Lecture PPTs (26) - Lect 30 1 Lect 30 Axial Flow Turbine...

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1 Lect - 30
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2 Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay Lect - 30 Axial Flow Turbine 3-D blade design
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3 Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay Lect - 30 Design Steps : Design steps in brief are Selection of parameters Design at mean diameter, Dm Radial variation of parameters Profiling of stator and rotor blades
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4 Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay Lect - 30 1. Design at Dm a) Parameters to be selected from the preliminary cycle ( thermodynamic) calculations are: (@ flt velocity & altitude), T g , g , P a , T a at design point and the engine parameters = 0.88 – 0.90 for one stage = 0.91 – 0.94 for each stage for multi-stage b) Parameters selected from compressor-turbine matching are: Exit U mean , D mean , D tip , or M 2 [ λ is a total temperature based critical speed ratio, λ =V/a cr ] and, All these should lead to a work distribution, and number of stages Z. * * * g T T P , π ,P * T η 2 d , λ , T i H H z 1 = g 0i = γ RT a cr r
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