Direct Force Pulser Ignition Response and Thermal Safety Research

The ignition response and thermal safety of the direct force pulser affect the working performance and reliability of the pulse engine. To ensure the normal operation of the direct force pulser, it is necessary to study its ignition response and thermal safety. This paper analyzed the ignition response of the pulse engine by using different voltages to initiate different semiconductor bridge. The results show that with the increase of charging voltage, the ignition time of the bare bridge and parallel NTC bridge decreases to tens of microseconds, and the ignition time of the charged semiconductor bridge decreases to a few microseconds. Under the same voltage, the ignition time of the charged semiconductor bridge generated plasma is the shortest, less than 5µs, and the ignition response is the fastest. At the same time, the force heat transfer calculation and thermal safety analysis of the direct force pulser were carried out, and it is obtained that the temperature of the engine inner wall of the direct force pulser was less than 350K during the multi-batch working process and standby, which has high thermal safety. In addition, the influence of different factors on the thermal safety of the direct force pulser is analyzed, and the maximum temperature difference of the inner wall temperature of the protective layer is 400K for different working times, and 160K for different standby times, that is, the influence of the working time on the thermal safety was larger than that of the standby time.