Research On The Features Of Particle Tracers And Experimental Technique Of Laser Particle Image Measurement

Laser particle image measurement is the key technique of aerodynamics and combustion. For the complexity of the flow, many problems can't be solved simply based on theory. The research achievements attribute to the comprehension and elaborate observation of the complicated flow mechanism, relying on the improved design research as well as the development of the experimental technique.Laser particle image measurement has been developing in recent ten years or so. It indicates the importance of laser technique, image processing technique, computer science and modern optical technology. Research on the technique becomes an effortful way to achieve the ideal measure approach. This paper emphasizes the representative DPIV technique among laser particle image measurement techniques in respect of particle tracers, and focuses on its measuring problem in the high speed and complicated flow field. The content and innovation are as follows:I. Researching on the scattering and following features of scattered particle tracers; providing theoretical fundamental for the selection of the particle tracers in the DPIV experiments of the high speed and complicated flow field.II. Applying the dimensional analysis to the research of the following features of particle tracers; automatically deducing nondimensional mathematic expression of the following-featured function; in order to systematize and simplify the analysis of the following features of the particle in laser particle image measurement.III. Proposing an effective way of choosing particle parameter to improve the measurement accuracy in laser particle image measurement, concerning to the numerical analysis of typical flow field, particularly the following features of the particle in turbulent.IV. Putting forward a new DPIV system based on the multi-wavelength laser pulse, which is promising to break through the measurable current velocity extreme and solve some key problems such as the declining measurement accuracy or invalid measurement caused by the steep gradient of the flow rate in the complicated flow field measurement.