Direct measurement of laminar flame quenching distance in a closed vessel

Head-on Quenching of Transient Laminar Flame: Heat Flux and Quenching Distance Measurements

“…The DSAD is supplied by a home-made amplifier based on an AD624 instrumental amplifier providing amplification gain of 100-1000 with the frequency band width higher than 25 kHz. Bellenoue et al (2003) have shown that wall material influences the flame quenching. Therefore, in our tests the materials of the heat flux gauge and wall have been chosen as the same (Z38CDV5).…”

“…This exposure-time value was chosen as the minimum acceptable value if one wishes to have enough light to record the flame image and to obtain sharp images of the flame. In our earlier paper (Bellenoue et al, 2003), we gave a detailed description of the experimental procedure to measure quenching distance. Experimental errors related to the record of flame emission in the visible spectral interval and exposure time of the camera has been also discussed in detail in this paper.…”

“…Quenching distance has been measured as the thickness of dark space between the wall surface and the head of the luminous zone (Bellenoue et al, 2003;Daniel, 1957). Images of flame position in the vicinity of the wall have been treated to obtain the value of quenching distance.…”

“…It is much more difficult to measure the quenching distance for singlewall flame quenching (Bellenoue et al, 2003;Cleary and Farrell, 1995;Enomoto, 2001;Huang et al, 1986), especially at engine conditions (Daniel, 1957). Therefore, for single-wall quenching, the value of quenching distance is typically evaluated from experimentally measured maximum wall heat flux (Huang et al, 1986;Vosen et al, 1984) using a simple relationship relating these two parameters: where d q is the quenching distance, Q w is the maximum wall heat flux, k is the thermal conductivity of gas, and DT is the temperature difference across the quenching layer.…”

Unsteady heat transfer during the turbulent combustion of a lean premixed methane–air flame: Effect of pressure and gas dynamics

“…Indeed, the behaviour of flamewall interaction depends on its geometry: head-on or sidewall. In the laminar case of flame-wall interaction [9], heat flux is higher in head-on quenching than in sidewall quenching. This is related to both quenching distance and flame front stretching, which are smaller in head-on quenching than in sidewall quenching.…”