Research on the single frame imaging method for measuring multi-parameter fields in flow field

This paper investigateed the application of the Single Frame and Single Exposure Imaging (SFSE)method in the jet flow field and proposed an advanced method———the Single Frame and Multiple Exposure Imaging (SFME)method,which can measure not only the velocity field but also the acceleration field,the force field,the turbulence intensity and stress.In prelim-inary test studies the micron vortex structure of a submerged circular jet was visualized by SFSE method and SFME method with high resolution.The spatial resolution of the measurement rea-ches 1.125μm.Several vortex structures not yet reported were discovered.Experimental results show that the SFSE and SFME methods can get richer parameter information of the micron tur-bulent flow and the vortex flow field than other methods.Compared to other methods for flow field measurement,this method has the advantages of simple device,high spatial resolution,low requirements on the experimental conditions,intuitive display of the parameter information and suitability for measuring microscopic flow field.