摘要
Linear cascade testing plays an important role in the research and development of turbomachinery and is widely used over the world.The ideal cascade model of a turbomachinery blade row is two-dimensional.In actual linear cascade testing,the flow through the test section converges due to the development of the boundary layer and secondary flow along the sidewall surfaces of the test section.Axial velocity density ratio(AVDR) is adopted to account for the deviation of the tested cascade flow from the ideal 2D model.Among numerous published cascade works,the influence of AVDR on cascade performance is seen to be complicated with many affecting factors,such as those related to cascade/blade geometry and flow conditions.Also,controlling AVDR is limited by the facility capability.Furthermore,real blade-to-blade flow in turbomachines is usually associated with AVDR greater than unity due to limited span of blades between the hub and shroud such that cascade testing without reducing AVDR could be favored sometimes.All these facets add complexity and diversification to the matter.The current paper reviews previous studies and results on AVDR.Consolidated understanding on the role of AVDR and recommendations on how to deal with it in linear cascade testing are provided.
Linear cascade testing plays an important role in the research and development of turbomachinery and is widely used over the world. The ideal cascade model of a turbomachinery blade row is two-dimensional. In actual linear cascade testing, the flow through the test section converges due to the development of the boundary layer and secondary flow along the sidewall surfaces of the test section. Axial velocity density ratio （AVDR） is adopted to account for the deviation of the tested cascade flow from the ideal 2D model. Among numerous published cascade works, the influence of AVDR on cascade performance is seen to be complicated with many affecting factors, such as those related to cascade/blade geometry and flow conditions. Also, controlling AVDR is limited by the facility capability. Furthermore, real blade-to-blade flow in turbomachines is usually associated with AVDR greater than unity due to limited span of blades between the hub and shroud such that cascade testing without reducing AVDR could be favored sometimes. All these facets add complexity and diversification to the matter. The current paper reviews previous studies and results on AVDR. Consolidated understanding on the role of AVDR and recommendations on how to deal with it in linear cascade testing are provided.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2007年第6期933-944,共12页
Journal of Aerospace Power
关键词
线性叶栅试验
轴向速度密度比
空气流动
叶栅特性
axial velocity density ratio（AVDR）
linear cascade testing
cascade performance
sidewall air re moval
