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 “"Turbulators"”.
-
Computation of heat transfer in turbine rotor blade cooling channels with angled rib turbulators
… and walls with 45 degree angled and V-shaped rib turbulators were investigated numerically using an unstructured, incompressible, Reynolds-averaged Navier-Stokes flow solver. The influence of 45 degree angled ribs and channel orientation on the local Nusselt number ratios for leading and trailing …
-
Experiments and simulation of shaped film cooling holes fed by crossflow with rib turbulators
… crossflow channel. In this study, angled rib turbulators were installed in two geometric configurations inside the internal crossflow channel, at 45° and 135°, to assess the impact on film cooling effectiveness. Film cooling hole inlets positioned in both pre-rib and post-rib locations tested …
-
Numerical investigation of wire coil heat transfer augmentation
The enhancement of turbulance through the use of turbulators has been studied extensively in the past. The copper coil insert has been tested via experimental research which presented data sufficient enough to conclude that such turbulators would be effective when used in all high-heat load/flux …
-
Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique
… method, multipass coolant channels with rib turbulators, large diameter radially outward channels with rib turbulators, and jet impingement cooling schemes are studied during rotation. 90deg, W, and M-shaped rib enhancements are studied and detailed heat transfer measurements clearly capture …
-
Heat Transfer for High Aspect Ratio Rectangular Channels in a Stationary and Rotating Serpentine Passage with Turbulated and Smooth Surfaces
… surfaces turbulated. For the turbulated cases, turbulators skewed 45° to the flow are installed on the top and bottom walls. The square turbulators are arranged in an offset parallel configuration with a fixed rib pitch-to-height ratio (P/e) of 10 and a rib height-to-hydraulic diameter ratio …
-
Detailed Heat Transfer Measurements of Various Rib Turbulator Shapes at Very High Reynolds Numbers Using Steady-state Liquid Crystal Thermography
… blades feature serpentine passages where rib turbulators are installed to enhance heat transfer between the relatively colder air bled off from the compressor and the hot internal walls. Most of the prior studies have been restricted to Reynolds number of 90000 and several studies have been …
-
Thermo-Hydraulic Performance of Partially Blocked Metal-Foam Channels
… performance, hence displaying potential as good turbulators. The plated configurations were found to perform better in almost all scenarios when compared to their non-plated counterparts. Furthermore, a new simplified analytical model is introduced that considers the flow in the partially-blocked …
-
Development of Advanced Internal Cooling Technologies for Gas Turbine Airfoils under Stationary and Rotating Conditions
… by jet impingement which cross-over the rib turbulators in the feed chamber. The mid-chord section of the turbine airfoils have serpentine passages connected via. 180° bends, and they feature turbulence promotors which enhance the heat exchange rates between the coolant and the internal walls …
-
Numerical Investigations of a Pipe Jet With Coil Inserts With and Without Crossflow
<p>This dissertation presents a comprehensive numerical study of coil-inserted elevated turbulent jets, aimed at advancing the understanding of passive flow control mechanisms and their effects on both free jet and jet in crossflow (JICF). It provides new insight into the fundamental physics of …
-
Heat Transfer Performance Improvement Technologies for Hot Gas Path Components in Gas Turbines
In the past few decades, the operating temperatures of gas turbine engines have increased significantly with a view towards increasing the overall thermal efficiency and specific power output. As a result of increased turbine inlet temperatures, the hot gas path components downstream of the …