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research-article

EXPERIMENTAL STUDY ON PRESSURE LOSSES IN POROUS MATERIALS

[+] Author and Article Information
Giacomo Fantozzi

Siemens Industrial Turbomachinery AB
giacomofantozzi@live.it

Mats Kinell

Siemens Industrial Turbomachinery AB, Slottsvaegen 2-6, SE-612 31 Finspang, Sweden
mats.kinell@siemens.com

Sara Rabal Carrera

Siemens Industrial Turbomachinery AB, Slottsvaegen 2-6, SE-612 31 Finspang, Sweden
sara.rabal@siemens.com

Jenny Nilsson

Siemens Industrial Turbomachinery AB, Slottsvaegen 2-6, SE-612 31 Finspang, Sweden
jenny.nilsson@siemens.com

Yves Kuesters

Siemens AG, Corporate Technology, Research In Energy and Electronics, Coatings & Additive Manufacturing, CT REE MDM COA-DE, Siemensdamm 50, 13629 Berlin, Deutschland
yves.kuesters@siemens.com

1Corresponding author.

ASME doi:10.1115/1.4040868 History: Received June 25, 2018; Revised July 02, 2018

Abstract

Recent technological advances in the field of additive manufacturing have made possible to manufacture turbine engine components characterized by controlled permeability in desired areas. These have shown great potential in cooling application such as convective cooling and transpiration cooling and may in the future contribute to an increase of the turbine inlet temperature. This study investigates the effects of the pressure ratio, the thickness of the porous material and the hatch distance used during manufacturing on the discharge coefficient. Moreover, two different porous structures were tested and in total 70 test objects were investigated. Using a scanning electron microscope, it is shown that the porosity and pore radius distribution, which are a result from the used laser power, laser speed and hatch distance during manufacturing, will characterize the pressure losses in the porous sample. Furthermore, the discharge coefficient increases with increasing pressure ratio, while it decreases with increasing thickness to diameter ratio. The obtained experimental data was used to develop a correlation for the discharge coefficient as a function of the geometrical properties and the pressure ratio.

Siemens AG
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