The flow around a helicopter main rotor in ground effect

Nathan, N. and Green, R. (2012) The flow around a helicopter main rotor in ground effect. Experiments in Fluids, 52(1), pp. 151-166. (doi: 10.1007/s00348-011-1212-1)

Abstract

Wind tunnel measurements of the wake below and ahead of a model helicopter main rotor in simulated forward flight in ground effect are presented. The wind tunnel used was equipped with a rolling road, and the ground speed was matched to the wind tunnel speed for a representative simulation in the wind tunnel of forward flight over the ground. Particle image velocimetry was used to investigate the structure of the wake, and it was observed that the moving ground had a remarkable effect on the flow; the wake is closer to the rotor and its size is reduced compared with the stationary ground case. The detailed distribution of vorticity within the wake is affected by the moving ground, and the mechanism for this is discussed in the paper.

• Item Type: Articles
• Keywords: Helicopter, brown out, rotorcraft, fluid dynamics
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Green, Dr Richard
• Authors: Nathan, N., and Green, R.
• College/School: College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Research Group: Aerospace Sciences
• Journal Name: Experiments in Fluids
• ISSN: 0723-4864
• ISSN (Online): 1432-1114
• Published Online: 01 January 2011