主  办：爆炸科学与技术国家重点实验室

         安全与防护协同创新中心

报告题目：Premixed flame acceleration and deflagration-to-detonation transition

报告人： Assoc.Prof. Damir Valiev

        Tsinghua University, Beijing

时间：2018年9月7日上午9:00

地点：北京理工大学3号教学楼146会议室

报告人简介：

Damir Valiev obtained his PhD from the Royal Institute of Technology (KTH), Sweden, in 2008. Subsequently, he held postdoc and research engineer positions at Umeå University, Sweden, and at Princeton University, USA, also working as a long-term visitor at Sandia National Laboratories, Livermore, USA. In 2016, he joined the Center for Combustion Energy and the Department of Energy and Power Engineering at Tsinghua University, as an associate professor. He is a recipient of Thousand Young Talents Plan award. His research interests include modelling and numerical simulation of combustion, high performance computing, dynamics of premixed flames, deflagration-to-detonation transition.

报告摘要：

In the present talk we will discuss certain aspects of flame acceleration, subsonic and supersonic combustion in channels, and deflagration-to-detonation transition (DDT). At certain conditions a slow flame may spontaneously accelerate to near-sonic or supersonic speed and trigger detonation; this process is called DDT. In spite of extreme fundamental and technological importance, spontaneous flame acceleration and DDT remaines, probably, one of the least understood processes in combustion science.

Several groups of researchers developed quantitative theory and performed simulations of laminar flame acceleration and DDT in smooth tubes. It was found that the flame accelerates exponentially at the initial quasi-incompressible stage of the process. Subsequent experiments on DDT in micro-channels with diameter about 1 mm demonstrated DDT in micro-channels in agreement with the theory. The current advances in understanding of DDT may open new technological possibilities for using DDT in micro-scale combustion energy devices, which is a rapidly growing area of research and development nowadays. DDT also stands behind many disasters like mining accidents and explosions in power plants. Reducing the risk of unwanted DDT is a goal of primary importance for energy safety.