An experimental study is made to investigate the film cooling performance of imperfect holes due to in-hole blockage over a flat plate. A specifically pyramid-shaped element is used to simulate the in-hole blockage. S...An experimental study is made to investigate the film cooling performance of imperfect holes due to in-hole blockage over a flat plate. A specifically pyramid-shaped element is used to simulate the in-hole blockage. Six in-hole blockage orientations（such as leading-inlet, leading-middle,leading-exit, trailing-inlet, trailing-middle and trailing-exit） and four blocking ratios（ranging from 0.1 to 0.4） are taken into considerations. Based on the experimental results, the influences of in-hole blockage on the film cooling effectiveness and discharge coefficient under typical blowing ratios are analyzed. It is confirmed that the in-hole blockage results in a reduction of discharge coefficient related to the perfect film cooling holes, especially for the leading-exit and trailing-inlet orientations with a big blocking ratio. However, in the view of film cooling effectiveness, the in-hole blockage shows complicated affecting roles. In general, except for the leading-exit orientation, the in-hole blockages produce detrimental influence on the film cooling effectiveness.展开更多
以火电厂常用热电阻PT100为研究对象,采用泓格I-7033温度采集模块、德国Si KA TP17650M检验仪设计了动态试验系统,通过Visial Basic和DCON Utility软件实现了实验数据的自动采集,完成了PT100热电阻的动态特性试验,并使用MATLAB软件对实...以火电厂常用热电阻PT100为研究对象,采用泓格I-7033温度采集模块、德国Si KA TP17650M检验仪设计了动态试验系统,通过Visial Basic和DCON Utility软件实现了实验数据的自动采集,完成了PT100热电阻的动态特性试验,并使用MATLAB软件对实验数据进行了可视化研究,得出了该类型热电阻在不同电阻丝直径、不同插入深度以及不同被测温度下的数学模型,为该类型热电阻在火电厂安装、检修时提供必要的理论基础与实践指导。展开更多
基金the financial support for this project from the National Natural Science Foundation of China (Nos.51276090 and U1508212)
文摘An experimental study is made to investigate the film cooling performance of imperfect holes due to in-hole blockage over a flat plate. A specifically pyramid-shaped element is used to simulate the in-hole blockage. Six in-hole blockage orientations（such as leading-inlet, leading-middle,leading-exit, trailing-inlet, trailing-middle and trailing-exit） and four blocking ratios（ranging from 0.1 to 0.4） are taken into considerations. Based on the experimental results, the influences of in-hole blockage on the film cooling effectiveness and discharge coefficient under typical blowing ratios are analyzed. It is confirmed that the in-hole blockage results in a reduction of discharge coefficient related to the perfect film cooling holes, especially for the leading-exit and trailing-inlet orientations with a big blocking ratio. However, in the view of film cooling effectiveness, the in-hole blockage shows complicated affecting roles. In general, except for the leading-exit orientation, the in-hole blockages produce detrimental influence on the film cooling effectiveness.
文摘以火电厂常用热电阻PT100为研究对象,采用泓格I-7033温度采集模块、德国Si KA TP17650M检验仪设计了动态试验系统,通过Visial Basic和DCON Utility软件实现了实验数据的自动采集,完成了PT100热电阻的动态特性试验,并使用MATLAB软件对实验数据进行了可视化研究,得出了该类型热电阻在不同电阻丝直径、不同插入深度以及不同被测温度下的数学模型,为该类型热电阻在火电厂安装、检修时提供必要的理论基础与实践指导。
