Nonpremixed flame control with microjets

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

“…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 .…”

“…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.…”

“…Air microjet is defined as air injection from a small diameter nozzle. 10 The microjet structure was first tested by Ganguly et al 7 and Sinha et al 8 in coaxial nonpremixed flames. The experimental results of Ganguly et al 7 found that the increase of microjet velocity could shorten the flame length and reduce the flame fluctuations due to buoyancy.…”

Instability and electrical response of small laminar coflow diffusion flames under AC electric fields: Toroidal vortex formation and oscillating and spinning flames

“…Therefore the capability to modulate these instabilities in combustor designs is desirable. Various forcing methods have been tested for their ability to control flame instability: typical actuators include acoustic drivers to produce pressure waves [6][7][8] , servo valves to adjust flow rates [9] and micro jets to modify flow distributions [10] . These actuators share the challenges of power consumption and time delay between the actions of actuators and associated flame responses.…”

Türbülanslı Metan Alevinde Mikrojet Destekli Seyreltici Kullaniminin NOX Emisyonlarına Olan Etkisinin Sayısal Olarak İncelenmesi

“…Bu bölümden elde edilen sonuçlara göre de H2 ilavesinin reaksiyonu hızlandırdığı bunun da bir sonucu olarak is oluşumunu azalttığı yönündedir. Ganguly ve Puri [4] yaptıkları bir çalışma ile mikrojet desteğinin alev üzerindeki etkilerini araştırmışlardır.…”