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 20 of 47 for “"Adverse pressure gradient"”.
-
Similarity in adverse pressure gradient turbulent flows
… is to experimentally generate increasingly adverse pressure gradient flow data for comparison with published data, to find similarities allowing categorization leading to improved flow prediction.
-
Vortical flows in an adverse pressure gradient
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
-
Pressure signature in adverse-pressure-gradient wall bounded turbulent flows
… of universal patterns in wall-bounded adverse pressure gradient turbulent flows. For this purpose, the experimental work has been carried out towards further understanding of this class of flows, especially when the pressure gradient is increasingly adverse. Adverse pressure gradient …
-
Active Flow Control of Subsonic Flow in an Adverse Pressure Gradient Using Synthetic Jets and Passive Micro Flow Control Devices
… result in boundary layer separation and loss of pressure recovery which reduces engine performance and in some cases may cause engine stall. Deployment of flow control devices can alleviate this problem to a large extent; however, almost all active flow control devices have some energy penalty …
-
Effects of Supercooled Large -Droplet Icing on Airfoil Aerodynamics
… chord, and the separation bubble formed over the adverse pressure gradient of the clean airfoil, which started at 75% chord. The effect of the ice shape on the NLF 0414 was not as severe as on the NACA 23012m because the lift was much more aft loaded.
-
Boundary layer transition in simulated turbine blade flow
… regions was observed to remain intact for severe adverse pressure gradients, including cases where separation bubbles were present during the early stages of transition.<br/><br/>An original correlation for the spot formation rate parameter, N, was developed using the adverse pressure gradient …
-
Prediction of transitional boundary layer properties for CFD software in engineering flows
… a variety of flows including zero and constant adverse and favourable pressure gradients, and also the varying pressure gradient Rolls Royce T3C flows. The method gives good prediction of skin friction and transition length when the start of transition was in zero and favourable pressure …
-
Camada limite de temperatura com gradiente de pressão adverso
… is modified to consider the presence of the pressure gradient. The compressible laminar boundary layer in an adverse pressure gradient is analyzed on the basis of the momentum and thermal integral equations. A method of calculating the boundary layer as function of the Mach number, uniform …
-
A Numerical Study of Internal Flow Effects on Skin Friction Gages
… skin friction sensor in the presence of a pressure gradient has always been a concern. These effects are studied here with a three-dimensional, Navier-Stokes code based on a finite element method technique. Numerical solutions for cases in which one or more design parameters were varied are …
-
Modelling of Wall Pressure Fluctuations Induced by Turbulent Boundary Layer Flow
… to predict the power spectral density of wall pressure fluctuations in the turbulent boundary layer. From the analysis of current semi-empirical models and a large survey of experimental data, it was found that the models proposed by Goody and Smol'yakov have the lowest mean squared error when …
-
An experimental study of a turbulent wing-body junction and wake flow
… of the body. The junction wake flow entered an adverse pressure gradient region approximately 6 chord lengths downstream. This region's geometry approximated the aft portion of an aircraft fuselage or a submersible's hull. The body geometry was formed by joining a 3:2 elliptic nose to a NACA …
-
Boundary element simulation of oscillating foil with leading-edge separation
… we present a criterion that is related to the adverse pressure gradient to predict the location for the leading-edge separation. Because of the Lagrange scheme of the wake relaxation in the boundary element simulation, the leading-edge wake sheet goes into or through the thin foil easily. In …
-
A simple criterion for three-dimensional flow separation in axial compressors
… is defined to quantify the combined effect of adverse pressure gradient and secondary flow which are the two main mechanisms contributing to the formation of three-dimensional flow separation. There is a critical value of the parameter at which the onset of three-dimensional flow separation …
-
The Space-time Structure of an Axisymmetric Turbulent Boundary Layer Ingested by a Rotor
… turbulent boundary layer under a strong adverse pressure gradient is experimentally studied for its relevance to marine applications, urban air-transportation and turbulence ingestion noise. The combined effect of lateral curvature and streamwise pressure gradient are examined on the mean …
-
Numerical Simulations of Iced Airfoils and Wings
… tended to be near the location of minimum pressure and the location of the most adverse pressure gradient. With the aim of improving the predictive ability of the stall behavior for iced airfoils, simulations using the Detached Eddy Simulation (DES) approach were conducted in the second …
-
Flow characteristics of a transverse water jet into an unconfined water channel
… the jet blockage factor and the magnitude of the adverse pressure gradient on the trailing edge of the jet. This implies that either the jet blockage or the adverse pressure gradient was not strong enough to create an upstream reverse flow near the jet exit close the free surface. The velocity …
-
Passive Flow Control with Shark Skin and the Relevance of Low Speed Streaks to Denticle Actuation
… when the boundary layer must flow against an adverse pressure gradient, the bristling angle may also be related to the local boundary layer thickness, such that a thicker boundary layer requires a higher bristling angle, to achieve flow control. It is hypothesized that the scales act as a …
-
Computational Investigation of Lymphatic Valves and Vessels
… valves, which allow lymphatic pumping against adverse pressure gradient. Despite the importance of the lymphatic system, understanding of lymphatic operation, especially the role of lymphatic valves, is still limited. By using a fully coupled three-dimensional fluid-structure interaction model …
-
Experimental Investigations into Shark Skin Inspired Active Flow Control Mechanisms
… case. In the first set of tests, a zero pressure gradient case, it was found that the actuation of the flaps increased the overall momentum in the boundary layer near the wall,when compared to the flat plate case. This momentum increase helps support the hypothesis that the flexible …
-
Study of Far Wake of a Surface-Mounted Obstacle Subjected to Turbulent Boundary Layer Flows
… Reynolds number of the flow and manipulating the pressure gradient distributions using a NACA 0012 airfoil placed within the wind tunnel test section. The measurements were acquired utilizing a spanwise traversing boundary layer rake and a point pressure sensing microphone array. The findings …
Page 1 of 3