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米国际.动叶多腔内通道换热特性实验研究与数值模拟[J].实验力学,2018,33(5):823~830
动叶多腔内通道换热特性实验研究与数值模拟
Experimental study and numerical simulation of heat transfer characteristics of rotating blade multi-cavity channel
投稿时间: 2017-09-08  最后修改时间: 2017-10-31
DOI:10.7520/1001-4888-17-183
中文关键词:  动叶多腔通道  对流传热  旋转数  瞬态液晶  数值模拟
英文关键词:multi-cavity channel of rotating blade  convection heat transfer  rotation number  transient liquid crystal  numerical simulation
基金项目:陕西省工业科技攻关项目(项目编号:2016GY-157); 国家自然科学基金项目(项目编号:51575420); 陕西省教育厅服务地方专项计划项目(项目编号:14JF011)
作者单位
米国际 西安航空学院, 陕西西安 710077 
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中文摘要:
      为掌握某型燃气涡轮动叶内部多腔通道的换热分布特性,建立了动叶内腔多段连接通道换热实验系统。借助成熟的瞬态液晶测量方法,研究多腔内通道放大模型在旋转状态下的全表面换热机理。通过三维数值模拟方法分析旋转作用力对腔道换热特性的影响因素。结果表明:多段连接和转弯连接是造成上、下游通道内的流体沿流偏移的主要因素,旋转作用增强了转弯流场偏移换热分布不均的效果;哥氏力、离心力叠加作用造成径向流体在肋间扰流附着区域变化,从而改变旋转多腔通道壁面换热分布偏移;径向带肋通道壁面沿程平均换热系数呈波状分布,换热系数沿流向逐渐减小;旋转哥氏力使多腔转弯连接区域高换热区域向肋的背风面偏移。
英文摘要:
      In order to understand the heat transfer distribution characteristics of rotating blade internal multi-cavity channel of a certain type of gas turbine, an experimental system for heat transfer of multi-segment connecting channels in rotating blade inner cavity was established. With the help of mature transient liquid crystal measurement method, all-surface heat transfer mechanism of multi-cavity channel enlargement model in rotating state was experimentally studied. The influence factors of rotation force on heat transfer characteristics of cavity channel were analyzed based on three-dimensional numerical simulation. Results show that the multi-segment connection and turn connection are the main factors that cause the fluid along upstream and downstream offset in the channels, and the rotation effect enhances the uneven distribution of heat transfer due to the turning flow field deviation. The superposition of Coriolis force and centrifugal force causes the radial fluid to change in the intercostal attachment zone, thus changing the wall heat transfer distribution of rotating multi-cavity channel. On the wall of radial rib channel, the average heat transfer coefficient presents a wavy distribution. The heat transfer coefficient gradually decreases along the flow direction. The rotation of Coriolis force deflects the high heat transfer region of the multi-cavity turning connection to the leeward surface of rib.
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