Influence of local flame displacement velocity on turbulent burning velocity

Kido, Hiroyuki; Nakahara, Masaru; Nakashima, Kouichi; Hashimoto, Jun

doi:10.1016/s1540-7489(02)80225-5

Cited by 99 publications

(69 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The captured image data were transferred to a computer. The spatial resolution of images results in 0.12 mm/pixel, having higher resolution than in our previous studies (16) (23) , enough to detect the fine configuration of turbulent flames. The experiments are conducted as follows.…”

Section: Apparatus and Proceduresmentioning

confidence: 79%

See 1 more Smart Citation

Effect of Stretch on Local Burning Velocity of Premixed Turbulent Flames

Nakahara

Kido²,

Shirasuna

et al. 2007

JTST

Self Cite

View full text Add to dashboard Cite

The effect of positive stretch on the local flame properties of turbulent propagating flames in the flamelet regime was investigated experimentally for methane-, hydrogen-and propane-air mixtures with lean and rich having nearly the same laminar burning velocity (S L0 =25cm/s). The ratio of the turbulence intensity u' to S L0 was varied as 1.4 and 2. A 2D laser tomography technique was used to obtain the temporal local flame configuration and movement in a constant-volume vessel. Some of the key parameters of turbulent combustion quantitatively measured are the local flame displacement velocity S F , curvature and stretch of turbulent flames. Additionally, the Markstein number Ma was obtained from outwardly propagating spherical laminar flames, in order to examine the effect of positive stretch on burning velocity. It was found that the obtained S F was distributed over a wide range with flame stretch as well as curvature, even for low turbulence (u'/S L0 =1.4). There also existed a good relationship between S F and the turbulent burning velocity. A quantitative relationship between Ma based on laminar flames and the S F for positive stretch and curvature of turbulent flames could be observed only for mixtures with Lewis number Le greater about one.

show abstract

Section: Apparatus and Proceduresmentioning

confidence: 79%

“…Experimental apparatus and procedure are basically the same as that used in our previous studies (16) (23) , except for a camera system. The combustion chamber used is a nearly spherical vessel with an equivalent inner diameter of about 100 mm as shown in Fig.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

Effect of Stretch on Local Burning Velocity of Premixed Turbulent Flames

Nakahara

Kido²,

Shirasuna

et al. 2007

JTST

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, although some attentions have been devoted on the effect of fuel type in combustion instability [16][17][18] and combustion noise [19], no work has been focused on the transmitted noise rising from a burned gases of a traditional or novel composite fuel in an exit combustor nozzle; as the whole above studies applied hot air as the working fluid. These conditions, however, are really found in an exit nozzle of a combustor in industrial or aero-engine gas turbines.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the transmitted noise of a combustor exit nozzle caused by burned hydrogen-hydrocarbon gases

Hosseinalipour

Fattahi

Karimi

2016

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Transmitted noise is a major problem in industrial and aero-engine gas turbines. One of a noise generating part in the preceding systems is exit nozzle which can play as encouraging or discouraging sound waves. The generated noise may arise from an incident acoustic wave or entropy wave. In this paper, the effect of heat transfer and inlet Mach number of the exit nozzle as well as replacing the traditional hydrocarbon fuels with hydrogen and composite of hydrogen-hydrocarbon on noise generation is studied. Further, the influence of the hydrodynamic decaying mechanisms in a nozzle on the noise generated by entropy waves is investigated. It is found that hydrogen can reduce transmitted noise in a subcritical nozzle with an acoustic incident wave or in a supercritical nozzle with an incident entropic wave.

show abstract

“…To confirm the flame stretch concept experimentally, measurements of the flame displacement speed are necessary. In general, shadowgraph or laser tomography has been adopted to estimate flame displacement (18), (30) . However, in these techniques, flame propagation normal to the flame front is assumed.…”

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

DNS and Combined Laser Diagnostics of Turbulent Combustion

Tanahashi

Sato

Shimura

et al. 2008

JTST

View full text Add to dashboard Cite

With the developments of computer technologies, three-dimensional direct numerical simulations (DNS) of turbulent combustion have been realized with a detailed or reduced kinetic mechanism. The 3D DNS gives detailed information about turbulent flames, while there are few experimental techniques which have high accuracy enough to compare with DNS. In this paper, after showing summary of recent DNS of turbulent premixed flames, newly-developed laser diagnostics are presented. Simultaneous CH-OH planar laser induced fluorescence (PLIF) and stereoscopic particle image velocimetry (PIV) are used to investigate the local flame structure of the turbulent premixed flames. From CH-OH PLIF and PIV measurements, flame fronts are identified, and the curvature of the flame front and the tangential strain rate at the flame front are evaluated. The experimental results are compared with 3D DNS of hydrogen-air and methane-air turbulent premixed flames. The flame displacement speeds in turbulent premixed flames have been measured directly by the CH double-pulsed PLIF. Since the time interval of the successive CH PLIF can be selected arbitrarily, both of the large scale dynamics and local displacement of the flame front can be obtained. As an application of laser diagnostics for development of high-efficient and low-emission combustors, reconstruction of 3D flame structure is shown by using multiple-plane OH PLIF.

show abstract

Influence of local flame displacement velocity on turbulent burning velocity

Cited by 99 publications

References 13 publications

Effect of Stretch on Local Burning Velocity of Premixed Turbulent Flames

Effect of Stretch on Local Burning Velocity of Premixed Turbulent Flames

Investigation of the transmitted noise of a combustor exit nozzle caused by burned hydrogen-hydrocarbon gases

DNS and Combined Laser Diagnostics of Turbulent Combustion

Contact Info

Product

Resources

About