The Influence of a Pulsed Driver on the Micro Shock Propagation

A high-speed magnetic valve is applied to generate a shock wave with an initial Mach number of 1.6 in a square shock tube with 200 μm hydraulic diameter. Different from previous works, the current work focuses on the effects of a pulsed driver. These effects are caused by unsteady conditions resulting from the short duration of the valve opening τ time. Experiments are performed for different values of τ. The results show that τ correlates with the micro shock attenuation and the friction. Different from expectation, a pulsed driver does not necessarily result in a weaker shock wave.