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Lift Increase Obtained with Boundary Layer Suction on a 10% Double Wedge Airfoil with a 20% Chord Leading and Trailing Edge Flaps


Davidson, Harold William (1951) Lift Increase Obtained with Boundary Layer Suction on a 10% Double Wedge Airfoil with a 20% Chord Leading and Trailing Edge Flaps. Engineer's thesis, California Institute of Technology. doi:10.7907/KPZ6-2V51.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. In this investigation a study was made of the effects of boundary layer control on a 10% thick, double-wedge airfoil located between endplates. In particular, the study centered around a "high-lift" investigation in order to obtain an optimum configuration for the specific airfoil. The double-wedge airfoil was used since: 1) it is a "high speed" airfoil, and 2) it has poor maximum lift and stalling characteristics. The model used was equipped with a nose flap and a slotted trailing edge flap, both of 20% wing chord, and two suction slots, one aft of the nose flap (20% chord) and the other at the 70% wing chord. Five suction quantities were used on all possible configuration combinations. The maximum lift coefficient obtained was [...] = 2.149 at an angle of attack of 21° and a suction quantity equal to C[subscript Q] = 0.0071.* For this particular configuration, the approximate value of the horsepower required to supply the necessary suction quantity was determined. In addition to the force and moment tests, tuft studies of flow of the "optimum" configurations were made and reported. * Configuration: Nose flap deflected 30°; trailing edge flap deflected 30°; slot [...](forward slot)

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautical engineering
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Millikan, Clark Blanchard
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1951
Record Number:CaltechETD:etd-03192009-110707
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1025
Deposited By: Imported from ETD-db
Deposited On:19 Mar 2009
Last Modified:25 Apr 2023 01:09

Thesis Files

PDF (Davidson_hw_1951.pdf) - Final Version
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