Airfoil gust load alleviation by circulation control

Abstract

This paper presents a numerical investigation on the gust load alleviation effects based on circulation control (CC) via blowing over airfoil trailing-edge Coanda surface. The NACA0012 airfoil was chosen for the study from subsonic to transonic speeds. The field velocity method is introduced to the unsteady Reynolds averaged Navier-Stokes solutions to simulate responses of the airfoil to arbitrarily shaped gust penetrations. For validation, gust responses to a step change in angle of attack, sharp

Gust load alleviation by normal microjet

“…For gust response simulations, the FVM method is integrated into the URANS solutions, which was verified by the authors in Ref. [26]. The numerical responses of a series of gust profiles including a step-change in the angle of attack, sharp-edged gusts and the one-minus-cosine gusts using the 2D rigid NACA0012 airfoil are compared to the Wagner function [27], Küssner function [28] and reference data from Ref.…”

“…1 and further details can be found in Ref. [26]. numerical results and the available data as presented in the following section.…”

“…In [26], the authors demonstrated the adaptive circulation control for gust load alleviation. Since microjet also has a fast response characteristic, it has a similar capability to control the gust load timely with adaptive characteristics.…”

“…Since microjet also has a fast response characteristic, it has a similar capability to control the gust load timely with adaptive characteristics. To test this, the same approach used in [26] is applied here. Based on the data for Cµ0= 9.9×10 -3 shown in Fig.…”

A Low Cost Oscillating Membrane for Underwater Applications at Low Reynolds Numbers

“…Furthermore, they are aero and hydro-dynamically innocuous and can operate only when required. Examples of active control for flow separation prevention are wall-normal synthetic jets [33], tangential jet blowing [34], circulation control [35,36], plasma actuators [37], and oscillating membranes [38]. In these examples, the underlying mechanism to prevent flow separation is to increase the flow momentum in the boundary layer.…”