On the assessment of quot;Correctabilityquot; of data in two-dimensional transonic wind tunnel tests

Singh, JP and Rangarajan, R and Desai, SS (1988) On the assessment of quot;Correctabilityquot; of data in two-dimensional transonic wind tunnel tests. Technical Report. National Aeronautical Laboratory, Bangalor, India.

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    Abstract

    The lift and blockage interference in the wind tunnel testing, specially in the transonic flow regime is a very well known problem. If proper care is taken in configuring the test section, the interference effects can be minimised or suitable corrections can be applied to the results to simulate the effective flow condition. However, if care is not taken to configure the test section properly, the simulated flow would not be amenable for standard wind tunnel interference corrections. Computational techniques can be effectively used to assess whether the two dimensional transonic results are reliable. The. experience with computations corresponding to the experiments done on airfoilsin the O.3m wind tunnel at NAL under different flow conditions due to different open area ratios (OAR) clearly demonstrates that the resul ts obtained using 2.5% OAR are correctable, whereas the resultswith 8% OAR are not correctable. This technique leads to the conclusionthat the flow in test sectionwith 8% OAR is severely distortedwhereas the results with 2.5% OAR are reasonably interference freeunder subcritical conditions and are correctable under transonic conditions.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Transonic flows;Wind tunnel interference;Computation of transonic flows
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Aerodynamics, Aerodynamics, Aerodynamics
    Depositing User: Poornima Narayana
    Date Deposited: 09 Aug 2006
    Last Modified: 24 May 2010 09:45
    URI: http://nal-ir.nal.res.in/id/eprint/2048

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