Burning velocity and OH concentration in premixed combustion

Yamamoto, Kazuhiro; Ozeki, Masaki; Hayashi, Naoki; Yamashita, Hiroshi

doi:10.1016/j.proci.2008.06.077

Cited by 60 publications

(19 citation statements)

References 34 publications

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“…Yamamoto et al [42] even found a strong positive correlation between OH radical concentration and laminar flame speed. Results shown in Fig.…”

Section: Effects Of Co and H 2 On The In-cylinder Combustion Charactementioning

confidence: 95%

“…During the oxidization process of hydrocarbon fuels, some elementary reactions and free radicals such as H, O, OH play significant roles due to their extremely high reactivity [41][42][43]. Yamamoto et al [42] even found a strong positive correlation between OH radical concentration and laminar flame speed.…”

Section: Effects Of Co and H 2 On The In-cylinder Combustion Charactementioning

confidence: 99%

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Effects of H2 and CO enrichment on the combustion, emission and performance characteristics of spark ignition natural gas engine

Gao

Zhu

et al. 2016

Fuel

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h i g h l i g h t sCO is less effective than H 2 in improving engine combustion and thermal efficiency. Both CO and H 2 smoothes engine operation and lowers THC emission. CO is less effective in improving the laminar flame speed of CH 4 than H 2 . a b s t r a c tFuel reforming is an attractive way for improving the performances of internal combustion engine. The primary components of the reformed gas are H 2 , CO, CO 2 and N 2 . A detailed knowledge of each component in reformed gas is essential for judging or making better use of the reformed gas as well as reforming technologies. In this paper, the influences of the major combustibles of the reformed gas, H 2 and CO, on the performances of a lean burn spark ignition natural gas engine are investigated. Results indicate that addition of H 2 and CO could improve in-cylinder combustion, smooth engine operation and increase engine thermal efficiency. With the addition of H 2 and CO, both the peaks of in-cylinder pressure and heat release rate increase, flame development duration and rapid combustion duration as well as CovIMEP decrease. However, CO is less effective compared with H 2 . The influence of H 2 on engine THC emission is insignificant while addition of CO tends to increase engine CO emission remarkably owing to the quenching and crevice effect. Both H 2 and CO tend to worsen engine NO x emission due to the increased in-cylinder temperature while the effect of H 2 is more distinct. The simulation of laminar flame speed manifests that addition of H 2 and CO increase O, H and OH radical concentration and hence improve the flame propagation and the combustion process, resulting in improved laminar flame speed of the fuel-air mixtures. In compare, H 2 addition leads to higher laminar flame speed than CO addition does. The whole investigation of this paper implies that both H 2 and CO in the reformed gas are effective in improving engine combustion and effective thermal efficiency while H 2 is more effective.

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“…Yamamoto et al [42] even found a strong positive correlation between OH radical concentration and laminar flame speed. Results shown in Fig.…”

Section: Effects Of Co and H 2 On The In-cylinder Combustion Charactementioning

confidence: 95%

Section: Effects Of Co and H 2 On The In-cylinder Combustion Charactementioning

confidence: 99%

Effects of H2 and CO enrichment on the combustion, emission and performance characteristics of spark ignition natural gas engine

Gao

Zhu

et al. 2016

Fuel

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“…In a numerical study on a hydrogen fueled porous burner, Roohi et al [40] noted that considering the curvilinear shape of flames, the flame velocity can be calculated by averaging over the flame front length. Yamamoto et al [41] reported that a linear relationship is observed between the peak OH and S L , and the peak OH concentration can be a good measure of the burning velocity. As such, in the present study, OH concentration, a commonly-used important indicator of the flame front, is chosen and the way to quantify the flame speed is described as follows: (1) for each y position (denoted as y i ), identify the corresponding x position (denoted as x f,i ) where the OH concentration gets the highest value; (2) for each x f,i , acquire the streamwise velocity (denoted as u g,i ) at that particular position; (3) connect the points denoted by (x f,i , y i ) to form the flame front; and (4) average u g,i to obtain the mean velocity which is defined as the flame speed (designated as S L ).…”

Section: Flame Speedmentioning

confidence: 99%

Fundamental flame characteristics of premixed H2–air combustion in a planar porous micro-combustor

Wang

et al. 2016

Chemical Engineering Journal

124

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“…An experimental setup is shown in Figure 2, which is similar to our previous OH-PLIF measurements [13,14]. A pulsed laser was used to form a thin laser sheet for 2D imaging.…”

Section: Measurement Systemmentioning

confidence: 99%

Reductions of PAH and Soot by Center Air Injection

Yamamoto

Takemoto

2014

Environments

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Abstract:In this study, to reduce the amount of pollutant PAH and soot in the flame, we examined the burner system equipped with a center air injection. For this purpose, by using PAH-LIF and soot LII, we evaluated relative PAH and soot amounts in both the triple port burner and the conventional co-axial burner (double port burner) to discuss effects of center air injection on the formation of PAH and soot. The fuel was propane. In the triple port burner, two different blue flames are observed near the burner rim, followed by bright luminous flames with soot. The flame length is longer when the fuel flow velocity is increased. On the other hand, the flame length is shorter with an increase in internal air flow velocity. As for PAH and soot, these amounts of the triple port burner are much smaller than those of the double port burner. For the triple port burner, due to the center air injection, the fuel consumption occurs in both inner and outer flames. On the other hand, for the double port burner, the oxygen is supplied from one side air, and as a result, the fuel consumption rate is relatively lower. Hence, by the center air injection, the fuel consumption is largely accelerated, resulting in the reduction of PAH and soot.

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Burning velocity and OH concentration in premixed combustion

Cited by 60 publications

References 34 publications

Effects of H2 and CO enrichment on the combustion, emission and performance characteristics of spark ignition natural gas engine

Effects of H2 and CO enrichment on the combustion, emission and performance characteristics of spark ignition natural gas engine

Fundamental flame characteristics of premixed H2–air combustion in a planar porous micro-combustor

Reductions of PAH and Soot by Center Air Injection

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