Study of the fluid mechanics of transitional steady and pulsed impinging jets using a high-speed PIV system

H. Medina, E. Benard, J. C. Huang, S. Raghunathan

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

2 Citations (Scopus)

Abstract

An experimental investigation was carried out in order to study the fluid mechanics of pulsating transitional jets. The distance between the nozzle exit and the impinging plate was kept constant an equal to H=d = 3. The Reynolds number was also kept constant at approximately Re = 4200. Three pulsating frequencies were examined St ≈ 0:1; 0:25 and 0:5. In addition, a steady impinging jet was also studied in order to provide a base flow for comparison. It was found that the presence of a pulsation significantly affects the flow field of impinging jets, in particular, the distribution of the Reynolds stresses (u′ ,v′), especially, for the jet pulsed at the highest frequency (St = 0:5), which exhibits a distribution of the Reynolds stresses similar to that of steady jets at much higher Reynolds numbers. It was also found that the presence of a pulsation widens the jet and leads to larger values of the radial velocity component near the impinging wall as the Strouhal number is increased.

Original languageEnglish
Title of host publication46th AIAA Aerospace Sciences Meeting and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics
Pages1-19
Number of pages20
ISBN (Print)9781563479373
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event46th AIAA Aerospace Sciences Meeting and Exhibit, AIAA-2008-766 - Reno, United States
Duration: 7 Jan 200810 Jan 2008

Conference

Conference46th AIAA Aerospace Sciences Meeting and Exhibit, AIAA-2008-766
CountryUnited States
CityReno
Period7/01/0810/01/08

Keywords

  • Baseflows
  • Experimental investigations
  • High-speed
  • Impinging jet
  • Nozzle exits
  • Pulsating frequencies
  • Radial velocity
  • Reynolds stress
  • Steady jet

ASJC Scopus subject areas

  • Aerospace Engineering

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  • Cite this

    Medina, H., Benard, E., Huang, J. C., & Raghunathan, S. (2008). Study of the fluid mechanics of transitional steady and pulsed impinging jets using a high-speed PIV system. In 46th AIAA Aerospace Sciences Meeting and Exhibit (pp. 1-19). [2008-0766] American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2008-766