Presumed PDF modeling of microjet assisted CH 4 –H 2 /air turbulent flames

Chouaieb, Sirine; Kriaa, Wassim; Mhiri, Hatem; Bournot, Philippe

doi:10.1016/j.enconman.2016.05.003

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…The coaxial air microjet with a diameter of 1 mm is added to the Sydney swirl burner along the center of the fuel inlet. The dimensions of air microjet is in conformity with the microjet-assisted Brookes and Moss configuration reported by Chouaieb et al , To give better agreement with the experimental data, fuel and swirl air inlet are shifted upstream 50 mm; such an approach has been applied in previous work, such as Yang et al, Kashir et al, and Yang et al…”

Section: Description Of Flame Configuration and Boundary Conditionssupporting

confidence: 67%

“…Increasing the combustion efficiency and reducing emissions are the goals being pursued by researchers. With the advancement of technology, more and more advanced combustion technologies have been proposed, such as flameless combustion, , low temperature combustion, , hydrogen enriched combustion, , and microjet assisted flames, − etc. Air microjet is defined as air injection from a small diameter nozzle .…”

Section: Introductionmentioning

confidence: 99%

“…The judicious microjet velocity was beneficial to combustion without an emissions penalty. After that, the microjet was introduced to the Brookes and Moss configuration by Chouaieb et al , The numerical results presented that an inner flame was generated because of the microjet. The increase of hydrogen percentage of the CH 4 –H 2 mixture, resulted in mixing enhancement and lower soot emission.…”

Section: Introductionmentioning

confidence: 99%

“…Even though the air microjet-assisted flame has been investigated by experimental , or numerical , methods, its application to the swirl flame is not studied sufficiently. Meanwhile, the high momentum of coaxial air microjet has a damaging effect on the recirculation zone of swirl combustion system.…”

Section: Introductionmentioning

confidence: 99%

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Combustion Characteristics of Bluff-Body Turbulent Swirling Flames with Coaxial Air Microjet

et al. 2017

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The interaction between the coaxial air microjet structure and the swirling flow is investigated numerically based on the nonpremixed bluff-body stabilized swirling SM1 flame. The effects of microjet velocity and swirl number on flame combustion characteristics are analyzed. The modified standard k–ε model and the realizable k–ε model are considered for the turbulent model using FLUENT software. The flamelet model is used with the GRI 2.11 detailed kinetic mechanism. In addition, the discrete ordinate model and the weighted-sum-of-gray-gases model are used together to deal with the radiative heat transfer in the combustion process. Results of the modified standard k–ε model are in better agreement with the experimental data than the realizable k–ε model. Results show that the inner flame generates due to the existence of a microjet configuration. High microjet velocity (such as 50 m/s) can reduce the soot formation and keep the inner flame high temperature region away from the microjet nozzle. The structure of the inner flame depends on the microjet velocity and is independent of the swirl number. Swirl number increases from 0.3 to 0.6, the primary peak temperature is enhanced by 48 K, and the peak soot volume fraction is increased by 49% along the axis centerline.

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Section: Description Of Flame Configuration and Boundary Conditionssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Combustion Characteristics of Bluff-Body Turbulent Swirling Flames with Coaxial Air Microjet

et al. 2017

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“…Chouaieb vd. [3] yaptıkları bir başka çalışmada ise CH4-H2 alevini mikrojet ile desteklemişler ve yanma sonu sıcaklık ve is oluşumlarını sayısal olarak araştırmışlardır. Çalışmanın ilk bölümünde "Eddy Dissipation Concept (Girdap Dağılım Kavramı)" ile "Presumed PDF-Probability Density Function (Farzedilmiş Olasılıklı Yoğunluk Fonksiyonu)" modellerini karşılaştırmışlar ve "Presumed PDF" modelin daha iyi sonuçlar verdiğini tespit etmişlerdir.…”

Section: Gi̇ri̇ş (Introduction)unclassified