On the Instantaneous Dynamics of the Large- Scale Structures In The Impinging Round Jet J. W. Hall & D. Ewing Department of Mechanical Engineering, McMaster.

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Presentation transcript:

On the Instantaneous Dynamics of the Large- Scale Structures In The Impinging Round Jet J. W. Hall & D. Ewing Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada

Perry Fest 2004 Kingston Turbulent Round Impinging Jet Flow visualization of impinging round jet, H/D=2.0, Re=20000, Popiel and Trass (1991).

Perry Fest 2004 Kingston Turbulent Plane Wall Jet Gogineni and Shih (1997)

Perry Fest 2004 Kingston Harvey and Perry’s Rebounding Vortex Harvey and Perry (1971)

Perry Fest 2004 Kingston Three-Dimensionality of Structures? Tsubokura (2003) Re=2,000 Forced at Strouhal Frequency Fully Developed Pipe Flow H/D = 9 Landreth and Adrian (1991) observed instantaneous flow was not symmetric in PIV measurements

Perry Fest 2004 Kingston Investigation of the Three-Dimensionality of Large-Scale Structures Hall et al (2002)

Perry Fest 2004 Kingston Effect of Nozzle-to-Plate Distance Jet Exiting a Long Pipe Re=23,000

Perry Fest 2004 Kingston Pressure Spectra

Perry Fest 2004 Kingston Azimuthal Spectra

Perry Fest 2004 Kingston Azimuthal Frequency Spectra, H/D=2.0 r/D=1.0 r/D=1.5

Perry Fest 2004 Kingston Two-Point, Two Time Correlations H/D=2.0 H/D=4.0 r 1 /D =1.0

Perry Fest 2004 Kingston Dynamics of the Instantaneous Structures Pressure sampled at 800Hz for 350 blocks of 400 data points  ESP scanner system at Boundary Layer Wind Tunnel, University of Western Ontario  Signals are phase corrected in post-processing Perform Proper Orthogonal Decomposition in Azimuthal Direction  Fourier Modes

Perry Fest 2004 Kingston Pressure Field, H/D=2.0 Mean Pressure Fluctuating Pressure

Perry Fest 2004 Kingston Comparison to microphone data Hall et al. (2003)

Perry Fest 2004 Kingston Pressure Spectra m=0 All modes

Perry Fest 2004 Kingston H/D=2.0 All modes m=0, +/-1 m=0

Perry Fest 2004 Kingston H/D=4.0 m=0, +/-1 All modes m=0 to +/-5

Perry Fest 2004 Kingston Impinging Jet DNS Tsubokura (2003) Re=2, 000 Forced at Strouhal Frequency H/D = 9 Satake and Kunugi (1998) Re=10000 H/D = 6, Confined Inlet Condition Fully Developed Pipe Flow

Perry Fest 2004 Kingston Wavelet Analysis: Instantaneous Pressure r/D=2.0 r/D=1.0 r/D=1.5 H/D=2

Perry Fest 2004 Kingston Wavelet Analysis: Azimuthal Modes All modes m=0 m=1 m=5 H/D =2, r/D =1.5

Perry Fest 2004 Kingston Wavelet Coefficients: Mode 0 r/D=2.0 r/D=1.0 r/D=1.5 H/D=2

Perry Fest 2004 Kingston Wavelet Coefficients: Mode 1 r/D=2.0 r/D=1.0 r/D=1.5 H/D=2

Perry Fest 2004 Kingston Azimuthal Mode 1: Precessing? r/D=1.0 r/D=1.5

Perry Fest 2004 Kingston Wavelet Analysis: Effect of H/D H/D =2, r/D =1.5 All modes m=0 m=1 m=5 H/D =4, r/D =1.5

Perry Fest 2004 Kingston Wavelet Analysis: Effect of H/D r/D =1.0 r/D =1.5 H/D=2.0 H/D=4.0

Perry Fest 2004 Kingston Concluding Remarks Measurements of the instantaneous wall pressure fluctuations were used to examine the development of the large-scale structures in the near field of the radial wall jet. The inclusion of at least azimuthal mode 1 was necessary to reasonable model the dynamics of the flow. Contributions from azimuthal mode 0 and 1 underwent variations in magnitude that persisted over periods corresponding to the passage of several structures. There were extended periods where the slope of the phase of mode 1 was linear suggesting there may be periods of jet precessing of varying duration and direction. Structures contributing to fluctuating wall pressure did not appear to become significantly more intermittent as H/D increased. There was less systematic variation of the phase of mode 1 as H/D increased suggesting less systematic jet precessing.