Title: Jet-induced pressure distribution under platform in ground effect

Authors: Ryan K. Soderlund, Konstantin I. Matveev

Addresses: School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164-2920, USA. ' School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164-2920, USA

Abstract: Power Augmented Ram (PAR) vehicles are supported by the dynamic air cushion formed by air jets injected below the vehicle platform. An experimental study has been undertaken to determine steady-state pressure distribution under a static PAR model. Main controlled parameters include the jet thickness, platform height, and deflection of the aft flap in a quasi-two-dimensional system. The potential-flow theory with empirical corrections for the jet expansion provides realistic pressure estimations for the high-pressure zone under the platform. Conducted tests confirm high lift efficiency of PAR systems and demonstrate variations in the centre of pressure with changing the aft flap position.

Keywords: PAR vehicles; power augmented ram; ground effect; jet-induced lift; vehicle design; dynamic air cushion; air jets; steady-state pressure distribution; modelling; jet thickness; platform height; aft flap deflection; potential flow theory; jet expansion.

DOI: 10.1504/IJVD.2010.033826

International Journal of Vehicle Design, 2010 Vol.53 No.3, pp.133 - 148

Received: 02 Apr 2008
Accepted: 12 Dec 2008
Published online: 02 Jul 2010 *

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