Shrouded Propeller Investigations: Wind Tunnel Tests of a Shrouded Propeller Model with an Elliptical Shroud Exit.

Abstract

WIND TUNNEL TESTS WERE MADE ON A SHROUDED PROPELLER MODEL WITH A SHROUD WHOSE CROSS-SECTION CHANGED FROM CIRCULAR AT THE PROPELLER PLANE TO ELLIPTICAL AT THE EXIT. THE MAJOR AXIS OF THE ELLIPSE WAS PARALLEL TO THE MODEL PITCHING AXIS. THE TRANSITION FROM CIRCULAR TO ELLIPTICAL CROSSSECTION WAS ACHIEVED WITH NO CHANGE IN CROSSSECTIONAL AREAS SO THAT THIS SHROUD CAN BE CONSIDERED AS BEING NON-DIFFUSED. A COMPARISON MODEL WITH A CONFIGURATION IDENTICAL TO THE ABOVE MODEL EXCEPT FOR A CIRCULAR SHROUD EXIT WAS ALSO TESTED. PERFORMANCE OF BOTH MODELS WAS MEASURED THROUGHOUT AN ADVANCE RATIO RANGE FROM ZERO TO ROUGHLY 2.5 AT SEVERAL BLADE PITCH ANGLES AND AT ANGLES OF ATTACK TO 90 DEGREES. A COMPARISON OF THE PERFORMANCE OF THE TWO MODELS INDICATES THAT THE CIRCULAR EXIT MODEL IS SUPERIOR TO THE ELLIPTICAL EXIT MODEL

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1960
Accession Number
AD0248804

Entities

People

  • Vernon O. Hoehne

Organizations

  • Wichita State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Engineering
  • Mechanical Engineering
  • Propellers
  • Propulsion Systems
  • Shrouded Propellers
  • Transitions
  • Wind Tunnel Tests
  • Wind Tunnels

Readers

  • Aerodynamics.
  • Aerodynamics/Aeronautics.