Experimental Study of Helicopter Fuselage Drag

Numerical and Experimental Investigation of Helicopter Fuselage Aerodynamics

The aerodynamic characteristics of an isolated MRH 90 helicopter fuselage have been investigated using Computational Fluid Dynamics (CFD). Simulations utilised an unstructured tetrahedral grid and both the k-ε and k-ω SST turbulence models were investigated. Standard ‘law of the wall’ wall functions were incorporated, along with a segregated finite volume solver. A wind tunnel testing program w...

An Experimental Study of the Autonomous Helicopter Landing Problem

Image-based information is useful for a variety of autonomous vehicle applications such as obstacle avoidance, map generation, target tracking and motion estimation. Cameras are inexpensive and operate at a high temporal rate. This, coupled with advances in processing power, makes images-based techniques invaluable in autonomous systems operation. In this paper we propose and experimentally inv...

Experimental contradictions of Fresnel drag.

An Experimental Study of Surge Control in a Helicopter Gas

An experimental study was performed to identify the surge inception dynamics and to demonstrate an active surge control on a 600 HP class Allison 250-C30 gas turbine engine. Throttling orifices inserted between the compressor and the combustor were used to move the steady state operating line toward the surge line. The compressor was then adjustably throttled into surge using water injection do...

The External Drag of Fuselage Side Intakes: Rectangular Intakes with Compression Surfaces Vertical

SUMMARY An experiment designed to measure the external drag of fuselage side intakes is described. The scope of the experiment and the techniques employed are discussed and an assessment is made of the accuracy of results. Measurements of the external drag of rectangular intakes installed on the sides of a fuselage are presented. Results at subsonic speeds show that drag at full flow is indepen...