Flow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurements
In this study, we have examined the flow field and the flame surface density in premixed combustion by simultaneous particle image velocimetry (PIV) and OH-planar laser induced fluorescence (OH-PIIF) measurements. Turbulent flames are formed in a cyclone-jet combustor under weak to highly turbulence...
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2018-03-01
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| Series: | Journal of Thermal Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jtst/13/1/13_2018jtst0009/_pdf/-char/en |
| _version_ | 1818313080992432128 |
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| author | Kazuhiro YAMAMOTO Kenta YAMAMORI Yasuo ASADA |
| author_facet | Kazuhiro YAMAMOTO Kenta YAMAMORI Yasuo ASADA |
| author_sort | Kazuhiro YAMAMOTO |
| collection | DOAJ |
| description | In this study, we have examined the flow field and the flame surface density in premixed combustion by simultaneous particle image velocimetry (PIV) and OH-planar laser induced fluorescence (OH-PIIF) measurements. Turbulent flames are formed in a cyclone-jet combustor under weak to highly turbulence. The flame surface density is evaluated by the orthogonal OH-PLIF for vertical and horizontal imaging. In terms of the flame front detected by OH fluorescence, the flow field of turbulent flames including the strain rate has been discussed. It is found that the axial velocity becomes the maximum around the center axis, whereas the rms axial or radial velocity takes its maximum at the position far from the center axis. The larger velocity fluctuation is observed by increasing the mean exit velocity of Um. The radial position of peak OH fluorescence signal is not in the region of large rms velocity, except for the condition where the local extinction is observed. Hence, the large velocity fluctuation induces the local extinction through the high strain rate. The flame surface density is increased with an increase in rms velocity. The range of three-dimensional flame surface density (3D FSD) is from 0.2 to 0.8 mm-1, which corresponds similarly to that of the Bunsen flame. Moreover, based on two-dimensional (2D) and 3D FSDs, the increasing factor of 3D effects is not the same value of homogeneous turbulence. Recognizing a linear relationship between the rms axial velocity and the integrated FSD, the increase of FSD is simply caused by the flame wrinkling due to the turbulence, even at the condition where the local extinction occurs. |
| first_indexed | 2024-12-13T08:28:04Z |
| format | Article |
| id | doaj.art-bdd6366b4ae549ad87ce0b9afb0da423 |
| institution | Directory Open Access Journal |
| issn | 1880-5566 |
| language | English |
| last_indexed | 2024-12-13T08:28:04Z |
| publishDate | 2018-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Thermal Science and Technology |
| spelling | doaj.art-bdd6366b4ae549ad87ce0b9afb0da4232022-12-21T23:53:51ZengThe Japan Society of Mechanical EngineersJournal of Thermal Science and Technology1880-55662018-03-01131JTST0009JTST000910.1299/jtst.2018jtst0009jtstFlow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurementsKazuhiro YAMAMOTO0Kenta YAMAMORI1Yasuo ASADA2Department of Mechanical System Engineering Nagoya UniversityDepartment of Mechanical System Engineering Nagoya UniversityDepartment of Mechanical System Engineering Nagoya UniversityIn this study, we have examined the flow field and the flame surface density in premixed combustion by simultaneous particle image velocimetry (PIV) and OH-planar laser induced fluorescence (OH-PIIF) measurements. Turbulent flames are formed in a cyclone-jet combustor under weak to highly turbulence. The flame surface density is evaluated by the orthogonal OH-PLIF for vertical and horizontal imaging. In terms of the flame front detected by OH fluorescence, the flow field of turbulent flames including the strain rate has been discussed. It is found that the axial velocity becomes the maximum around the center axis, whereas the rms axial or radial velocity takes its maximum at the position far from the center axis. The larger velocity fluctuation is observed by increasing the mean exit velocity of Um. The radial position of peak OH fluorescence signal is not in the region of large rms velocity, except for the condition where the local extinction is observed. Hence, the large velocity fluctuation induces the local extinction through the high strain rate. The flame surface density is increased with an increase in rms velocity. The range of three-dimensional flame surface density (3D FSD) is from 0.2 to 0.8 mm-1, which corresponds similarly to that of the Bunsen flame. Moreover, based on two-dimensional (2D) and 3D FSDs, the increasing factor of 3D effects is not the same value of homogeneous turbulence. Recognizing a linear relationship between the rms axial velocity and the integrated FSD, the increase of FSD is simply caused by the flame wrinkling due to the turbulence, even at the condition where the local extinction occurs.https://www.jstage.jst.go.jp/article/jtst/13/1/13_2018jtst0009/_pdf/-char/enturbulent combustionpremixed combustionoh-plifpivstrain rate |
| spellingShingle | Kazuhiro YAMAMOTO Kenta YAMAMORI Yasuo ASADA Flow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurements Journal of Thermal Science and Technology turbulent combustion premixed combustion oh-plif piv strain rate |
| title | Flow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurements |
| title_full | Flow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurements |
| title_fullStr | Flow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurements |
| title_full_unstemmed | Flow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurements |
| title_short | Flow field and flame surface density of turbulent flames by simultaneous PIV/OH-PLIF measurements |
| title_sort | flow field and flame surface density of turbulent flames by simultaneous piv oh plif measurements |
| topic | turbulent combustion premixed combustion oh-plif piv strain rate |
| url | https://www.jstage.jst.go.jp/article/jtst/13/1/13_2018jtst0009/_pdf/-char/en |
| work_keys_str_mv | AT kazuhiroyamamoto flowfieldandflamesurfacedensityofturbulentflamesbysimultaneouspivohplifmeasurements AT kentayamamori flowfieldandflamesurfacedensityofturbulentflamesbysimultaneouspivohplifmeasurements AT yasuoasada flowfieldandflamesurfacedensityofturbulentflamesbysimultaneouspivohplifmeasurements |