Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"unsteady velocity"”.
-
Further studies of unsteady gas flow in the manifolds of multi-cylinder automobile engines
… an investigation into the general principles of unsteady flow in pipe systems, with analysis of specific flow regions in the manifolds of a carburetted, four-stroke, automotive engine. The unsteady flow calculation is effected by the method of characteristics under the assumption of …
-
Analysis of two- and three-dimensional flow separation
… theory to compressible two-dimensional velocity fields with general time dependence. Specifically, he defines unsteady flow separation as a material instability induced by an unstable manifold of a distinguished boundary point. In this general context, the unstable manifold is a …
-
A Computational Fluid Dynamics Investigation of Thermoacoustic Instabilities in Premixed Laminar and Turbulent Combustion Systems
… acoustics of the combustor are coupled with the unsteady heat release); the second part of the research aims to study the effect of velocity perturbations on the unsteady heat release rate from a burner stabilized laminar flat flame; the third and final part of work involves an extension of the …
-
Modelling of turbulent stratified flames
… These instabilities, caused by the coupling of unsteady heat release and pressure fluctuations can cause significant damage to combustion devices. One method of avoiding these problems whilst still operating a globally lean system is to employ a stratified premixed mode where areas of richer …
-
Prediction of Trailing Edge Noise from Two-Point Velocity Correlations
… by the integral of the cross product between the velocity and vorticity fields, of the boundary layer and shed vorticity (Howe (1978)). To extract the source terms, proper orthogonal decomposition is applied to the velocity cross spectrum to extract modes of the unsteady velocity and vorticity. …
-
Self-sustained combustion of low grade solid fuels in a stagnation-point reverse-flow combustor
… due to enhanced mixing as a result of the highly unsteady velocity field. This roughly corresponds to the location of the reaction zones in the previous SPRF combustors operating on gas and liquid fuels. Planar laser visualization of the reacting flow-field using particle-scattering reveals that …
-
Correlation between Unsteady Loading and Tip Gap Flow Occurring in a Linear Cascade with Simulated Stator-Rotor Interaction
… linearly up to a tip clearance of 7.9% chord. Unsteady pressure was measured on the pressure and suction surfaces at the tip of two cascade blades using an array of 23 microphones mounted subsurface. These measurements reveal that the unsteady pressure at the blade tip is a linear function of …
-
Unsteady Aerodynamics of Compact Axial Compressors
… variations affect the three-dimensional and unsteady flow field in a compact axial compressor both pre-stall and in stall. An experimental study has been conducted using a scaled-up single-stage axial compressor across a Reynolds number range of 10⁴ to 10⁵. Steady and unsteady casing static …
-
Wake bursting: a computational and experimental investigation for application to high-lift multielement airfoil design
… with one of a variety of probes to capture unsteady or steady data such as pressures or velocities. Because all desired flowfield parameters cannot be captured by one probe, results from different probes must be carefully analyzed and compared to other data such that a full understanding of …
-
Turbulent flame microstructure, dynamics, and thermoacoustic instability in swirl-stabilized premixed combustion : measurements, statistics, and analysis
… features several critical regions with large and unsteady velocity derivatives, particularly, a pair of shear layers that divide the incoming flow of reactants from an inner and an outer recirculation zone. As the extinction strain rate increases with increasing equivalence ratio, the flame …