ON LOSS MECHANISM THROUGH REACTION TURBINE CASCADE: EFFECT OF SPACE-CHORD RATIO | ||||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||||
| Article 65, Volume 15, 15th International Conference on Applied Mechanics and Mechanical Engineering., May 2012, Page 1-15 PDF (1.05 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/amme.2012.37014 | ||||
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| Authors | ||||
| M. Govardhan1; V. V. Anandrao2 | ||||
| 1Professor, Dept. of Mech. Eng., I.I.T. Madras, Chennai, India. | ||||
| 2Graduate Student, Dept. of Mech. Eng., I.I.T. Madras, Chennai, India. | ||||
| Abstract | ||||
| ABSTRACT Investigations on reaction turbine cascade were conducted with the aim of ascertaining the influence of space-chord ratio on secondary flows and losses. The turbine cascade had high deflection reaction blades with a geometric deflection of 820. Structured hexahedral elements were used for meshing. Periodic boundary condition for periodic faces and no slip boundary condition for endwall, blade surfaces were applied. Experimental inlet profile was specified and the SST K- turbulence with transition was used for closure. Five space-chord ratios; namely, S/Ch = 0.42, 0.60, 0.70, 0.84 and 1.04 were varied at constant stagger and incidence angles. Space-chord ratio alters blade loading influencing secondary flows characteristics. As space-chord ratio is increased, secondary loss coefficient increases primarily due to the increased blade loading resulting in increased cross channel deflection. Space-chord ratio influences loss levels. There exists an optimum space-chord ratio at which total pressure losses are minimum. | ||||
| Keywords | ||||
| space-chord ratio; Secondary losses; static presure coefficient; passage vortex; flow angle; deviation | ||||
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