Accession Number : AD1011636

Title :   Fundamental Characterization of Spanwise Loading and Trailed Wake Vortices

Descriptive Note : Technical Report

Corporate Author : AMRDEC Redstone Arsenal United States

Personal Author(s) : Bhagwat,Mahendra J ; Ramasamy,Manikandan ; Caradonna,Francis X

Full Text :

Report Date : 01 Jul 2016

Pagination or Media Count : 802

Abstract : This report focuses on one of the most prominent flow features of the hovering rotor wake, the close interaction of the tip vortex with a following blade. Such vortex interactions are fundamental determinants of rotor performance, loads, and noise. Yet, they are not completely understood, largely due to the lack of sufficiently comprehensive experimental data. The present study aims to perform such comprehensive measurements, not on hovering helicopter rotors (which hugely magnifies test complexity) but using fixed-wing models in controlled wind tunnel tests. The experiments were designed to measure, in considerable detail, the aerodynamic loading resulting from a vortex interacting with a semi-span wing, as well as the wake resulting from that interaction. The goal of the present study is to answer fundamental questions such as (a) the influence of a vortex passing below a wing on the lift, drag, tip vortex and the wake of that wing, and (b) the strength of the forming tip vortex and its relation to the wing loading and/or the tip loading.

Descriptors :   Trailing vortices , wind tunnel tests , Wind tunnel models , aerodynamics , WAKE

Distribution Statement : APPROVED FOR PUBLIC RELEASE