Eduction of vortical structures by pressure measurements in noncircular jets

Toyoda, Kuniaki; Okamoto, Tatuyuki; Shirahama, Yoshikuni

doi:10.1007/bf00849102

Cited by 20 publications

(10 citation statements)

References 9 publications

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“…The pioneering works on coherent structures in turbulent flow were first confirmed by Crow and Champagne [1] and Brown and Roshko [2]. A lot of researches have been carried out concerning the mechanism and role of coherent structures in jet flows [3][4][5][6][7][8][9]. Previous experimental observations by Sato [10] revealed that the jet had sensitivity to external sound, and different initial modes of evolution could lead to distinct growth rates of mixing layers.…”

Section: Introductionmentioning

confidence: 99%

Jet Flapping Control with Acoustic Excitation

Iio¹,

Hirashita²,

Katayama³

et al. 2013

JFCMV

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The dynamics of flapping motion of a rectangular jet under acoustic excitation is studied experimentally by means of hot-wire measurement and flow visualization with smoke method. The excitation sufficiently enables "phase-lock", which permitted us to extract the organized wave motion from a background field of finite turbulent fluctuations. The mean and fluctuation velocity are investigated and focused on the excitation frequency and the Reynolds number. As the excitation frequency decreases, it was found that the jet flapping and the jet spread were enhanced. The excitation with sub-harmonic frequency has significant effects on the rectangular jet behavior. The maximum value of the periodic velocity fluctuation strongly depends on the excitation frequency.

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Section: Introductionmentioning

confidence: 99%

Jet Flapping Control with Acoustic Excitation

Iio¹,

Hirashita²,

Katayama³

et al. 2013

JFCMV

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“…Recently, applications of a miniature Pitot tube originally developed by Toyoda et al [3] to measurements of the pressure fluctuation were reported [4,5]. Naka et al [6] combined an X-type hot-wire probe and the miniature Pitot tube and performed simultaneous measurements of velocity and the fluctuating static pressure in a turbulent mixing layer, and the measured velocity-pressure correlation distribution showed good agreement with DNS data.…”

Section: Introductionmentioning

confidence: 90%

“…As for the pressure signal, the frequency response of the TP-probe was compensated by Eqs. (2) and (3). In addition, the background noise of the free stream was reduced by the optimal filtering scheme proposed by Naguib et al [11].…”

Section: Data Processingmentioning

confidence: 99%

Simultaneous measurement of three velocity compo-nents and fluctuating pressure in a turbulent wing-tip vortex

Kawata

Naka

Fukagata

et al. 2009

Proceedings of the Sixth International Symposium on Turbulence, Heat and Mass Transfer

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An attempt is made for simultaneous measurements of velocity and pressure in threedimensional turbulent flows by means of a miniature pressure probe combined with a triple hot-film anemometer. A turbulent wing-tip vortex is chosen for the test case because of the strong fluctuation of velocity and pressure near its core region. Measurements are undertaken in the near field. The static pressure fluctuation and the velocity-pressure correlation are experimentally investigated. Although they showed distribution that is consistent with those in previous reports, the influence of probe interference needs be substantially reduced.

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“…There were four types of the SP-probe: the probe-air, d10, d15 and d20. The probe-air had similar geometric configuration to those employed in previous experiments in the air (Toyoda et al, 1994;Naka et al, 2006). It consisted of a thin tube with a circular corn tip, and the outer and inner diameters were 1.0 and 0.8 mm, respectively.…”

Section: Pressure-measuring System 311 Static-pressure Probementioning

confidence: 99%

“…These problems in experiment in air were addressed by Shirahama and Toyoda (1993) and Toyoda et al (1994), who optimized geometric configuration of a miniature static-pressure probe (SP-probe) so that the disturbance to the flow and the cross-flow error were minimized. They also proposed some techniques to calibrate the frequency response of the pressure-measuring system.…”

Section: Introductionmentioning

confidence: 99%

An attempt to measure fluctuating local pressure in free turbulent flow in water

Kawata

Maeda

Obi

2014

JFST

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We developed a technique for the measurement of fluctuating hydraulic-pressure at an arbitrary point in turbulent flow. A pressure-measuring system was composed of a miniature static-pressure probe (SP-probe), a strain-gagetype pressure transducer, and a tube connecting them. A model equation of dynamic response of the pressuremeasuring system was introduced, and a calibration technique for determining parameters in the model equation was developed. Effects of the size of the SP-probe, length of the tube, and sensitivity of the pressure sensor were systematically investigated using several SP-probes, tubes, and pressure transducers with different sizes, lengths, and sensitivities, and fluctuating hydraulic-pressure measurement was performed in a wake of a circular cylinder.In the past hydraulic wall-pressure measurement, a strain-gage-type pressure transducer was used as a pressure sensor and connected to the pressure tap on the wall by tubing. Dynamic response of such a pressure-measuring system has been investigated in the previous studies (e.g., Geddes et al., 1984), and it was pointed out that the dynamic response was non flat mainly due to elasticity of the pressure sensor while effect of compressibility of the fluid is negligible. The methods to correct these effects have been studied in literatures (Donovan et al., 1991;Taylor and Donovan, 1992;Donovan et al., 1994;Aydin, 1998). In these studies, the behavior of the pressure-measuring system was modeled as that of a harmonic oscillator with one degree of freedom, and parameters in the model equation, the natural frequency and the damping factor, were determined by calibration.

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Eduction of vortical structures by pressure measurements in noncircular jets

Cited by 20 publications

References 9 publications

Jet Flapping Control with Acoustic Excitation

Jet Flapping Control with Acoustic Excitation

Simultaneous measurement of three velocity compo-nents and fluctuating pressure in a turbulent wing-tip vortex

An attempt to measure fluctuating local pressure in free turbulent flow in water

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