seeded with high-contrast colored smoke, and the motion of smoke structures was analyzed using a cross-correlation optical flow technique. The measured velocities and flame angles are found to compare reasonably with the predicted values, and an analogy between merging fires and wind-blown flames is proposed.

show abstract

Section: Introductionsupporting

confidence: 65%

A Study of the Flow Field Surrounding Interacting Line Fires

Maynard¹,

Princevac

Weise

2016

Journal of Combustion

View full text Add to dashboard Cite

show abstract

“…3(d) and Fig. 3(e), this newly proposed 'back-to-back conical frustum' agrees well with the visible flame envelopes for buoyant jet diffusion flame (Wang, Fang, Lin, Guan, & Wang, 2017) as well as for pool fire flame (Tang, Li, Zhu, Qiu, & Tao, 2015).…”

Section: Resultssupporting

confidence: 80%

Impacts of longitudinal air velocity and fuel flow rate on flame radiative fraction in tunnel

Guo²,

Ding

et al. 2020

Sustainable Cities and Society

View full text Add to dashboard Cite

Fires in tunnels have attracted special attention in recent years due to catastrophic fires, which cause huge human and economic losses. For accurate fire modelling and ventilation system design, it is critical to understand the correct radiative fraction (Xr) of the flame. Recent study has proved that Xr decreases with the increase of longitudinal air velocity in heptane pool fires. However, the impacts of longitudinal air velocity and fuel flow rate on Xr in propane or liquefied petroleum gas tunnel fires have not been studied. To fill the gap, this paper conducts two sets of fire experiments in a 1/20 reduced-scale wind tunnel using a porous burner. Unique visible flame shapes are observed and described by the 'back-to-back conical frustum'. The geometric parameters and their variations with the momentum flux ratio are discussed. In comparison with the experimental results, the radiation model using the proposed flame shape shows an 80% accuracy. The predictive radiative fractions of the two tests are calculated and compared with other tests from literature. The coupling effects of longitudinal air velocity and fuel flow rate on the flame radiative fraction are studied in detail. And their influences on key parameters of smoke extraction system are analyzed.

show abstract

“…e ame shape is one of the most important and intuitive characteristics of combustion characteristics [34]. e ame video recorded in the low-pressure chamber was processed with grayscale and binarization [35,36]. e Complexity 6 emission.…”

Section: Flame Shapementioning

confidence: 99%

Combustion Characteristics of Horizontal Diesel Spray Burner in Low‐Pressure Chamber Based on Multivariate Correlation Analysis

et al. 2019

View full text Add to dashboard Cite

At present, the burning problem of low power burners widely used in emergency and stove heating on the plateau has gradually attracted people’s attention. The fuel injection pressure, inlet air flow, air distribution regulation coefficient, and environmental pressure were considered respectively, and then the four factors and six levels of a uniform experimental investigation were conducted in a low-pressure chamber with adjustable atmospheric pressure. The flame morphology, flame temperature, and NO emission were investigated, and their correlation with each independent variable was analyzed. In addition, burning of droplet swarm was obtained with the simulate numerical calculation by the ANSYS FLUENT. The results showed that the low-pressure environment had a negative correlation with the maximum width and position of flame, the characteristics of flame uplifted and NO emission. Air volume determines the length of the flame, and atmospheric pressure and fuel injection pressure determine the maximum width of the flame. The shape of the horizontal jet flame in plateau environment is more dependent on the regulation of air volume. In order to reduce NO emission in plateau environment, it may be necessary to maintain a large air supply volume and reduce fuel injection pressure appropriately. At the microscopic level of droplet combustion, change mechanisms of macro flame shape in different sub-atmosphere were analyzed. The mechanism of flame morphological change in the plateau environment is the increase in droplet burning time and path. The adjustment of flame under sub-atmospheric pressure through the change of operating parameters is essential to improve the burning rate of droplets.

show abstract

Tilt angle of turbulent jet diffusion flame in crossflow and a global correlation with momentum flux ratio

Cited by 30 publications

References 13 publications

A Study of the Flow Field Surrounding Interacting Line Fires

A Study of the Flow Field Surrounding Interacting Line Fires

Impacts of longitudinal air velocity and fuel flow rate on flame radiative fraction in tunnel

Combustion Characteristics of Horizontal Diesel Spray Burner in Low‐Pressure Chamber Based on Multivariate Correlation Analysis

Contact Info

Product

Resources

About