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Wind-tunnel investigation of a method of boundary-layer control as applied to a reflection plane model
Bondie, Royal J.
Bondie, Royal J.
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1952-04
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Abstract
Wind tunnel tests were conducted at full-scale Reynolds
numbers on a one-half scale model of the semispan of a cessna
170 wing, equipped with suction and blowing slots for boundarylayer
control. The effect of boundary-layer control by suction
and blowing was determined upon lift, drag, aileron
hinge moment, rolling moment, pitching moment, and yawing
moment. General studies were made of the effect of boundarylayer
control upon downwash and flow pattern as well as structure
of the circulation around the wing. The aerodynamic
characteristics of the wing, together with the air quantities
required for boundary-layer control, were studied from
The standpoint of practical design application.
Values of maximum lift coefficient up to 2.93 were secured with total drag coefficients which were considerably less than those which would be predicted by conventional induced drag theory. Aileron effectiveness was improved sufficiently to increase PB/2V values by ratios of 2.5 over the value which could be secured without boundary-layer control. Pitching moments about the aerodynamic center increased to values of -.45, but downwash studies indicated that the angle of downwash increased sufficiently to compensate for the pitching moment by increased down flow at the tail group.
Measurements indicated that the strength of the circulation about the airfoil profile was increased over both the blowing and suction portions of the wing. The effect of this system of control appears not to be limited to the boundary layer only, but to extend to the entire circulation pattern of the wing. The results appear to be quite applicable for design use and are now being studied on a particular application.
Table of Contents
Summary -- Introduction -- Notation -- Equipment and procedure -- Models and equipment -- Test program -- Data corrections -- Results and discussion -- Preliminary tests -- Force tests -- Power effects -- Reynolds number effects -- Flow studies -- Lateral control characteristics -- Airplane lateral control characteristics
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Thesis (M.S.)-- University of Wichita, College of Business Administration and Industry, School of Engineering
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Wichita State University
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Wichita State University