A Flow visualization study is performed in a rotating impeller of multi-blade blowers by using polystyrene pellets technique inwatertank. The following results are obtained. (1) Separation in formed near the front part of the blade and is suppressed near the rear part of the blade, for the region beyond 1.5π of circumferential position θ in the opera-tion range above 0.25 of the capacity coefficient ?? .
(2) Separetion is formed largely in all blades under ?? =0.1.
(3) Two spiral flows are observed in the scroll.

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For the purpose of visualizing two-dimensionally converging shock waves which are reflected from concave walls, computer shadowgraphs were developed based on the principle of optical shadowgraph. The numerical analysis was carried out by solving the two-dimensional Euler-type equations by means of piecewise-linear-method. In order to experimentally verify the computer shadowgraphs, the converging shock waves were visualized by optical shadowgraph technique. This was performed in a shock tube. Comparisons of the computer shadowgraphs with the optical shadowgraphs show fairly good agreement.

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