Experimental study on the conjugate heat transfer of double-wall turbine blade components with/without pins
| Autor: | H. Wei, Y. Chen, Y.Q. Zu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Convective heat transfer Turbine blade 020209 energy Drop (liquid) 02 engineering and technology Thermal conduction Curvature 01 natural sciences Discharge coefficient 010305 fluids & plasmas law.invention Thermal conductivity law 0103 physical sciences Heat transfer 0202 electrical engineering electronic engineering information engineering Composite material |
| Zdroj: | Thermal Science and Engineering Progress. 8:448-456 |
| ISSN: | 2451-9049 |
| DOI: | 10.1016/j.tsep.2018.09.010 |
| Popis: | The heat transfer and flow characteristics of double-wall turbine blade components with integrated impingement/effusion and impingement/pin/effusion cooling configurations are investigated experimentally. The measurements are conducted on layers of parallel flat plates, neglecting surface curvature effect, as an idealization of the actual turbine blade component. Non-dimensional aerodynamic and geometric parameters, excluding surface curvature, considered in the study are consistent with a typical double-wall structure of the turbine blade. The test plates are made of 304 stainless steel with a thermal conductivity of approximate 17 W/mK. The injection angle of effusion holes (α) is set at 30°, 45° and 60°, and blowing ratio (BR) changes within a range of BR = 0.25–1.0. Overall cooling effectiveness of the double-wall structure, taking convective heat transfer as well as the conduction effect into consideration, is measured using thermochromic liquid crystal technology. Effects of injection angle, blowing ratio and pin installations on the overall cooling performance and discharge coefficient of the double-wall structure are examined and analyzed. The test results show that overall cooling effectiveness is enhanced significantly as BR increases from 0.25 to 0.5, but changes little, up to 5.9% in limited regions, for BR ranging from 0.5 to 1.0. As the α increases, the double-wall cooling efficiency is reduced upstream, but is meanwhile enhanced downstream. Adding an array of cylindrical pins to the internal cooling structure leads to a considerable enhancement in the overall cooling effectiveness, while it causes the discharge coefficient to drop, to some extent. |
| Databáze: | OpenAIRE |
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