Accession Number : AD0102025


Title :   INVESTIGATION OF UNSTEADY FLOW PAST FOUR NACA 6-PERCENT-THICK AIRFOIL SECTIONS


Descriptive Note : Research memo.


Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMIN LANGLEY RESEARCH CENTER HAMPTON VA


Personal Author(s) : LADSON, CHARLES L ; LINDSEY, WALTER F


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/102025.pdf


Report Date : 26 Jul 1956


Pagination or Media Count : 21


Abstract : An investigation of the intensity of root-mean-square pressure pulsations and root-mean-square normal-force-coefficient fluctuations has been conducted on two NACA high-lift airfoils and two NACA 6-series airfoils. The results at Mach numbers and normal-force coefficients where the fluctuations and pulsations attained significant magnitudes indicated that the NACA high-lift airfoil sections were inferior to the NACA 6-series airfoils with respect to both pulsating pressures and fluctuating forces. It was also observed that an airfoil section which has low values of fluctuating normal force may, because of phase effects, have higher values of pulsating pressures or local panel loads than an airfoil section which has a higher value of fluctuating normal force.


Descriptors :   *UNSTEADY FLOW , *AIRFOILS , GUST LOADS , MACH NUMBER , HIGH LIFT , PRESSURE , PULSES , AERODYNAMIC CHARACTERISTICS


Subject Categories : Aircraft
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE