Measurement and simulation of pressure drop across replicated porous aluminium in the Darcy-Forchheimer regime

Experimental measurements of the pressure drop across porous metals have been compared with computational fluid dynamics simulations, for the first time, for structures typified by large pores with small interconnecting “windows”. Structural information for the porous structures was obtained from X-ray computed tomography and a robust methodology for developing a representative volume element is described. The modelling approach used was able to reliably predict the pressure drop behaviour within the Forchheimer regime. The methodology was extended to simulate flow through geometrically-adapted, “semi-virtual” pore structures and this approach could prove to be an invaluable tool in the design of porous metal components for applications involving fluid flow

Purge and Mainstream Flow Interaction Control by Means of Platform Circumferential Contouring

This study presents an attempt to reduce the losses produced by the purge flow in a turbine stage by incorporating circumferential platform contouring. Two contours are proposed and compared against a baseline at different levels of swirl. The computational simulations were performed using a RANS three-dimensional Computational Fluid Dynamics code with the Shear Stress Transport turbulence model. The results of steady simulations demonstrate that for the first contour, when the flow is swirled to 50% of the rim speed, the purge flow exits the cavity with less cross flow. This in turn reduces the strength of the passage vortex. However, at swirl extremes of 0% and 100% the baseline has the best perfomance. The results show that a carefully desgined platform could reduce losses when the operating condition is in the proximity of 50% swirl. © 2011 by Siemens Energy, Inc

Archeologische Rapporten bergen op Zoom 2

Een kleinschalig onderzoek in de binnenstad, op een achtererf van de Goudenbloemstraat. Bij het uitgraven van een grote vijver stuitte de eigenaar op skeletresten. Nader onderzoek wees uit dat onder de tuin de oude grens tussen het Minderbroederkerkhof en het huisperceel gesitueerd was. Twee begravingen in situ dateerden uit de 16de of 17de eeuw. Oudere sporen bestonden uit een greppel uit de 14de eeuw en een omvangrijke beerkuil uit de vroege 16de eeuw