Abstract
A new technique was developed for the simultaneous measurement of velocity and pressure in turbulent flows. To accomplish this objective, a new probe (hereafter called the combined probe) that consists of an X-type hot-wire probe and a newly devised pressure probe was developed. The pressure probe was miniaturized by the MEMS fabrication process and by using a 0.1-in. microphone as a pressure sensor for improving the spatial resolution. This pressure probe was placed between two hot-wire sensors of which the X-type hot-wire probe was composed. The pressure probe was given a hemispherical tip, like that of a pitot tube, because an earlier pressure probe with a conical tip suffered from a reduction in spatial resolution. The spatial arrangement of the pressure probe and the hot-wire probe for the combined probe was carefully determined, because there was a risk that the measurement accuracy of one probe will be influenced by disturbances caused by the other probe when the two probes were placed very close to each other. Therefore, the combined probe was arranged to engender no noticeable interference between the velocity data and the pressure data measured by their respective probes. As one application of this combined probe, simultaneous measurements of pressure and two components of instantaneous velocity were performed in a plane jet. The turbulent energy budget and the cross-correlation coefficient of velocity and pressure in the intermittent region of the plane jet were estimated. The results show that the mean streamwise velocity, velocity fluctuation, and pressure fluctuation profiles were consistent with those measured individually using the X-type hot-wire probe or pressure probe. Moreover, it was shown that the integral value of the diffusion term (which should theoretically be equal to zero) in the turbulent energy transport equation was closer to zero than previous reports (Bradbury in J Fluid Mech 23(Part 1):31–64, 1965). In addition, the time variation of the cross-correlation coefficient in the intermittent region supports the vortex structure model predicted in previous studies (Browne et al. in J Fluid Mech 149:355–373, 1984; Tanaka et al. JSME Int J Ser B 49(4):899–905, 2006; Sakai et al. J Fluid Sci Technol 2(3):611–622, 2007).
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References
Bradbury LJS (1965) The structure of a self-preserving turbulent plane jet. J Fluid Mech 23(Part 1):31–64
Browne LWB, Antonia RA, Chambers AJ (1984) The interaction region of a turbulent plane jet. J Fluid Mech 149:355–373
Elliott JA (1972) Microscale pressure fluctuations measured within the lower atmospheric boundary layer. J Fluid Mech 53(Part 2):351–383
Fuchs HV (1972) Measurement of pressure fluctuations within subsonic turbulent jets. J Sound Vib 22(3):361–378
George WK, Beuther PD, Arndt REA (1984) Pressure spectra in turbulent free shear flows. J Fluid Mech 148:155–192
Hedley TB, Keffer JF (1974) Turbulent/non-turbulent decisions in an intermittent flow. J Fluid Mech 64(Part 4):625–644
Heskestad G (1965) Hot-wire measurements in a plane turbulent jet. Trans ASME Ser E (J Appl Mech) 32(4):721–734
Jones BG, Adrian RJ, Nithianandan CK (1979) Spectra of turbulent static pressure fluctuations in jet mixing layers. AIAA J 17(5):449–457
Kobashi Y (1957) Measurements of pressure fluctuation in the wake of cylinder. J Phys Soci Jpn 12(5):533–543
Kobashi Y, Kono N, Nishi T (1960) Improvement of a pressure pickup for the measurements of turbulence characteristics. J Aero Space Sci 27:149–151
Kupferschmied P, Köppel P, Roduner C, Gyarmathy G (2000) On the development and application of the fast-response aerodynamic probe system in turbomachines-part 1: the measurement system. J Turbomach 122:505–516
Liu X, Katz J (2006) Instantaneous pressure and material acceleration measurement using a four-exposure PIV system. Exp Fluids 41:227–240
Naka Y, Omori T, Obi S, Masuda S (2006) Simultaneous measurements of fluctuating velocity and pressure in a turbulent mixing layer. Int J Heat Fluid Flow 27:737–746
Naka Y, Azegami S, Kawata T, Fukagata K, Obi S (2009) Simultaneous measurement of velocity and pressure in a wing-tip vortex. J Fluid Sci Technol 4(1):107–115
Pope SB (2000) Turbulent flows. Cambridge University Press, United Kingdom, pp 264–332 (pp 387–462)
Ribner HS (1962) Aerodynamic sound from fluid dilatation. Institute of Aerophysics Report, University of Toronto, No. 86
Ribner HS (1985) Perspectives on jet noise. AIAA J 19(12):1513–1526
Sakai Y, Tanaka N, Yamamoto M, Kushida T (2006) On the development of coherent structure in a plane jet (Part 1, Characteristics of Two-Point Velocity Correlation and Analysis of Eigenmodes by the KL Expansion). JSME Int J Ser B 49(1):115–124
Sakai Y, Moriguchi Y, Tanaka N, Yamamoto M, Kubo T, Nagata K (2007) On characteristics of velocity and pressure field in two-dimensional turbulent jet. J Fluid Sci Technol 2(3):611–622
Sakai Y, Kato T, Moriguchi Y, Sakai M, Ito K, Mitsuishi Y, Nagata K, Kubo T (2008) On static pressure fluctuation between sirocco fan blades in a car air-conditioning system. J Fluid Sci Technol 3(6):796–804
Sakai Y, Nagata K, Moriguchi Y, Kubo T (2010) Study on the structure of turbulent plane jet by the simultaneous measurement of instantaneous two velocity components and static pressure. In Proceedings of the international conference on jets, wakes and separated flows, ICJWSF-2010. CD-ROM
Tanaka N, Sakai Y, Yamamoto M, Kubo T (2006) On the development of coherent structure in a plane jet (Part 4, The Multipoint Simultaneous Measurement of Two-Component Velocities and the Simple Coherent Structure Model). JSME Int J Ser B 49(4):899–905
Toyoda K, Okamoto T, Shirahama Y (1994) Eduction of vortical structures by pressure measurements in noncircular jets. Appl Sci Res 53:237–248
Townsend AA (1949) The fully developed turbulent wake of a circular cylinder. Aust J Sci Res Ser A Phys Sci 2:451–468
Tsuji Y, Fransson JHM, Alfredsson PH, Johansson AV (2007) Pressure statistics and their scaling in high-Reynolds-number turbulent boundary layers. J Fluid Mech 585:1–40
Acknowledgments
The authors express their gratitude for partial financial support of this study by the Ono Acoustic Research Fund and the Grant-in-Aids for scientific research (No. 3760155). The authors also express their gratitude to Prof. Takashi Kubo, Mr. Yuichi Shouji, and Mr. Kazuhiro Onishi for support in performing the experiment in this study.
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Terashima, O., Sakai, Y. & Nagata, K. Simultaneous measurement of velocity and pressure in a plane jet. Exp Fluids 53, 1149–1164 (2012). https://doi.org/10.1007/s00348-012-1351-z
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DOI: https://doi.org/10.1007/s00348-012-1351-z