Ｃｏｍｐｕｔｅｄ Ｔｏｍｏｇｒａｐｈｙ法による噴霧粒子群の内部構造の可視化の研究

Abstract

It is very important to know the informations of spray structure on a research and development of combustion systems such as industrial boiler, power plants and internal combustion engine, but it is too difficult to get their characteristics, because an excelent measuring methods have not been developed.In order to get the information of internal spray structure such as spray concentration, a computed tomography (CT) technique was introduced. CT method is familiar with medical diagnostics.In this paper, we discussed about following some basic factors;(1) Algorism of Computed Tomography(2) Filter function(3) Minimum number of projection and sampling data(4) Application to visualization of spray structureFrom these discussions, Convolution method was used as reconstruction procedure, modified Shepp and Logan's function was adopted as filter function and a minimum number of oroiection and samplinv was decided as 61 and 30, respectively.Experimental studies were made by using a visible light as a light source and an Industrial Television Camera as a detector of a transmitted light intensity, and a micro processor was used for a calculation of reconstruction of images.Appling to a reconstruction of picture of a hollow cone spray atomizer and a fan spray atomizer, reasonable reconstruction data were obtained and this CT method would be useful to study the internal structure of various spray such as vaporizing or combusting process.