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- Chen, YuqianLund University,Lunds universitet,Strömningsteknik,Institutionen för energivetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Fluid Mechanics,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH,Nanjing University (författare)
Investigation of flame characteristics and cooling effectiveness of jet-cooled wall flameholders in vitiated flow
- Artikel/kapitelEngelska2022
Förlag, utgivningsår, omfång ...
- Elsevier BV,2022
Nummerbeteckningar
- LIBRIS-ID:oai:lup.lub.lu.se:de94bbdb-2b03-4b38-9286-a6f82d1bbfa8
- https://lup.lub.lu.se/record/de94bbdb-2b03-4b38-9286-a6f82d1bbfa8URI
- https://doi.org/10.1016/j.ast.2022.107710DOI
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- Språk:engelska
- Sammanfattning på:engelska
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- Experimental and numerical studies were performed to understand the flame characteristics and cooling effect of jet-cooled wall flameholders in a simplified augmented combustor. The time-averaged flame structure and wall temperature were investigated employing an instantaneous flame capturing system with image processing technology and a wall temperature measurement system, respectively. Flow and fuel distribution simulations were carried out to analyze the flame structure and cooling effect of the jet-cooled flameholders in high-temperature and high-velocity vitiated flows. It was found that the jet cooling type and the cooling jet angle on the oblique plate α and on the rear plate β greatly affect the flame features and cooling effect of the flameholder. The external-inhaled air cooling schemes can increase the flame luminosity and temperature and create a flame hollowed-out zone in the near-wall region to reduce flame radiation and heat convection, thereby achieving an excellent cooling effect. The pressure-driven gas jet cooling schemes yielded a weaker flame luminosity and its flame structure in the cavity more sensitive to the cooling jet angle than external-inhaled air cooling schemes. Moreover, the external-inhaled air cooling schemes have significantly better cooling effects than the pressure-driven gas jet cooling schemes under different mainstream conditions and fuel flow rates. Notably, the cooling schemes with α=30∘ and β=30∘ have more uniform wall temperature than that of α=90∘ and β=150∘ on the above two plates. Furthermore, the external-inhaled air cooling scheme with α=90∘ and β=150∘ has the best cooling performance under different mainstream and cooling air conditions and presents great cooling effectiveness in the case of enhancing cooling air temperature.
Ämnesord och genrebeteckningar
- TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
- Cooling effectiveness
- Flame characteristics
- Fuel distribution
- Jet cooling
- Wall flameholder
- Wall temperature
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Fan, YuxinNanjing University (författare)
- Han, QixiangNanjing University (författare)
- Bai, Xue SongLund University,Lunds universitet,Strömningsteknik,Institutionen för energivetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,LTH profilområde: Energiomställningen,LTH profilområden,Fluid Mechanics,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: The Energy Transition,LTH Profile areas,Faculty of Engineering, LTH,Nanjing University(Swepub:lu)vok-xba (författare)
- StrömningsteknikInstitutionen för energivetenskaper (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Aerospace Science and Technology: Elsevier BV1271270-9638
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- Aerospace Science and Technology (Sök värdpublikationen i LIBRIS)
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- Chen, Yuqian
- Fan, Yuxin
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- Bai, Xue Song
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