複数楕円形噴流の流れ特性に与えるノズルアスペクト比と方向の影響

抄録

The present paper reports on an experimental investigation of the mixing and development process of multiple elliptic jets with 6×6 square matrix nozzles arrangement at a Reynolds number of 4.0×10³. The multiple elliptic nozzles for aspect ratios of a/b = 2.25 and 6.25 were arranged with the same and the alternate azimuthal orientations. The flow field was measured using the X-type hot-wire probe. The development process of multiple elliptic jets was visualized by the contours of mean and fluctuating velocities at the y-z cross-sections. The multiple elliptic jets merge into a single square jet flow, and the merging point depends on the equivalent diameter. In the case of multiple elliptic jets for a/b = 6.25 with the alternate azimuthal orientation, the axis-switching phenomenon does not occur in the downstream due to the secondary flow induced by the entrainment.