01. Experimental/Computational Fluid Dynamics

In recent years, major changes have occurred in the mobility sector. The　development of drones, flying cars, and other mobility devices moving in three-dimensional space has been remarkable. Additionally, the increasing demand for cabin comfort such as personal air conditioning and pandemic control has led to the need to generate new flow fields. Jet flow control technology is useful for innovations in mobility attitude control and air-conditioning technologies. Jet flow direction control technology is used in various fields such as aircraft attitude control and air- conditioning vents. Currently, the main methods are based on changes in geometry such as moving wings. However, adjustments using movable wings result in complex structures and large weights. Therefore, several researchers have analyzed fluidic thrust vectoring, in which the direction is controlled by the fluid force without changing the geometry. However, most studies have been conducted under free-jet conditions with no boundaries near the jet. There is insufficient verification under conditions in which the Coanda effect cannot be ignored, such as in complex aircraft geometries or cabins. Furthermore, a few studies have applied synthetic jets to secondary flows. In this study, a synthetic jet was used for secondary flow and both Coanda surfaces and flat-plate walls were placed near the slot to investigate the deflection characteristics of the jet. The deflection characteristics were experimentally confirmed with the dimensionless length of the plate wall and the offset ratio as the main parameters. The main results show that the jet deflection characteristics depend on the relative wall length and offset ratio, and the relationship between the dimensionless frequency and deflection characteristics.

Prof.

Kotaro Sato