The report describes a wind-tunnel study of a ram-wing-type vehicle with various blowing arrangements. Two models were studied. One model represented a thick vehicle configuration with a blunted rear end. The second had a streamlined chord section. Blowing arrangements consisted of two two-dimensional Coanda nozzles, one placed near the leading edge and one near the midchord. Upward, downward, and mixed blowing arrangements were investigated. The results indicate that the downward blowing near the leading edge and upward blowing at midspan constitute the most promising of those arrangements investigated. With this arrangement the vehicle has high lift capability at zero forward speed and low drag characteristics at all forward speeds. A range of blowing and pressure coefficients at which a considerable increase in lift-to-horsepower ratio takes place (as compared with a case without blowing) also exists. Similarly, blowing arrangements and blowing coefficients that detrimentally affect power economy also exist. In most cases, blowing permits increasing the wing loading efficiency (weight carried per unit area), independently of forward speed or ground clearance. (Author)

  • Corporate Authors:

    IIT Research Institute

    10 West 35th Street
    Chicago, IL  United States  60616
  • Authors:
    • Reba, I
  • Publication Date: 1970-1

Media Info

  • Pagination: 126 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00039172
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: IITRI-J6128-FR Final Rpt
  • Contract Numbers: DOT-7-33512
  • Files: TRIS
  • Created Date: Nov 24 1973 12:00AM