Time Evolution of the Density Field of a Micro–Explosion Using Background Oriented Schlieren

Suriyanarayanan, P and Venkatakrishnan, L and Jagadeesh, G (2013) Time Evolution of the Density Field of a Micro–Explosion Using Background Oriented Schlieren. In: International Symposium on shock waves, 14 Jul 2013, University of Wisconsin-Madison, USA.

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Abstract

Determination of shock wave propagation properties from explosions using available flow diagnostic techniques are difficult. The non-isentropic nature of the flow implies that properties like over pressure, density and velocity have to be measured independently. Further, the variation of the flow field in both spatial and temporal coordinates causes severe limitations on the technique applied. Recent efforts at documenting this flow using conventional schlieren and comparison with numerical simulation show the complexity of the flow which shows a modified precursor kind of flow behaviour. Efforts to quantify the velocity flow field are hampered by the difficulty in seeding such flows. The Background oriented schlieren (BOS) offers a non-intrusive measurement way to quantitatively capture the density field. Earlier attempst with BOS succeded in capturing the instantaneous density field measurement results at discrete time instants. However, this does not allow a full description of the time evolution of the flow. This study attempt to carry out BOS measurements using a high speed camera running at 100000 frames/sec. This implies a that the density field would be available after every 5mm (approx.) of movement.

Item Type: Conference or Workshop Item (Paper)
Subjects: ENGINEERING > Engineering (General)
Depositing User: Mrs SK Pratibha
Date Deposited: 19 Jun 2015 04:25
Last Modified: 19 Jun 2015 04:25
URI: http://nal-ir.nal.res.in/id/eprint/12169

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