Semi-active accumulator absorbing pressure pulsation in high-pressure water-jet propulsion system

摘要

Large-capacity and high-pressure plunger water-pump is often used as power supply-in high-pressure water-jet propulsion system (HWPS). Generally, the flow pulsation and pressure pulsation generated in the working process of HWPS is absorbed by a passive accumulator. If work condition of HWPS changes, the function of passive accumulator absorbing pressure pulsation will weaken. In order to solve this problem, the mathematical model of passive accumulator was established; then, the ability of passive accumulator absorbing pressure pulsation was theoretically analysed when rotation speed of the water-pump and steady-state pressure of HWPS changed. Thereafter, a semi-active accumulator was advanced on the basis of the analytical theory. In order to get the best effect of absorbing pressure pulsation, the semi-active accumulator employed the messages of HWPS pressure and the water-pump rotation speed to regulate the cross-sectional area of its anterior pipeline, thereby to alter its natural frequency. Results of simulation and experiment revealed that pressure pulsation was absorbed better by semi-active accumulator than by passive accumulator when the rotation speed and steady-state pressure changed.