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SUMMARY:Measurement &amp\; Modelling of Turbulent Length Scales in Jet Flo
 ws - John Fitzpatrick\, Trinity College\, Dublin
DTSTART:20090219T133000Z
DTEND:20090219T143000Z
UID:TALK16382@talks.cam.ac.uk
CONTACT:8442
DESCRIPTION:The statistical properties of turbulent jet flows form the bas
 is for noise prediction methodologies\, particularly those based on the ac
 oustic analogy approach. In addition to the time averaged parameters of ve
 locity and the variance of the unsteady parameters of velocity\, shear str
 ess and kinetic energy\, the spatio-temporal properties of length and time
  scale are important as these give information on the convection and dissi
 pation of the turbulence. More recently\, the use of frequency dependent i
 ntegral scales have resulted in improvements in noise predictions. \nIt is
  shown how frequency dependent values for the two-point turbulent properti
 es are determined using a coherence function approach. The results for the
  length scales and the convection velocities are derived from multi-point 
 Laser Doppler Velocimetry (LDV) and Hot-Wire Anemometry (HWA) measurements
  for a range of jet flow conditions including the effect of Mach number\, 
 temperature ratio and nozzle geometry. Empirical models for these properti
 es are proposed and compared with the experimental data. The effect of mod
 elling the frequency dependence on noise predictions is briefly examined.\
 n\n
LOCATION:Lecture Room 6\, Engineering Department
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