The velocity distributions of synthetic jet were measured with Hot-wire anemometer.Experimental result shows that two distinct regions exist in the flow-field created by the actuator.Close to the slot-exit

the mean centerline velocity accelerates downstream to a maximum at distance of approximately 10～15 slot-width

when signal frequency is 980 Hz and amplitude is 40 V.At streamwise distance larger than approximately 10～15 slot-width

the flow pattern changes as conventional jet.Velocity profile across the synthetic jet appears like the profile in conventional jet

but velocity gradient is much large.At the exit of combustor

excitation using synthetic jet can improve the distribution of temperature and decrease contents of NOx.Synthetic jet is effective for active flow control purpose.