Effects of periodic blowing through flush transverse slots on turbulent boundary layer skin friction
National Aeronautics and Space Administration, 1966 - Music - 67 pages
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0.025 inches Figure 0.250 inches Figure 1.000 inches Figure BLOWING 40 blowing slot BLOWING WITHOUT BLOWING boundary layer channel continuous blowing cycles per second downstream drag decrease drag reduction f CPS I60 f I20 CPS feet per second Figure 10 Continued Figure 12 Continued frequency range ft3/sec Helmholtz resonator hot-wire probes hot-wire signal I20 f CPS inches Figure 12 jet pulses LING-TEMCO-VOUGHT Longitudinal turbulence spectrum longitudinal vortices low turbulence air LTV Research Center NASA o~WITH BLOWING periodic blowing power requirements pressure differential pulse form pulse frequency pulses per second reductions in skin region rotary valve shown in Figure skin friction balance skin friction drag skin friction increase skin friction reduction Spangler Station 15.7 inches Station 6.9 inches sublayer test section wall transverse disturbances transverse vortices turbulence level turbulence reduction turbulent boundary layer Turbulent Skin Friction values velocity profiles wall shear stress