Numerical study on the flow and heat transfer characteristics of coupled synthetic jets was carried out.The results show that: Near the slot exit

three synthetic jets couple to one jet and move downstream.Two synthetic jets on both sides are limited and rolled by the middle synthetic jet until they merge together into one centrosymmetric synthetic jet.The synthetic jet spreads rapidly along the minor axis direction of the orifice with bigger spread-angle;while along the major axis direction

the synthetic jet contracts firstly and then spreads slowly.At the target surface impinged by the synthetic jet

the temperature field is symmetric with the lowest filed in center.The heat transfer coefficients also take on the same trends with centrosymmetric waves

which means that the best cooled area is the stagnation.The distribution of heat transfer coefficients along different directions of the target surface is basically uniform.