Thermal-ignition analysis in wall-bounded boundary-layer flows with an unheated starting length

Shangpeng Li, Qiang Yao, Chung K. Law

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The thermal ignition of a reacting boundary-layer flow over the hot surface of a wedge/cone with an unheated starting length, L, is studied analytically and numerically. For the realistic situation of large activation energy reactions, a locally similar solution is derived and is found to agree well with the numerical solution within a wide range of L, geometric angle and the Prandtl number, Pr. An increase in L is shown to reduce the minimum ignition distance, because the flow velocity is reduced by the viscous drag over the starting length so that the flow over the heated section is heated to a greater extent for the same distance.

Original languageEnglish (US)
Pages (from-to)1722-1737
Number of pages16
JournalCombustion science and technology
Issue number10
StatePublished - Oct 3 2018

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • General Physics and Astronomy


  • Local similarity
  • Thermal ignition
  • Unheated starting length


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