Simultaneous Measurement Of Temperature And Velocity Distributions In Combustion Flow Field

The latest research hotspots and development frontiers in fields of combustion diagnosis and flow display have been extended to new methods for combustion flow fields,and the new methods should simultaneously meet the needs of non-intrusive,multi-parameter simultaneous measurement,quantitative calculation,and multi-dimensional visualization.Based on optical deflection tomography and Particle Image Velocimetry(PIV),single-beam jet combustion system and multi-optical path swirl combustion system are designed and constructed.The key components of tracer particle generators and swirl burners are invented and manufactured.The effect of particle motion on the simultaneous measurement of multi-parameter combustion is explored.Based on the principle of light deflection CT sampling,jet combustion flames and light deflected moire fringe images can be obtained simultaneously.The light deflection projection information is extracted by using image processing technique which was based on wavefront recovery.Multi-section combustion temperature distribution is contributed to using inversion algorithm,and then use visualization technology to achieve three-dimensional display of the jet combustion temperature field.Based on the principle of Particle Image Velocimetry,particle field distribution and flame pattern of jet combustion flow field are acquired at the same time.Using PIV System Software,velocity vectors for cross-section combustion flow fields is calculated.The displays of velocity cloud map,streamline diagram,which are related to the combustion flow field,are realized by using data processing.The experimental results show that when fuel is constant,flame height descends with the increase of particle concentration on the air side,and at a certain extent the oscillation occurs,the combustion changes from steady state to non-steady state transition.The quality of moiré fringe image begins to decrease with increase of particle concentration,the fringe begins to blur,when the fringe is extracted,and the adhesion phenomenon appears.When particle concentration is too low,the problems of local defects appear in images of PIV.The entraining effect on fuel side is limited to particle concentration distribution in flame combustion zone.It is necessary to install a particle generator or a swirling vane on the fuel side to increase flame internal particle concentration.By means of pixel registration,the matching of temperature field and velocity field of combustion field is achieved.The methods and technical results of this paper will help improving combustion reaction mechanism,designing and optimizing new combustion devices,and developing combustion monitoring and control strategies.It is expected to have broad application prospects in energy,power,environment,information and other fields.