Sökning: "transonic flow"

Visar resultat 31 - 35 av 36 avhandlingar innehållade orden transonic flow.

1. 31. Advanced Fluid-Structure Interaction Modelling and Simulation for Aerospace Applications

   Författare :Stefan Nilsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aeroacoustics; Hybrid RANS-LES; CSD; cavity flow; aeroelastics; CFD; FSI;

   Sammanfattning : Numerical fluid-structure interaction (FSI) methods for the prediction of aeroelastic phenomena are important within aerospace. The continuous development of computer technologies has enabled the use of more advanced FSI methods. The use of advanced methods has the potential to provide more accurate predictions. LÄS MER

3. 32. Numerical investigation of blade flutter at or near stall in axial turbomachines

   Författare :Wolfgang Höhn; KTH; []
   Nyckelord :;

   Sammanfattning : During the design of the compressor and turbine stages oftoday's aeroengines aerodynamically induced vibrations becomeincreasingly important since higher blade load and betterefficiency are desired. Aerodynamically induced vibrations inturbomachines can be classified into two general categories,i.e. LÄS MER

4. 33. Contributions to Variable Fidelity MDO Framework for Collaborative and Integrated Aircraft Design

   Författare :Zhang Mengmeng; Arthur Rizzi; Leifsson Leifur; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aerospace Engineering; Flyg- och rymdteknik;

   Sammanfattning : The thesis develops computational tools for early stages of the aircraft design process. The work focuses on a framework which allows several design teams concurrently to develop a baseline concept into a configuration which meets requirements and whose aerodynamics has been assessed by flight simulation. LÄS MER

5. 34. Numerical methods for load prediction in acoustic fatigue

   Författare :Johan Nilsson; Byggnadsmekanik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Acoustic fatigue can occur in structural elements of an aircraft exposed to very high sound pressures. To deal with acoustic fatigue, mainly empirical methods have been applied and often late in the design phase. Current design guidelines have several limitations. First, they do not say anything about the load intensities. LÄS MER

7. 35. CFD Methods for Predicting Aircraft Scaling Effects

   Författare :Karl Pettersson; Arthur Rizzi; Bryan Richards; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CFD; Scaling Effects; Boundary Layer Transition; Preconditioning; Vehicle engineering; Farkostteknik;

   Sammanfattning : This thesis deals with the problems of scaling aerodynamic data from wind tunnel to free flight  conditions. The main challenges when this scaling should be performed is how the model support, wall interference and the potentially lower Reynolds number in the windtunnel should be corrected. LÄS MER