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This thesis offers new insights into the fluid flow behavior of
automotive centrifugal compressors operating under near-stall
conditions. Firstly it discusses the validation of
three-dimensional computational fluid dynamics (CFD) unsteady
simulations against acoustic experimental measurements using an
original procedure based on plane wave pressure decomposition. It
then examines the configuration of the CFD cases, highlighting the
key parameters needed for a successful calculation. Moreover, it
describes both the compressor mean and unsteady flow field from
best-efficiency to near-surge operating points. Lastly, it provides
readers with explanations of the various phenomena that arise when
the mass flow rate is reduced and the compressor is driven to poor
and noisy performance. Written for students, researchers and
professionals who want to improve their understanding of the
complex fluid flow behavior in centrifugal compressors, the thesis
offers valuable practical insights into reducing the acoustic
emissions of turbochargers.
This thesis offers new insights into the fluid flow behavior of
automotive centrifugal compressors operating under near-stall
conditions. Firstly it discusses the validation of
three-dimensional computational fluid dynamics (CFD) unsteady
simulations against acoustic experimental measurements using an
original procedure based on plane wave pressure decomposition. It
then examines the configuration of the CFD cases, highlighting the
key parameters needed for a successful calculation. Moreover, it
describes both the compressor mean and unsteady flow field from
best-efficiency to near-surge operating points. Lastly, it provides
readers with explanations of the various phenomena that arise when
the mass flow rate is reduced and the compressor is driven to poor
and noisy performance. Written for students, researchers and
professionals who want to improve their understanding of the
complex fluid flow behavior in centrifugal compressors, the thesis
offers valuable practical insights into reducing the acoustic
emissions of turbochargers.
Offering the most modern psychological techniques, this guide to
breaking the habit of smoking provides useful advice so that
readers can avoid paying for costly professional treatments. Using
clear and concise language, this book focuses on developing
readers' self-control and offers various approaches both for those
looking to quit cold-turkey as well as those who prefer a slower
approach. Although mostly aimed at smokers attempting to quit,
whether it be for the first time or not, this book will also prove
useful to doctors, educators, legislators, psychologists, and
others who work towards improving healthcare and health education.
"Ofreciendo las tecnicas psicologicas mas modernas, esta guia para
romper el habito de fumar provee consejos utiles para que el lector
no tenga que pagar por tratamientos profesionales costosos. Usando
un lenguaje claro y conciso, este libro se enfoca en desarrollar el
auto-control del lector y ofrece varios enfoques, tanto para
aquellos que quieren dejar de fumar de golpe como para aquellos que
prefieren dejar de fumar poco a poco. Aunque mayormente esta
destinado a fumadores que buscan romper el habito, ya sea por
primera vez o no, este libro tambien sera util para doctores,
educadores, legisladores, psicologos y otros quienes trabajan para
mejorar la salud y la ensenanza de la salud."
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