Research And Application Of PIV Technology For Measuring The Flow Field Of Ionic Wind Air Accelerator

Ionic wind air accelerator research is one branch of air corona discharged ionic windtechnology. In recent years, scholars at home and abroad are carrying out a series of basicaltherory and its applied research on how to improve air flow speed and efficiency of ionicwind.The main contents of ionic wind include the impact of ionic wind on ESP collectioneffiency, combustion control and the effiency of enhancing heat transferring.However, theresearch of ionic wind used for ionic flow accelerating started much later. One new kind of gastransmissed infrastructure components based on the ionic wind technology is investigated. Thework principle of ionic wind air accelerator is completely different from the common fan. Itwill open up a new way for the engineering application of ionic wind and provide a newmethod for energy savings and environment protection.The particle image velocimetry (PIV) is an two-dimensional flow non-contacted testingtechnique based on the cross-correlation analysis of the fluid flow images,in recent years, itsapplied range has covered widely. PIV has became a kind of effective means for the researchfield for complex flow field.By analyzing the mechanism of ionic wind, the research reviewsof ionic wind from domestic and foreign is summarized, the principle、model and structure ofionic wind air accelerator is explained;by analysising the study status of ionic wind by meansof PIV technology at home and abroad, the principle of PIV technology is detailed in thethesis. According to the characteristic of flow field on ionic wind air accelerator, the PIVexperimental platform was built and the detailed analysis and verification were done. Theexperimental platform include measuring devices, high voltage power supply、dischargedelectrode and the fluid channel. The characteric of ionic wind velocity in the discharge field andthe regularity distribution is studied by PIV system experimental platform. In the paper, theeffect of tiny change of high voltage power supply and polar distance altering are studied,which provide theoretical ground and experimental base for the research and development forionic wind air accelerating device. In this thesis, the factors of ionic wind accelerator achieving the air flow acceleratingfrom the perspective of studying flow field was studied through the PIV experimental platform;a clear and accurate ionic wind velocity field image was achieved by using PIV particleimaging from the point of view of the characteristics of the flow field. This paper studiesvelocity distribution and flow field properties under different voltage fluctuations (includingamplitude and frequency) and different polar distance. The research results showed that oncondition that without considering the impact of electric field between polars, at both ends of ahigh voltage power supply, small changes of AC component was superposition (includingchanges in its amplitude and frequency), along with changes in flow velocity; under thecondition of voltage parameters invariable, the ionic velocity improved as the distance betweenthe poles decreases subsequently; PIV technology measurements is an effective techniquemethod for the whole flow field measurements. Analyzing the action range and mechanism ofionic wind contributes to acquiring greater wind speed, which has a strong significance on thefollowing-up study.