Results of microbubble experiments are shown. First, the measurement of skin friction reduction by microbubbles in a small high-speed circulating water tunnel is shown. Second, those carried out using a 12 m-long flat plate ship in a 400 m-long towing tank are shown. Lastly, those with a 50 m-long flat plate ship are shown. They indicate that the skin friction reduction increases with the increase of injected air volume and depend on the local void ratio near the solid wall, and that the maximum skin friction reduction obtained using a 50 m-long ship was 20 percent.
50m平板船を用いたマイクロバブル実験
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