This study focuses on a cooling nozzle which generates a passive jet excitation, without an electric motor or any valve system. Four different nozzle design mechanisms for the jet excitation were developed and tested with respect to their passively generated pulsation. Strouhal number, pressure fluctuation and pulsation amplitude were measured. A Strouhal number close to 0.2 was achieved with one excitation mechanism. The Strouhal number achieved by the other mechanisms was above 0.1.