TY - GEN
T1 - Velocity measurements in jets with application to noise source modeling
AU - Morris, Philip J.
AU - Zaman, Khairul B.M.Q.
N1 - Funding Information:
These experiments were conducted while P.J. Morris was on sabbatical leave at the NASA Glenn Research Center. He appreciates the hospitality shown to him by the Aeropropulsion Division, particularly the Acoustics and Inlet & Nozzle Branches. The Wind-US simulations were performed by Mr. Steven Miller of the Department of Aerospace Engineering at Penn State University. This research was sponsored under a NASA Cooperative Agreement NNX07AC88A entitled, A Comprehensive Model for the Prediction of Supersonic Jet Noise. The Technical Monitor is Dr. Milo Dahl.
PY - 2009
Y1 - 2009
N2 - This paper describes an experimental investigation of the statistical properties of turbulent velocity fluctuations in an axisymmetric jet. The focus is on those properties that are relevant to the prediction of noise. Measurements are performed using two single hotwire anemometers as well as a two-component anemometer. Two-point cross correlations of the axial velocity fluctuations and the fluctuation in the square of the axial velocity fluctuations are presented. Several reference locations in the jet are used including points on the jet lip and centerlines. The scales of the turbulence and the convection velocity are determined, both in an overall sense as well as a function of frequency. The relationship between the second and fourth order correlations is developed and compared with the experimental data. The implications of the use of dimensional as well as non-dimensional correlations are considered. Finally, a comparison is made between the length scales deduced from the flow measurements and a RANS CFD calculation.
AB - This paper describes an experimental investigation of the statistical properties of turbulent velocity fluctuations in an axisymmetric jet. The focus is on those properties that are relevant to the prediction of noise. Measurements are performed using two single hotwire anemometers as well as a two-component anemometer. Two-point cross correlations of the axial velocity fluctuations and the fluctuation in the square of the axial velocity fluctuations are presented. Several reference locations in the jet are used including points on the jet lip and centerlines. The scales of the turbulence and the convection velocity are determined, both in an overall sense as well as a function of frequency. The relationship between the second and fourth order correlations is developed and compared with the experimental data. The implications of the use of dimensional as well as non-dimensional correlations are considered. Finally, a comparison is made between the length scales deduced from the flow measurements and a RANS CFD calculation.
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M3 - Conference contribution
AN - SCOPUS:78549281431
SN - 9781563479694
T3 - 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
BT - 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
T2 - 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
Y2 - 5 January 2009 through 8 January 2009
ER -