Experimental Evaluation of Linear Plug Nozzle Flow-field

Verma, SB and Viji, M (2009) Experimental Evaluation of Linear Plug Nozzle Flow-field. Project Report. National Aerospace Laboratories, Bangalore.

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    Abstract

    This document reports the experimental results of the flow development processes in linear-plug nozzles in the base flow facility at NAL. Two configurations, namely full-length spike and 40% plug, were chosen. Further the effect of different freestream conditions was studied by estimating the nozzle performance. Under static tests, the performance of the full-length spike nozzle shows a reduction of 5-6% relative to the ideal nozzle. In the presence of freestream conditions, the performance drops further by 1-2%. Truncating the full-length spike to 40% length reduces the performance by another 4-5%. Under "closed-wake" conditions, the performance of 40% plug drops by another 3%. It is suggested that (i) the internal nozzle axis by inclined towards the plug surface, (ii) the plug surface be appropriately contoured for enhanced altitude compensating characteristics and, (iii) adding an appropriate base-bleed system to improve the base thrust contribution to overall nozzle performance. The benefits of such a study can go in improving the payload capacity of the launch vehicle or RLV.

    Item Type: Proj.Doc/Technical Report (Project Report)
    Uncontrolled Keywords: Linear spike nozzle, Thrust coefficient, Open-wake regime, Closed-wake regime, Flow unsteadiness
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Experimental Aerodynamics Division, Experimental Aerodynamics Division
    Depositing User: Smt Bhagya Rekha KA
    Date Deposited: 11 Aug 2011 16:06
    Last Modified: 11 Aug 2011 16:06
    URI: http://nal-ir.nal.res.in/id/eprint/9861

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