High Speed Hydrogen Jets: Stability and Instability (Keynote Paper)

High speed hydrogen jets have been used in many technological fields such as chemical industries, automotive industries, etc. and gradually become important recently since fuel cell technology will become popular and its safety problem such as high pressure hydrogen tank leakage must be cleared and solved by the time of its use. In this paper the stability and instability of high speed hydrogen jet flames and their control are focused on. First of all nature of high speed hydrogen diffusion jet flames are shown experimentally to discuss their instability problems. Secondly numerical analysis of high speed jet flame is shown to explain the details of jet instability with heat releases. Then thirdly as an application a control of high speed hydrogen lifted jet flame is discussed experimentally and numerically.