38 research outputs found
Schlieren Studies of Compressibility Effects on Dynamic Stall of Airfoils in Transient Pitching Motion
Compressibility effects on the flowfield of an airfoil
executing rapid transient pitching motion from 0 - 60 degrees
over a wide range of Mach numbers and pitching
rates were studied using a stroboscopic schlieren flow visualization
technique. The studies have led to the first direct
experiments] documentation of multiple shocks on the
airfoil upper surface flow for certain conditions. Also, at
low Mach numbers, additional coherent vortical structures
were found to be present along with the dynamic stall vortex,
whereas at higher Mach numbers, the flow was dominated
by a single vortex. The delineating Mach number
for significant compressibility effects was 0.3 and the dynamic
stall process was accelerated by increasing the Mach
number above that value. Increasing the pitch rate monotonically
delayed stall to angles of attack as large as 27
degrees.AFOSR-MIPR-87-0029 and 88-0010NAVAIRAR
Effect of Pivot Point on Aerodynamic Force and Vortical Structure of Pitching Flat Plate Wings
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106512/1/AIAA2013-792.pd
Aerodynamics of Pitching Wings: Theory and Experiments
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140444/1/6.2014-2881.pd
Evaluation of Turbulence Models for Unsteady Flows of an Oscillating Airfoil
The article of record as published may be found at http://dx.doi.org/10.1016/0045-7930(95)00016-6Unsteady flowfields of a two-dimensional oscillating airfoil are calculated using an implicit, finite-difference, Navier Stokes numerical scheme. Five widely used turbulence models are used with the numerical scheme to assess the accuracy and suitability of the models for simulating the retreating blade stall of helicopter rotor in forward flight. Three unsteady flow conditions corresponding to an essentially attached flow, light-stall, and deep-stall cases of an oscillating NACA 0015 wing experiment were chosen as test cases for computations. Results of unsteady airloads hysteresis curves, harmonics of unsteady pressures, and instantaneous flowfield patterns are presented. Some effects of grid density, time-step size, and numerical dissipation on the unsteady solutions relevant to the evaluation of turbulence models are examined. Comparison of unsteady airloads with experimental data show that all models tested are deficient in some sense and no single model predicts airloads consistently and in agreement with experiment for the three flow regimes. The chief findings are that the simple algebraic model based on the renormalization group theory (RNG) offers some improvement over the Baldwin Lomax model in all flow regimes with nearly same computational cost. The one-equation models provide significant improvement over the algebraic and the half-equation models but have their own limitations. The Baldwin-Barth model overpredicts separation and underpredicts reattachment. In contrast, the Spalart-Allmaras model underpredicts separation and overpredicts reattachment.DAAL03-90-C-0013Approved for public release; distribution is unlimited
Reattachment Studies of an Oscillating Airfoil Dynamic Stall Flow Field
The reattaching flow over an oscillating airfoil executing
large amplitude sinusoidal motion around a
mean angle of attack of 10 degrees has been studied
using the techniques of stroboscopic schlieren,
two component laser Doppler velocimetry and point
diffraction interferometry, for a free stream Mach
number of 0.3 and a reduced frequency of 0.05. The
results show that the dynamically stalled flow reattaches
in a process that begins when the airfoil is very
close to the static stall angle on its downward stroke
and progresses over the airfoil through a large range of
angles of attack as the airfoil angle decreases to about
6 degrees. The airfoil suction peak shows a dramatic
rise as the static stall angle is approached and the
velocity profiles develop such that the flow near the
surface is accelerated. The process completes through
the disappearance of a separation bubble that forms over the airfoil.Army Research Office grant (MIPR-ARO-132-90) to the Naval Postgraduate SchoolAFOSR (MIPR-91-0007)NAVAIRArmy Research Office grant (MIPR-ARO-132-90) to the Naval Postgraduate SchoolAFOSR (MIPR-91-0007)NAVAI