Accession Number : AD0248804

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

Corporate Author : WICHITA STATE UNIV KS SCHOOL OF ENGINEERING

Personal Author(s) : HOEHNE, VERNON O.

Report Date : DEC 1960

Pagination or Media Count : 1

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

Descriptors :   *AERODYNAMIC CHARACTERISTICS, *RING WINGS, *SHROUDED PROPELLERS, *WIND TUNNEL MODELS, ASPECT RATIO, DRAG, DUCTED FANS, LIFT, MODEL TESTS, MOMENTS, POWER, PRESSURE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE