Journal of Dalian Maritime University >
2017 , Vol. 43 >Issue 4: 67 - 73
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2017.04.010
Flow fields in a annular cascade with non-axisymmetric endwall at different exit Mach numbers
Received date: 2017-04-28
Revised date: 2017-06-12
Online published: 2017-06-13
Taking a high pressure turbine guide blade sector cascade as the research object, numerical and experimental methods were used to study the control mechanism of the non-axisymmetric endwall to the secondary flow in the cascade, and the influence of the increase of exit Mach number on the characteristics of secondary flow loss was analyzed. Research results show that the non-axisymmetric endwall can effectively affect the tangential secondary flow and the development of the passage vortices, resulting in the decrease of the total pressure loss and the change of the exit flow angles. The total pressure loss and the vorticity change with the exit Mach number, and the total pressure loss in the annular cascade with non-axisymmetric endwall reduces by 10.81% when the exit Mach number is 0.85.
Key words： turbine; non-axisymmetric endwall; Mach number; sector cascade; secondary flow
ZHONG Jing-jun , WANG Wei-wei , HU Shu-zhen . Flow fields in a annular cascade with non-axisymmetric endwall at different exit Mach numbers[J]. Journal of Dalian Maritime University, 2017 , 43(4) : 67 -73 . DOI: 10.16411/j.cnki.issn1006-7736.2017.04.010
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