Journal of Thermal Science and Technology
Online ISSN : 1880-5566
ISSN-L : 1880-5566
Short Paper
Effects of each operating condition on the maximum pressure in an imploding detonation apparatus with a pre-combustion chamber
Yohichi UDAGAWAMinoru SUZUKI
Author information
JOURNAL FREE ACCESS

2015 Volume 10 Issue 1 Pages JTST0010

Details
Abstract

Imploding detonations can generate ultra-high pressures at their implosion centers. In this basic study, we measured the maximum pressure in an imploding detonation apparatus with a pre-combustion chamber. The aim was to investigate such ultra-high pressure states for industrial use; namely, as a microorganism treatment technique driven by underwater shock waves. The experimental apparatus is fitted with an exchangeable nozzle for altering the minimum converging radial distance. The variable experimental conditions are the inner diameter of the nozzle, the initial pressure, the equivalence ratio, and the concentration of the nitrogen diluent. We found that the maximum pressure increased with increasing inner diameter of the nozzle, because the duration time of the flame passing the nozzle increased. The maximum pressure was also an increasing function of the initial pressure and the equivalence ratio. High pressure was maintained up to nitrogen concentrations of approximately 65%. This result was attributed to detonation of the overdriven state and reduced propagation speed of the flame.

Content from these authors
© 2015 by The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan
Previous article Next article
feedback
Top