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首页> 外文期刊>Technical Gazette >Numerical Investigation of Flow and Heat Transfer Characteristics in Plate with Multiple Incline Stage Holes
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Numerical Investigation of Flow and Heat Transfer Characteristics in Plate with Multiple Incline Stage Holes

机译：具有多个倾斜阶段孔的板流量和传热特性的数值研究

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In this paper, the effects of impingement and film composite cooling on the design of combustion chamber cooling structure are simulated by numerical simulation. The focus of the investigation was on increased film cooling efficiency and enhanced heat transfer between the coolant and the hole wall. The five-stage shaped hole model and one cylindrical hole design have the same equivalent flow area. The flow and heat transfer characteristics of cylindrical hole and stage-shaped hole were numerically investigated under same blowing ratio, and compared at the same blowing ratio. The results showed the stage-shaped hole resulted in higher cooling effectiveness, especially in rear part, and the mechanisms of which were studied in details. The consequences of the phase parameters in the flow have very clearly dependedt on the internal shape of the corresponding hole. Stage-shaped holes formed impact inside the wall, tapped the coolant potential in cooling, and increased the heat transfer inside the solid wall. Further, stage-shaped hole resulted in unstabilized flow inside hole, gave an enhancement of lateral spreading ability, and brought a significant increase of the film lateral effectiveness. Further, the affection of area ratio and height ratio has been studied by five models. The results show that the increasing of area ratio leads to an increase in cooling efficiency, which also indicates the increasing of height ratio showed slight affection.
机译：本文通过数值模拟模拟了冲击和薄膜复合冷却对燃烧室冷却结构设计的影响。调查的重点是薄膜冷却效率提高，加工在冷却剂和孔壁之间的热传递增强。五级形状孔模型和一个圆柱形孔设计具有相同的等效流量面积。在相同的吹气比下进行数值研究圆柱孔和级孔的流动和传热特性，并以相同的吹长比进行比较。结果表明，舞台形孔导致更高的冷却效果，特别是在后部，以及详细研究的机制。流动中相位参数的后果非常清楚地依赖于相应孔的内部形状。舞台形孔在墙壁内部形成撞击，敲击冷却剂的冷却剂电位，并增加了固体壁内的传热。此外，阶段形孔导致未肥化的流动内孔，提高了横向扩散能力，并提高了薄膜横向效率的显着增加。此外，五种模型研究了面积比和高度比的影响。结果表明，面积比的增加导致冷却效率的增加，这也表明高度比率的增加表现出轻微的感情。

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