抄録
In the safety analysis of the High Temperature Gas-cooled Reactor, it is important to investigate the density stratified flow field caused by air ingress into top cover filled with helium after primary tube rupture. Three-dimensional density distribution can be reconstructed using tomography technique from interferogram images. Conventional tomography techniques have low accuracy with a few interferogram images. To improve the accuracy of the reconstruction, a new tomography technique is proposed. In the present method, density distribution is assumed to be mainly effected by diffusion processes, and to be expressed as the summation of elementary density distributions. The tomography is carried out as the optimization of the arrangement of elementary density distributions. As optimization technique, genetic algorithm is introduced. With the present method, high accurate density distribution is calculated with a few interferogram images.
