CFD as a design tool for small aircraft: Saras propeller aerodynamics: 1

Josy, Pullockara P (2009) CFD as a design tool for small aircraft: Saras propeller aerodynamics: 1. Technical Report. NAL.

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Abstract

Saras is an indigenously developed multi-purpose civilian aircraft in the Light Transport Aircraft category designed by the National Aerospace Laboratories (NAL). Saras is powered by twin turbo-prop engines and the five bladed propeller is positioned in a pusher configuration. In this context, this work is carried out to obtain computational estimates of thrust produced and power absorbed by the propeller in their un-installed condition. A validation case based on NACA report 640 along with the Saras-PT1:Hartzell propeller and Saras-PT2:MT propeller were analysed for different blade pitch angle ()3) settings and advance ratios (J) in an automated UNIX/GNU environment using CFD-ACE+ softwares. It was noticed that the CFD analyses resulted in results that were '7-- 1° of 0 lower than the experimental data for the validation case, while a difference of ;z:~ 2° - 50 was noted for the Hartzell and MT propellers. Also, the blade twisting moment and propeller windmilling torque purely by aerodynamics is estimated for the Saras-PT2:MT propeller and the windmilling dynamics are obtained by numerical integration from the computed aerodynamic torques. It was computed that if /3 is restricted to (11°, 80°), 100% RPM is archivable in windmilling. Further if blade pitch inertia is assumed 500 kg. M2 then 100% RPM in windmilling is attained in 15 s which is observed in Saras-PT2 flight-49.

Item Type: Proj.Doc/Technical Report (Technical Report)
Uncontrolled Keywords: SARAS,Pusher,Turboprop,Propeller,CFD,Unstructured,Navier-Stokes,Pitch,Circular tip mach number,Freesteam mach number,Advanced ratio,Thrust produced,power obsorbed,Efficiency,Parametric,Feather,windmill,Dynamics
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
Division/Department: Computational and Theoretical Fluid Dynamics Division
Depositing User: Mr. Guest NAL
Date Deposited: 27 Jul 2010 12:30
Last Modified: 27 Jul 2010 12:30
URI: http://nal-ir.nal.res.in/id/eprint/8783

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