Maximum flame temperature and burning rate of combustible mixtures

1982 ◽  
Vol 19 (1) ◽  
pp. 267-274 ◽  
Author(s):  
Asok K. Sen ◽  
G.S.S. Ludford
Keyword(s):  
Burning Rate ◽  
Flame Temperature ◽  
Combustible Mixtures

Experimental Study of Fire Behavior in a Depressurized Aircraft Cargo Compartment

2017 ◽  
Author(s):  
Cong Li ◽  
Yina Yao ◽  
Zhenxiang Tao ◽  
Rui Yang
Keyword(s):  
Burning Rate ◽  
Oscillation Frequency ◽  
Dynamic Pressure ◽  
Flame Temperature ◽  
Fire Behavior ◽  
Federal Aviation Administration ◽  
Pressure Control ◽  
Rate Oscillation ◽  
Pressure Control System ◽  
Fire Experiments

To analyze the fire behavior in the dynamic pressure environment, a series of n-heptane pool fire experiments were conducted in an 8.11m × 4.16m × 1.67m simulated aircraft cargo compartment. The compartment is capable of mimicking flight environment from taking off to landing of the aircraft according to the standards of Federal Aviation Administration (FAA) by a pressure control system. Pool fires with 30cm diameter were tested under the dynamic pressure from 101kPa to 45kPa with various depressurization rates of 10kPa/min, 15kPa/min, 20kPa/min and 25kPa/min. Fire behavior such as burning rate, oscillation frequency and flame temperature were analyzed. The results revealed that the dynamic pressure influences the burning rate not only during the depressurization stage but also after depressurization. The oscillation frequency increases with the pressure decrease but has no relationship with depressurization rate. The flame temperature at different heights shows various tendencies with pressure.

Theoretical Analysis of Diffusion Flames Using Perturbation Method for Different Lewis and Damkohler Numbers

2013 ◽  
Vol 29 (2) ◽  
pp. 345-354 ◽  
Author(s):  
Mehdi Bidabadi ◽  
Payam Asadollahzadeh ◽  
Mohammad N. P. Meibudy
Keyword(s):  
Perturbation Method ◽  
Burning Rate ◽  
Heat Loss ◽  
Reaction Zone ◽  
Diffusion Flames ◽  
Flame Temperature ◽  
Asymptotic Model ◽  
Radiation Heat ◽  
Exponential Parameter ◽  
Radiation Heat Loss

AbstractThis paper presents a two dimensional asymptotic model of counterflow diffusion flame in the presence of radiation heat loss. The fuel and oxidizer, respectively, are injected from left and right hand side of the flame. The effects of burning rate, Lewis and Damkohler number on the structure and extinction of the flame is studied using perturbation method. To do so, the structure of the flame is considered to be composed of reaction zone with a thickness of O(ε) and radiation heat loss zone, of O(δ) thickness, that sandwiches the reaction zone. The effect of burning rate is illustrated by burning pre-exponential parameter, B. It is found that with the increase of the parameter, the flame temperature is also increased, and flame location moves toward the fuel side. In addition, the variation of Lewis number of fuel and oxidizer has a significant effect on the location and temperature of the flame.

Effect of Quarl on N2- and CO2-Diluted Methane Oxy-Flames Stabilized by an Axial-Plus-Tangential Swirler

2016 ◽  
Author(s):  
Paul Jourdaine ◽  
Clément Mirat ◽  
Jérôme Beaunier ◽  
Jean Caudal ◽  
Youssef Joumani ◽  
...  
Keyword(s):  
Bluff Body ◽  
Flame Temperature ◽  
Leading Edge ◽  
Test Rig ◽  
Flexible Control ◽  
Laser Tomography ◽  
Swirling Flames ◽  
Flame Shape ◽  
Combustible Mixtures ◽  
Oil Particles

Stabilization of nearly stoichiometric CO2- and N2-diluted premixed methane/oxygen swirling flames is investigated in an atmospheric test rig equipped with an axial-plus-tangential swirler exhausting in a cylindrical injection tube eventually ended by a diverging quarl. The investigated flames are stabilized aerodynamically away from the solid elements of the combustor without the help of any central bluff body in the injector. The flowrates through the axial and tangential slits of the swirler can be adjusted separately. Effects of swirl and quarl angle on the flowfield and flame shape are analyzed. Laser tomography on small oil particles reveals that fuel, oxidizer and diluents injected in separated channels are well mixed at the injector outlet. Velocimetry measurements and flame images show that the axial-plus-tangential swirler allows a flexible control of the flame leading edge position with respect to the injector outlet. For a fixed injector geometry with a given quarl angle and swirl number, it is found that N2- and CO2-diluted flames feature the same topology if the injected combustible mixtures feature the same adiabatic flame temperature, while they may feature different bulk injection velocities and laminar burning velocities. The operability range of well stabilized CO2-diluted flames is however reduced.

Study on Burning Characteristics of Small-Scale Ethanol Pool Fire in Closed and Open Space Under Low Air Pressure

2011 ◽  
Author(s):  
Yi Zeng ◽  
Jun Fang ◽  
Ran Tu ◽  
Jinjun Wang ◽  
Yongming Zhang
Keyword(s):  
Burning Rate ◽  
Open Space ◽  
Flame Temperature ◽  
Pool Fire ◽  
Air Pressure ◽  
Small Scale ◽  
Pulsation Frequency ◽  
Pool Fires ◽  
Closed Space ◽  
Ambient Conditions

This paper presents results of different burning rates of small-scale ethanol pool fires at pressures of 0.6∼1.0 atm in closed and open space. Experiments were performed using a square burner of side length of 4 cm under two different conditions: one was taken in a closed low air pressure cabin (0.5 m3, the interior pressure ranges from 0.6–1.0 atm); another was taken in open space respectively in Hefei (air pressure: 1.0 atm) and Lhasa (air pressure: 0.66 atm). The pool fire characteristics including the burning rate, the axial temperature and pulsation frequency of flame were measured. In closed space, the burning rate, flame temperature, and pulsation frequency of small-scale ethanol pool fires decreased with the decreasing pressure, while in open space they increased when the air pressure reduced. As a result of different ambient conditions and oxygen depletion, the burning rate, flame temperature and pulsation frequency were lower at lower air pressure in closed space but were higher at higher air pressure in open space.

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