This paper summarizes the characterization of a pulsating conical jet-fuel spray within a swirling co-flow air,similar to typical gas turbine swirl combustor.The pulsation spray is generated by a piezo actuator driving an outwardly-opening pintle valve at the frequency of 100~400 Hz,at a fixed pressure of 500psi.The co-flowing flow is generated by a typical radial-radial swirl cup with counter rotating swirler vanes.The air-fuel ratios are kept constant by varying the pulsating duration,from 0.14 to.35 ms.Spray visualization of the axial planes are carried out using laser light-sheet illumination in the axial planes,in conjunction with high-speed CMOS digital camera.Phase Doppler measurements of the drop size and velocity are also carried out at a fixed distance downstream.The pulsating conical jet results are compared to a continuous simplex nozzle baseline.The implication to gas turbine combustor lean blow-out and relight conditions are also discussed in the combustion visualization and ignition study.