[HTML][HTML] Review of measurement techniques for unsteady helicopter rotor flows
AD Gardner, CC Wolf, M Raffel - Progress in Aerospace Sciences, 2019 - Elsevier
The helicopter group at the DLR in Göttingen has been actively involved in the development
of measurement techniques for unsteady flows, particularly as they apply to the problems …
of measurement techniques for unsteady flows, particularly as they apply to the problems …
Review of rotating wing dynamic stall: Experiments and flow control
Dynamic stall has been a technical challenge and a fluid dynamical subject of interest for
more than fifty years; but in the last decade significant advances have been made in the …
more than fifty years; but in the last decade significant advances have been made in the …
Investigation of three-dimensional dynamic stall on an airfoil using fast-response pressure-sensitive paint
AD Gardner, C Klein, WE Sachs, U Henne, H Mai… - Experiments in …, 2014 - Springer
Dynamic stall on a pitching OA209 airfoil in a wind tunnel is investigated at Mach 0.3 and 0.5
using high-speed pressure-sensitive paint (PSP) and pressure measurements. At Mach 0.3 …
using high-speed pressure-sensitive paint (PSP) and pressure measurements. At Mach 0.3 …
High-speed experiments on combustion-powered actuation for dynamic stall suppression
CG Matalanis, PO Bowles, BY Min, S Jee, AE Kuczek… - AIAA Journal, 2017 - arc.aiaa.org
This work documents high-speed wind-tunnel experiments conducted on a pitching airfoil
equipped with an array of combustion-powered actuators. The main objective of these …
equipped with an array of combustion-powered actuators. The main objective of these …
Combustion-powered actuation for dynamic-stall suppression: high-mach simulations and low-mach experiments
An investigation on the dynamic-stall-suppression capabilities of combustion-powered
actuation applied to a tabbed VR-12 airfoil is presented. In the first section, the results from …
actuation applied to a tabbed VR-12 airfoil is presented. In the first section, the results from …
Boundary layer transition determination for periodic and static flows using phase-averaged pressure data
AD Gardner, K Richter - Experiments in Fluids, 2015 - Springer
A method of boundary layer transition measurement is presented for wind tunnel models
instrumented with surface pressure taps. The measurement relies on taking a number of …
instrumented with surface pressure taps. The measurement relies on taking a number of …
Numerical investigation of jet angle effect on airfoil stall control
Numerical study on flow separation control is conducted for a stalled airfoil with steady-
blowing jet. Stall conditions relevant to a rotorcraft are of interest here. Both static and …
blowing jet. Stall conditions relevant to a rotorcraft are of interest here. Both static and …
Experimental investigation of high-pressure pulsed blowing for dynamic stall control
AD Gardner, K Richter, H Mai, D Neuhaus - CEAS Aeronautical Journal, 2014 - Springer
Dynamic stall control using pulsed blowing is compared with control by constant blowing for
an OA209 airfoil. Flow control was by blowing from 42 portholes, flush with the airfoil …
an OA209 airfoil. Flow control was by blowing from 42 portholes, flush with the airfoil …
Effect of the model-sidewall connection for a dynamic stall airfoil experiment
AD Gardner, K Richter - Journal of Aircraft, 2020 - arc.aiaa.org
THE performance assessment of helicopter rotor blade airfoils no longer relies only on wind-
tunnel testing for performance data in the linear region. For many flow cases, the …
tunnel testing for performance data in the linear region. For many flow cases, the …
Numerical Study on Combustion-Driven Jet Actuation for Aerodynamic Control of Airfoil Flows
In this study, a numerical investigation is conducted on combustion-driven pulsed-jet
actuation to control the flow around a lifting surface. Based on relevant experimental …
actuation to control the flow around a lifting surface. Based on relevant experimental …