Accession Number : AD0666569

Title :   LAMINAR BOUNDARY LAYER CONTROL BY COMBINED BLOWING AND SUCTION IN THE PRESENCE OF ROUGHNESS,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s) : Anderson,G. F. ; Sutera,S. P. ; Murthy,V. S.

Report Date : OCT 1967

Pagination or Media Count : 73

Abstract : The feasibility of maintaining a fully laminar boundary layer on a given two-dimensional body by means of combined blowing and suction and the effectiveness of blowing for increasing the boundary layer's tolerance to roughness are investigated theoretically. The potential flow past the body is determined by using a suitably selected source distribution and then refining the body obtained from this selection by means of slender body techniques. The boundary-layer calculations are then made for various blowing rates at the stagnation point. The calculations indicate that the combination of suction, applied to maintain a laminar boundary layer, and blowing near the stagnation point, to improve the tolerance of the laminar boundary to roughness, can substantially reduce the skin friction of bodies operating at high Reynolds numbers. (Author)

Descriptors :   (*BOUNDARY LAYER CONTROL, LAMINAR FLOW), TWO DIMENSIONAL FLOW, ROUGHNESS, FEASIBILITY STUDIES, LAMINAR BOUNDARY LAYER, SKIN FRICTION, STAGNATION POINT, REYNOLDS NUMBER, EQUATIONS OF MOTION

Subject Categories : Aerodynamics
      Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE