Double Wall Cooling of a Full Coverage Effusion Plate With Cross Flow Supply Cooling and Main Flow Pressure Gradient
| Autor: | Federico Liberatore, Rajeshriben Patel, Zhong Ren, Christopher Allgaier, Sneha Reddy Vanga, Yin-Hsiang Ho, Phil Ligrani, Ram Srinivasan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
020301 aerospace & aeronautics
Materials science Double wall 020209 energy Mechanical Engineering Flow (psychology) Reynolds number Energy Engineering and Power Technology Aerospace Engineering Mechanics Heat transfer coefficient 02 engineering and technology Full coverage 01 natural sciences Coolant 010305 fluids & plasmas symbols.namesake Fuel Technology Effusion 0203 mechanical engineering Nuclear Energy and Engineering 0103 physical sciences 0202 electrical engineering electronic engineering information engineering symbols Pressure gradient |
| Zdroj: | Journal of Engineering for Gas Turbines and Power. 141 |
| ISSN: | 1528-8919 0742-4795 |
| Popis: | Experimentally measured results are presented for different experimental conditions for a test plate with double wall cooling, composed of full-coverage effusion-cooling on the hot side of the plate, and cross-flow cooling on the cold side of the plate. The results presented are different from those from past investigations, because of the addition of a significant mainstream pressure gradient. Main stream flow is provided along a passage with a contraction ratio of 4, given by the ratio upstream flow area, to downstream flow area. With this arrangement, local blowing ratio decreases significantly with streamwise development along the test section, for every value of initial blowing ratio considered, where this initial value is determined at the most upstream row of effusion holes. Experimental data are given for a sparse effusion hole array. The experimental results are provided for mainstream Reynolds numbers of 92,400–96,600, and from 128,400 to 135,000, and initial blowing ratios of 3.3–3.6, 4.4, 5.2, 6.1–6.3, and 7.3–7.4. Results illustrate the effects of blowing ratio for the hot side and the cold side of the effusion plate. Of particular interest are values of line-averaged film cooling effectiveness and line-averaged heat transfer coefficient, which are generally different for contraction ratio of 4, compared to a contraction ratio of 1, because of different amounts and concentrations of effusion coolant near the test surface. In regard to cold-side measurements on the crossflow side of the effusion plate, line-averaged Nusselt numbers for contraction ratio 4 are often less than values for contraction ratio 1, when compared at the same main flow Reynolds number, initial blowing ratio, and streamwise location. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|