Helicopter brownout - can it be modelled?

Significant progress has been made to date in modelling, computationally, the formation and development of the dust cloud that forms in the air surrounding the rotorcraft under brownout conditions. Modern computational methods are able to replicate not only the development of the dust cloud in appropriate operational scenarios, but also the sensitivity of the shape and density of the dust cloud to the detailed design of the rotorcraft. Results so far suggest that attempts to ameliorate brownout by aerodynamic means, for instance by modifying the rotor properties, will be frustrated to some extent by the inherent instability of the flow field that is produced by the helicopter. Nonetheless, very recent advances in understanding the fundamental mechanisms that lead to the formation of the dust cloud may allow substantial progress to be made once certain elements of the basic physics of the problem are more fully understood and better quantified.

[1]  Daniel A. Wachspress,et al.  Physics Based Modeling of Helicopter Brownout for Piloted Simulation Applications , 2008 .

[2]  Catriona Phillips,et al.  Eulerian Simulation of the Fluid Dynamics of Helicopter Brownout , 2009 .

[3]  Catriona Phillips,et al.  The flow physics of helicopter brownout , 2010 .

[4]  R. J. Munro,et al.  Sediment resuspension and erosion by vortex rings , 2009 .

[5]  Glen R. Whitehouse,et al.  Modelling Rotor Wakes in Ground Effect , 2004 .

[6]  Massimiliano Giona,et al.  Laminar dispersion at high Péclet numbers in finite-length channels: Effects of the near-wall velocity profile and connection with the generalized Leveque problem , 2009 .

[7]  Daniel,et al.  A High Fidelity Brownout Model for Real-Time Flight Simulations and Trainers , 2009 .

[8]  Leishman,et al.  Investigation of Sediment Entrainment in Brownout Using High-Speed Particle Image Velocimetry , 2009 .

[9]  Catriona Phillips,et al.  The effect of helicopter configuration on the fluid dynamics of brownout , 2008 .

[10]  C. Phillips.  Computational study of rotorcraft aerodynamics in ground effect and brownout , 2010 .

[11]  Chatten Cowherd,et al.  Sandblaster 2 Support of See-Through Technologies for Particulate Brownout , 2007 .

[12]  H. C. Curtiss,et al.  Rotor Aerodynamics in Ground Effect at Low Advance Ratios. , 1984 .

[13]  J. Gordon Leishman,et al.  In-Ground-Effect Aerodynamics of Rotors with Different Blade Tips , 2010 .

[14]  Hyo Won Kim,et al.  The effect of rotor design on the fluid dynamics of helicopter brownout , 2009 .

[15]  Andrea,et al.  Numerical Analysis of Unsteady Vortical Flows Generated by a Rotorcraft Operating on Ground: A First Assessment of Helicopter Brownout , 2009 .

[16]  Green,et al.  Measurements of a Rotor Flow in Ground Effect and Visualisation of the Brown-out Phenomenon , 2008 .

[17]  Leishman,et al.  Mesoscale Sediment Tracking Methodology to Analyze Brownout Cloud Developments , 2010 .