期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Internal Flow Field Measurement of Gas Turbine Based on Optical Flow Method
1
作者 Chengyang Li 《Journal of Applied Mathematics and Physics》 2022年第6期1910-1917,共8页
The in-cylinder flow field of the internal combustion engine is an important factor affecting the quality and combustion quality of the fuel mixture in the cylinder. In order to calculate the high-precision flow field... The in-cylinder flow field of the internal combustion engine is an important factor affecting the quality and combustion quality of the fuel mixture in the cylinder. In order to calculate the high-precision flow field, the paper presents a flow field calculation method based on the optical flow algorithm. The motion of the point was calculated using the change in pixel intensity within two temporally adjacent frame images. The results show the high accuracy and resolution of the flow field at small displacement conditions. 展开更多
关键词 Optical flow Method Particle Image Velocity Measurement flow field calculation
下载PDF
Inlet Recirculation Influence to the Flow Structure of Centrifugal Impeller 被引量:10
2
作者 YANG Ce CHEN Shan +2 位作者 LI Du YANG Changmao WANG Yidi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2010年第5期647-654,共8页
Inlet recirculation is proved as an effective way for centrifugal compressor surge margin extension,and is successively used in some engineering applications.Unfortunately its working mechanism is still not being well... Inlet recirculation is proved as an effective way for centrifugal compressor surge margin extension,and is successively used in some engineering applications.Unfortunately its working mechanism is still not being well understood,which leads to redesigning of inlet recirculation mostly by experience.Also,most study about inlet recirculation is steady to date.It is necessary to study surge margin extension mechanism about inlet recirculation.To expose the mechanism in detail,steady and unsteady numerical simulations were performed on a centrifugal compressor with and without inlet recirculation.The results showed that,with inlet recirculation,the inlet axial velocity is augmented,relative Mach number around blade tip leading edge area is significantly reduced and so is the flow angle.As the flow angle decreased,the incidence angle reduced which greatly improves the flow field inside the impeller.Moreover,inlet recirculation changes the blade loading around blade tip and restrains the flow separation on the blade suction side at the leading edge area.The unsteady results of static pressure around blade surface,entropy at inlet crossflow section and vorticity distributions at near tip span surface indicated that,at near stall condition,strong fluctuation exists in the vicinity of tip area due to the interaction between tip leakage flow and core flow.By inlet recirculation these strong flow fluctuations are eliminated so the flow stability is greatly enhanced.All these improvements mentioned above are the reason for inlet recirculation delays compressor stall.This research reveals the surge margin extension reason of inlet recirculation from an unsteady flow viewpoint and provides important reference for inlet recirculation structure design. 展开更多
关键词 centrifugal compressor inlet recirculation flow field calculation flow structure UNSTEADY
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部