The flame behavior, flow patterns, and thermochemical structures of a combusting propane gas jet in crossflow excited acoustically at resonance frequency were studied in a wind tunnel. The jet and crossflow Reynolds numbers were 1530 and 1399, respectively. The jet-to-crossflow momentum flux ratio was 0.192. The flame behavior was found to be closely related to the shear-layer vortical flow structures in the near-tube region. Six characteristic flame modes were observed in the domain of jet pulsation intensity I pul . In flame modes 1 and 2 ( 0 < I pul < 0 . 35 ), the shear-layer vortices were dominant. In flame modes 3–6 ( 0 . 35 < I pul < 2 . 28 ), the flames were dominated by a puffing bent jet. Vortical structures increased in size with increasing I pul . Temperature and combustion product measurements showed significant improvements in mixing and combustion, as well as a reduction of combustion-induced pollutants at the near-tube region of the flame. However, pulsing the jet flame in crossflow at pulsation intensities greater than 0.9 led to a significant increase in the maximum values of carbon monoxide and nitric oxide concentrations at the middle- to far-tube flame regions. Therefore, strongly pulsing a jet flame in crossflow may not necessarily lead to an improved combustion.


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    Title :

    Non-Premixed Burner-Attached Jet Flames in Crossflow Pulsed at Resonance Frequency


    Contributors:

    Published in:

    Publication date :

    2017-03-10


    Size :

    19 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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