The relevance of research is conditioned by the need to involve lowgrade highash coals in the fuel and raw materials base due to the limited reserves of highquality fuel. For their effective and environmentally safe use, it is necessary to develop new and modernize exi sting boiler units with preliminary physical and numerical modeling. The aim of this work is an experimental study of the pulsation characteristics of a turbulent swirled flow in the model of a perspective combustion device using a fourvortex combustion scheme for pulverizedcoal fuel. The object of the research is an isothermal laboratory model of the fourvortex furnace made of optically transparent Plexiglas for measurements within the framework of modern noncontact methods for flow diagnostics. Research methods: physical laboratory modeling of aerodynamics and transport processes in the fourvortex furnace; noncontact stu dy of averaged and pulsation characteristics in the furnace volume at different operating parameters; study of pressure pulsations using a condenser microphone. Results. Using the method of particle image velocimetry the authors have obtained the distributions of the averaged and pulsation cha racteristics of the flow velocity in a number of sections of the model over a wide range of regime parameters. The authors determined the location of the areas with high values of turbulent pulsations and stagnant zones, and identified its features depending on the regi mes. Information on the pressure pulsations in the localities of the model volume was obtained with the use of a condenser microphone. Analysis of spectral characteristics with applying the Fourier transform to the obtained data shown that there are no nonstationary pe riodic oscillations due to the vortex core precession in the studied model. The measured pressure pulsations are caused by acoustics, and velocity pulsations are random and are not associated with the dynamics of coherent structures.
|Number of pages||8|
|Journal||Bulletin of the Tomsk Polytechnic University, Geo Assets Engineering|
|Publication status||Published - 1 Jan 2018|
- Fourvortex furnace
- Particle image velocimetry.
- Spectral characteristics
- Transport processes
- Turbulent pulsations
ASJC Scopus subject areas
- Materials Science (miscellaneous)
- Fuel Technology
- Geotechnical Engineering and Engineering Geology
- Waste Management and Disposal
- Economic Geology
- Management, Monitoring, Policy and Law