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- 저자 : 윤상욱(Sangwook Yun) (검색결과 1 건)
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윤상욱(Sangwook Yun),오정석(Jeong seog Oh),김문기(Munki Kim),윤영빈(Youngbin Yoon) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Many previous works have been performed to provide correlations of flame length, theoretically and experimentally. Most of these results studied were conducted in vertical turbulent flame with no coaxial air condition. The present study analyzes the flame length scaling with coaxial air. In turbulent hydrogen non-premixed jet flames with coaxial air, flame length scaling theoretically proposed so far has been related with the concept of a far-field equivalent source. At high coaxial air to fuel velocity ratio, UA/UF, however, this scaling theory has some difference with experimental flame length data. This difference is understood to be due to the fact that the theory is based on far-field notion, while the effect of coaxial air on jet flame occurs in the region near the nozzle exit. Therefore, we define effective jet density Peff involving the concept of near-field so that effective jet diameter can be extended to the near field region. In this condition, we modify the correlation and compare with experimental data.
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