PIV Studies in Under Expanded Supersonic Jets

Venkatakrishnan, L and Mathur, NB (2006) PIV Studies in Under Expanded Supersonic Jets. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

This report details the first successful implementation and validation of 2D PIV on a single and twin supersonic jet configuration in the country at the Base Flow facility at NAL. A modified Wright nebulizer was designed for generating very small particles (approx 0.5-0.6 m) which is sufficient to follow the flow with fidelity. Measurements were carried out in the central plane of axisymmetric jet having a sonic nozzle at ideal conditions and a nozzle pressure ratio of 8. The flow-field was imaged over a distance of 6.5D. Validation of the results against Pitot probe measurements for the ideally expanded case showed good agreement proving that the supersonic flows with shocks can be captured effectively by PIV with seeding generated from a Wright nebulizer. The flow field of interacting over-expanded supersonic twin jets was also carried out using PIV revealing movement of the first shock cell caused by the hydrodynamic field of the interacting jets. The data also showed that the presence of the second jet has an inhibiting effect on the entrainment in between the jets as seen from the lowered radial velocities.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Particle Image Velocimetry, Underexpanded jet, Supersonic flow
Subjects: AERONAUTICS > Aerodynamics
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 29 Aug 2011 04:58
Last Modified: 29 Aug 2011 04:58
URI: http://nal-ir.nal.res.in/id/eprint/9938

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