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首页> 美国政府科技报告 >Heat Transfer, Adiabatic Effectiveness and Injectant Distributions Downstream of Single and Double Rows of Film-Cooling Holes with Simple and Compound Angles.
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Heat Transfer, Adiabatic Effectiveness and Injectant Distributions Downstream of Single and Double Rows of Film-Cooling Holes with Simple and Compound Angles.

机译：具有简单和复合角度的薄膜冷却孔的单排和双排下游的传热，绝热效率和喷射器分布。

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摘要

Experimental results are presented which describe the development and structure of flow downstream of single and double rows of film cooling holes with both simple and compound angle orientations. Two configurations are investigated, a simple angle injection system in which the injectant is introduced into the freestream parallel to the main flow (as viewed in streamwise/spanwise planes), and a compound angle injection system in which the injectant is introduced with spanwise velocity components. Results indicate that effectiveness depends mostly on four parameters: simple or compound angle injection, spanwise hole spacing, one or two rows of holes, and blowing ratio. In general, for a given m, for all the configurations tested, effectiveness is greatest at low x/d values, and decreases with increasing x/d. As blowing ratio increases, effectiveness generally decreases, particularly at low x/d values because of lift-off effects. Iso-energetic Stanton number ratios vary between 1.0 and 1.25 for all cases, and generally increase with increasing blowing ratio at any given x/d. Effectiveness values measured downstream of two rows of holes are higher than values measured downstream of one row of holes. Adiabatic film-cooling effectiveness data for both the compound angle injection system and the simple angle injection collapse with minimal scatter in n/m vs xI/s coordinates.

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