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02. Industrial Aerodynamics

Regional control of suction flow using excited jets

In contract to a jet flow, a suction flow is simple and non-directional flow. Its application is limited because it requires the installation of additional mechanical attachments such as nozzles and covers on the objects being vacuumed. Thus, it is difficult to miniaturize it as a system. If it is realized, it is possible and expected that the non-contact operation technology for floating particles can be possible and expected to be applied to various fields, including medical and food fields. Therefore, we have been developing a fluidic regional control method using jets instead of mechanical regional control of the suction flow by nozzles or covers, with the aim of miniaturizing the system. However, it is known from previous studies that when the jet flow is injected near the suction slit that forms a potential flow field, there are conditions under which the adjacent jet flow is directly suctioned. In this study, we proposed novel regional control of the suction flow using excited jets that are deflectable by an asymmetrical slit. Specifically, we investigated the possibility of regional control of the suction flow by generating a jet partition that controls the region of the suction flow by adjusting the deflection angle of the excited sub-jet deflected in the opposite direction of the suction slit, its frequency and the velocity amplitude. Mainly, visualization of the flow field between the suction slit and the wall installed downstream of the slit and unsteady measurement of the velocity near the wall were conducted to investigate changes in the direction and region of the suction flow with the jet partition. As the main results, the relationship between the geometrical and the dynamic conditions, which can generate the jet partition, which contributes to an increase in the velocity near the wall, has been clarified.

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Author Information

Kota Nakamori
Mr.
Corresponding author, Presenting author
Kohei Fukawa
Mr.
Koichi Nishibe
Prof.
Kotaro Sato
Prof.