Sökning: "Counter rotating"

Visar resultat 1 - 5 av 28 avhandlingar innehållade orden Counter rotating.

1. 1. An experimental study of fiber suspensions between counter-rotating discs

   Författare :Charlotte Ahlberg; Daniel Söderberg; Fredrik Lundell; Srdjan Sasic; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fiber suspension flow; rotating discs. shear flow; self-organization of fibers; Fluid mechanics; Strömningsmekanik;

   Sammanfattning : The behavior of fibers suspended in a flow between two counter-rotating discs has been studied experimentally. This is inspired by the refining process in the papermaking process where cellulose fibers are ground between discs in order to change performance in the papermaking process and/or qualities of the final paper product. LÄS MER

3. 2. Turbomachinery Aeroacoustic Calculations using Nonlinear Methods

   Författare :Martin Olausson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nonlinear; CFD; Time Spectral; CAA; Ffowcs-Williams Hawkings; Broadband; Time lag; Computational Aeroacoustics; Fan-Noise; Rotor-Stator interaction; Buffer layer; Oscillating sphere; Newton-GMRES; Computational Fluid Dynamics; Acoustic analogies; Sponge; Counter-Rotating Propfan; Harmonic Balance Technique; Tone; FWH; Chorochronic periodicity; Hybrid RANS LES;

   Sammanfattning : Noise regulations for aircraft that fly over populated areas are becoming continuously stricter. This in combination with increasing computational capabilities has boosted interest in aeroacoustic computations in the aerospace industry. LÄS MER

4. 3. The rotating injector as a tool for exploring DI diesel combustion and emissions formation processes

   Författare :Magnus Sjöberg; KTH; []
   Nyckelord :diesel spray combusion; rotating injector. Air swirl; air fuel-mixing. Soot. NO. CO; flame visualization. Chemking modeling. Soot deposition;

   Sammanfattning : A diesel fuel injector has been modified to allow rotationaround its axis, driven by an electric motor. Injections at upto 6000 rpm from the rotating injector have been investigatedunder the influence of air swirl on one optical research engineand one optically accessible heavy-duty diesel engine. LÄS MER

5. 4. A study on axially rotating pipe and swirling jet flows

   Författare :Luca Facciolo; Herik Alfredsson; Helge I. Andersson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fluid mechanics; Strömningsmekanik;

   Sammanfattning : The present study is an experimental and numerical investigation on rotating flows. A special facility has been built in order to produce a turbulent swirling jet generated by a fully developed rotating pipe flow and a Direct Numerical Simulation (DNS) code has been used to support and to complement the experimental data. LÄS MER

7. 5. Numerical Methods for Aeroacoustic Analysis of Turbomachinery

   Författare :Daniel Lindblad; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Convective Ffowcs Williams - Hawkings Equation; Computational Aeroacoustics; Acoustic Analogy; Von Neumann Stability Analysis; Tonal Noise; CAA; Harmonic Balance Method; Counter Rotating Open Rotor;

   Sammanfattning : Air transportation is today an integral part of many peoples life and it continuously grow to serve more of us in new and ingenious ways. There are however negative sides to this growth as well, such as increased noise around airports and more CO2 emissions, which must be addressed if aviation is to be part of a sustainable future. LÄS MER