The performance of microflotation, dispersed air flotation with microbubble clouds with bubble size about 50 µm, for algae separation using fluidic oscillation for microbubble generation is investigated. This fluidic oscillator converts continuous air supply into oscillatory flow with a regular frequency to generate bubbles of the scale of the exit pore. Bubble characterization results showed t...

Transonic buffet is an unsteady flow phenomenon that limits the safe flight envelope of modern aircraft. Scale-resolving simulations with span-periodic boundary conditions are capable providing new insights into its physics. The present contribution shows co-existence multiple modes unsteadiness over unswept laminar-flow wing section, appearing in following order increasing frequency: (a) a low...

An experimental study was conducted to investigate static stall hysteresis of a NASA GA(W)-1 airfoil at the chord Reynolds number of Re = 162,000. In addition to mapping the surface pressure distribution around the airfoil, a digital PIV system was used to make detailed flowfield measurements to quantify the occurrence and behavior of laminar boundary layer separation and transition on the airf...

This Review summarizes the progress in research on flow structure and aerodynamic characteristics of an airfoil at a low Reynolds number encountered by near-space low-speed aircrafts micro-air vehicles. The structures several kinds laminar separation bubbles their effect are discussed drawing experimental numerical results reported past few decades. transition process bubble is detailed from va...

Article history: Received 10 June 2014 Received in revised form 29 January 2015 Accepted 3 February 2015 Available online 7 February 2015 In this paper we investigate the instabilities arising in a flow through a compressor passage using BiGlobal stability analysis. The adopted geometry comes from the results of previous experimental and numerical investigations on a linear low-pressure (LP) co...

The effect of leading-edge tubercles on the aerodynamic performance E216 airfoil is studied by steady 3D numerical simulations using Transition γ−Reθ turbulance model. investigation carried out for various angles attack in pre-stall region at Reynolds number 100,000. Various tubercle configurations with different combinations amplitude ranging from 2 mm to 8 and wavelength varying 15.5mm 62 are...