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Journal Articles
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( a ) Photograph of the MICCA-Spray setup. The height of the combustion cha...
Published Online: September 23, 2022
Fig. 1 ( a ) Photograph of the MICCA-Spray setup. The height of the combustion chamber is maintained at 400 mm for both the inner and the outer chamber walls. ( b ) Schematic top view of the combustion chamber showing the locations of chamber microphones (MCx) and photomultipliers (PMx). The azimu... More
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Amplitude (left) and frequency (right) stability map of MICCA-Spray for the...
Published Online: September 23, 2022
Fig. 2 Amplitude (left) and frequency (right) stability map of MICCA-Spray for the different swirlers in higher-swirl category. The swirlers in the lower-swirl category (707 and 712) are always stable in the assessed operating zone and hence are not shown here. The black star on the stability map ... More
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Time evolution of chamber pressure     p    ′    c       (MC1 to MC4) and s...
Published Online: September 23, 2022
Fig. 3 Time evolution of chamber pressure p ′ c (MC1 to MC4) and spin ratio s r for the swirlers 716, the alternate arrangement of 716-816, 726, and 727. Two operating points are chosen from the instability map where strong instability is exhibited by the four swirler configurat... More
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Histogram of spin ratio occurrence comparing a configuration where all the ...
Published Online: September 23, 2022
Fig. 4 Histogram of spin ratio occurrence comparing a configuration where all the swirlers impact CR and a configuration where clockwise and CCR swirlers are alternatively placed. The vertical line corresponds to the mean spin ratio s r ¯ . The results are presented at four ther... More
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Flame images showing OH* chemiluminescence captured in SICCA-Spray under st...
Published Online: September 23, 2022
Fig. 5 Flame images showing OH* chemiluminescence captured in SICCA-Spray under stable conditions. An Abel inversion is applied to the averaged images captured by the camera and are displayed in false colors. P sicca = 6.4   kW and ϕ = 0.85 . The swirlers 707 and 712 belo... More
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Flame describing function represented in terms of gain  G  and phase    φ  ...
Published Online: September 23, 2022
Fig. 6 Flame describing function represented in terms of gain G and phase φ at different levels of relative velocity fluctuation u ′ / u ¯ and shown for the five swirlers considered. The gray bands in the phase diagrams indicate the tentative unstable bands. It is recalled he... More
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Flame describing function phase    φ    for the different swirlers consider...
Published Online: September 23, 2022
Fig. 7 Flame describing function phase φ for the different swirlers considered in this study. Only the phase evolution of Fig. 6 corresponding to the maximum attainable relative velocity fluctuations are shown. The swirlers 707 and 712 belong to the lower-swirl category while the swirlers ... More
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Flame describing function phase    φ    for swirlers 707 and 716 at     ϕ  ...
Published Online: September 23, 2022
Fig. 8 Flame describing function phase φ for swirlers 707 and 716 at ϕ = 0.95 and P sicca = 6.4   kW in SICCA-Spray. Only the phase evolution with the maximum attainable relative velocity fluctuations at all frequencies are shown. (Color version online.) More
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