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

doi:10.2514/6.2008-766

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 proceeding › Conference proceeding › peer-review

6 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 language	English
Title of host publication	46th AIAA Aerospace Sciences Meeting and Exhibit
Publisher	American Institute of Aeronautics and Astronautics
Pages	1-19
Number of pages	20
ISBN (Print)	9781563479373
DOIs	https://doi.org/10.2514/6.2008-766
Publication status	Published - 2008
Externally published	Yes
Event	46th AIAA Aerospace Sciences Meeting and Exhibit, AIAA-2008-766 - Reno, United States Duration: 7 Jan 2008 → 10 Jan 2008

Conference

Conference	46th AIAA Aerospace Sciences Meeting and Exhibit, AIAA-2008-766
Country/Territory	United States
City	Reno
Period	7/01/08 → 10/01/08

Keywords

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

ASJC Scopus subject areas

Aerospace Engineering

Access to Document

10.2514/6.2008-766

http://www.aerofluids.org/publications/conferences/HMEDINA_2008_studyOfTheFlidMechanicsOfTransitionalSteadyAndPulsedImpingingJetsUsingPIV.pdf

Cite this

Study of the fluid mechanics of transitional steady and pulsed impinging jets using a high-speed PIV system. / Medina, H.; Benard, E.; Huang, J. C. et al.
46th AIAA Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 2008. p. 1-19 2008-0766.

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding › peer-review

Medina, H, Benard, E, Huang, JC & 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., 2008-0766, American Institute of Aeronautics and Astronautics, pp. 1-19, 46th AIAA Aerospace Sciences Meeting and Exhibit, AIAA-2008-766, Reno, Nevada, United States, 7/01/08. https://doi.org/10.2514/6.2008-766

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

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.",

keywords = "Baseflows, Experimental investigations, High-speed, Impinging jet, Nozzle exits, Pulsating frequencies, Radial velocity, Reynolds stress, Steady jet",

author = "H. Medina and E. Benard and Huang, {J. C.} and S. Raghunathan",

year = "2008",

doi = "10.2514/6.2008-766",

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isbn = "9781563479373",

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AU - Medina, H.

AU - Benard, E.

AU - Huang, J. C.

AU - Raghunathan, S.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - Baseflows

KW - Experimental investigations

KW - High-speed

KW - Impinging jet

KW - Nozzle exits

KW - Pulsating frequencies

KW - Radial velocity

KW - Reynolds stress

KW - Steady jet

U2 - 10.2514/6.2008-766

DO - 10.2514/6.2008-766

M3 - Conference proceeding

AN - SCOPUS:78149451827

SN - 9781563479373

SP - 1

EP - 19

BT - 46th AIAA Aerospace Sciences Meeting and Exhibit

PB - American Institute of Aeronautics and Astronautics

T2 - 46th AIAA Aerospace Sciences Meeting and Exhibit, AIAA-2008-766

Y2 - 7 January 2008 through 10 January 2008

ER -

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

Abstract

Conference

Keywords

ASJC Scopus subject areas

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