Unsteady aerodynamics: retrospect and prospect

Abstract

This paper reviews some current problems in unsteady aerodynamics and discusses some future challenges. The emphasis is on problems associated with separated flows, such as buffeting and limit cycle oscillations. Suggestions are made to indicate how experimental facilities (such as cryogenic windtunnels) and computational fluid dynamics might be exploited to address these questions.

An experimental study of transonic shock/boundary layer interactions subject to downstream pressure perturbations

“…Bruce). buffet phenomenon [8,9], while in transonic diffusers, disturbances generated in the boundary layer downstream of the interaction region have been linked to large-scale unsteady shock motion [7,12]. In contrast, disturbances that originate upstream of transonic interactions have been found to produce shock unsteadiness of a somewhat smaller scale that is often of less concern.…”

Numerical Computation of Unsteady Compressible Flow past a Plunging Aerofoil

“…Unsteady flows are encountered in many aerospace applications and prediction of unsteady air loads plays a vital role in aircraft and helicopter design (Mabey, 1999;McCroskey 1982;McCroskey, W. J. 1988).…”

CFD Analysis of Oscillating Airfoil during Pitch Cycle

“…In many cases, dynamic stall becomes primary limiting factor in the performance of the associated vehicle or structure. Unsteady flows are encountered in many aerospace applications and prediction of unsteady air loads plays a vital role in aircraft and helicopter design [1][2][3]. Since wind tunnel testing of unsteady flow situations is difficult and expensive, computational studies of wing stall, dynamic stall, blade-vortex interaction of helicopter rotors and aeroelastic problems like flutter, buffeting and gust-response etc., can provide important design data.…”