38 電解法と三次元剥離流

抄録

New application of visualization technique by electrolysis method is proposed here. Usually the cathode or the generator of tracer is a metal rod in existing studies, while in the present study the small parts of the model-surface are numerous cathode-dots which are the uncovered spots surrounding by painted and insulated surface. The principle of the present technique exists on that the electrolysis of phenole-phthalein is possible only on these uncovered 'spots'. The model used has the surface curve of the axisymmetric paraboloid. Clear images of separation line were obtained at wide range of angle of attack of the paraboloid. The present technique also has the following two advantages. First the dots can be shifted after repainting of the model. Second, if we apply large voltage the hydrogen bubble can be generated enough for them to accumulate to make a series of tracer and useful for visualization of vortical flow around a model.