BACKGROUND African horse sickness (AHS) is of importance to health and international trade in horses worldwide. During export from and transit through AHS endemic countries or zones, physical and chemical measures to protect horses from the vectors of AHS virus (AHSV) are recommended by the World Organization for Animal Health. Protection of containerized air transport systems for horses (jet s...

Precise and inexpensive uncertainty quantification (UQ) is crucial for robust optimization of compressor blades to control manufacturing tolerances. This study looks into the suitability MC−adj−nonlinear, a nonlinear adjoint-based approach, precisely rapidly assess performance discrepancies transonic blade section, arising from geometric alterations, building upon previous research. In order pr...

While most wind energy comes from large utility-scale machines, small turbines (SWTs) can still play a role in off-grid installations or the context of distributed production and smart systems. Over years, these machines have not received same level aerodynamic refinement their larger counterparts, resulting notably lower efficiency and, therefore, higher cost per installed kilowatt. In an effo...

Birds routinely execute post-stall maneuvers with a speed and precision far beyond the capabilities of our best aircraft control systems. One remarkable example is a bird exploiting post-stall pressure drag in order to rapidly decelerate to land on a perch. Stall is typically associated with a loss of control authority, and it is tempting to attribute this agility of birds to the intricate morp...

In this paper we evaluate the actuator rate requirements for control of rotating stall using a bleed valve and provide tools for predicting these requirements. Modiication of both the stable and unstable parts of the compressor characteristic via addition of continuous air injection serves to reduce the requirement of a bleed valve used for the purpose of rotating stall stabilization. Analytica...

Abstract The present study investigates stall-induced vibrations on a IEA-15-RWT wind turbine blade. At standstill and under specific strong crosswind conditions, simulations using the codes OpenFAST DeepLines Wind TM exhibit large-amplitude vibrations. Results of both are first compared, showing an overall good agreement. Then, influence misalignment angle is assessed as well choice aerodynami...

We investigate the use of simple aerodynamic models for the feedback control of underactuated aerial vehicles flying with large flight envelopes. Thrust-propelled vehicles with a body shape symmetric with respect to the thrust axis are considered. Upon a condition on the aerodynamic characteristics of the vehicle, we show that the equilibrium orientation can be explicitly determined as a functi...

The notions of basic controllability and basic control are deened. A quadratic optimal control of the linearized viscous Moore-Greitzer equation is presented and it is connrmed that stall is uncontrollable in this model. A basic control is constructed for the nonlinear viscous Moore-Greitzer equation which can control both surge and stall. Some extensions of this construction are discussed. Num...

A small flag attached to the surface of an airfoil near leading-edge exhibits self-excited oscillations when is set at a post-stall angle attack. The limit cycle between and freestream produce vortices periodically, resulting in remarkable increase maximum lift coefficient stall angle. There are strong similarities this passive flow control method, which relies on fluid-structure interactions, ...