WIT Press


A BIOMIMETIC STUDY OF THE EXPLOSIVE DISCHARGE OF THE BOMBARDIER BEETLE



Price

Free (open access)

Paper DOI

10.2495/D&N-V1-N1-61-69

Volume

Volume 1 (2006), Issue 1

Pages

8

Page Range

61 - 69

Author(s)

N. BEHESHTI & A.C. MCINTOSH

Abstract

A biomimetic study of the bombardier beetle’s explosive discharge apparatus was undertaken using numerical (CFD) modelling, first, of the beetle’s combustion chamber, and then of a scaled-up combustion chamber with a view to its application to devices such as gas turbine relighters. The new findings about the existence of a pressure release valve at the beetle’s combustion chamber exit yield a clearer understanding of the physics of the beetle’s mass ejection mechanism. The scaled-up chamber (about 1cm in length) is modelled by considering the chamber to be filled with liquid hexane which then undergoes vapour explosion through a pressure release valve at the exit. The ejection of vaporised fuel at high exit velocities has a number of applications, including gas turbine igniters.

Keywords

biomimetics, bombardier beetle, gas turbine relight, plasma injector, vapour explosion