Experimental investigation on a turbulence generation system with high-blockage plates

摘要: An experimental study was conducted to develop and characterize systematically a new turbulence generator system yield large turbulent Reynolds numbers in compact configuration. The effect of the geometric parameters two families high-blockage plates on resulting flow field studied: one series characterized by number distribution circular openings; second had non-circular opening(s) with different shapes, position opening(s). were placed upstream contoured contraction near at centerline free jet hot-wire anemometry terms mean axial velocity, intensity, length scales corresponding numbers. plate central, opening produced best compromise highest levels along excellent uniformity average velocity as evidenced scan transverse direction. It appears be most promising one. By comparison more traditional approaches generation, we increased based integral scale values order 1000, which design objectives. Other geometries also yielded intense turbulence, but, some cases, exhibited spurious frequency peaks their power spectrum. generation approach is adapted combustion studies reproduce conditions typical practical relatively small set-ups that are well-suited for bench-top experiments.