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

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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 layers 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

Author(s):
Anderson, G. F. ; Sutera, S. P. ; Murthy, V. S.
Author Organization(s):
PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB
Supplementary Note:
Prepared in cooperation with Brown Univ., Providence, R. I. Div. of Engineering.
Pagination:
0073

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
WT-51
Contract/Grant Number(s):
NOw-65-0123
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*BOUNDARY LAYER CONTROL, LAMINAR FLOW), TWO DIMENSIONAL FLOW, ROUGHNESS, FEASIBILITY STUDIES, LAMINAR BOUNDARY LAYER, SKIN FRICTION, STAGNATION POINT, REYNOLDS NUMBER, EQUATIONS OF MOTION
Field(s)/Group(s):
Aerodynamics, Aircraft, Fluid Mechanics
Keyword(s):
BLOWING, SUCTION
Report Date:
1967 Oct 01