Recovery temperature measurement of underexpanded sonic jets impinging on a flat plate

Byung Gi Kim, Man Sun Yu, Hyung Hee Cho

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


An experimental investigation has been carried out to examine heat-transfer characteristics of an axisymmetric, underexpanded, sonic jet impinging on a flat plate. The ratio of nozzle-exit pressure to the ambient pressure, that is, underexpansion ratio ranges from 1.5 to 3.5, and the distance from the nozzle exit to the plate is adjusted from 0.5 to 20.0 nozzle-exit diameters. Detailed measurements of the recovery factor and the surface pressure on the flat plate have been achieved. The results showed that the recovery factor obtained in the present study have distributions that are different from those for low-velocity jets. It has been found that the recovery factor at the stagnation point varies from 0.35 up to over 1.25 for the highest underexpansion ratio of Pe/Pa = 3.5 within the present experimental range.

Original languageEnglish
Pages (from-to)313-319
Number of pages7
JournalJournal of Thermophysics and Heat Transfer
Issue number3
Publication statusPublished - 2003

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Space and Planetary Science


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