The cylindrical slide valve is an essential component of the hydraulic system, which regulates and controls the oil. When hydraulic oil flows through the slide valve port, cavitation often occurs due to a sharp pressure drop, affecting the hydraulic system's stability. Therefore, the study of cavitation phenomena in valves is an important topic. This paper conducts a transient numerical simulation of the three-dimensional multi-physics field in the valve under different inlet pressure and oil temperature conditions and studies the effects of different inlet pressures and oil temperatures on the oil's temperature rise and cavitation phenomenon at the valve port. The results show that under high-pressure differences, the temperature of hydraulic oil rises significantly. In addition, the increase in oil temperature will significantly affect the cavitation intensity in the valve. When the oil temperature is 330 K, the severity of cavitation in the valve under a pressure of 5 MPa is roughly the same as when the oil temperature is 300 K, and the inlet pressure is 15 MPa. Under different inlet pressure and oil temperature conditions, the pressure pulsation in the slide valve is also very different. Under certain working conditions, the peak power spectrum density of the pressure pulsation is close to the hydraulic natural frequency, which may cause the slide valve to self-excited oscillation. Therefore, it is recommended that under actual working conditions, the oil temperature should be lowered in time to reduce the adverse effects of valve port cavitation.

中文翻译：

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液压滑阀温升和空化流动的数值模拟

圆筒滑阀是液压系统中必不可少的元件，起调节和控制油液的作用。当液压油流经滑阀口时，常因压力急剧下降而产生气蚀，影响液压系统的稳定性。因此，阀门空化现象的研究是一个重要的课题。本文对不同入口压力和油温条件下阀内三维多物理场进行瞬态数值模拟，研究不同入口压力和油温对阀口油温升和空化现象的影响。结果表明，在高压差作用下，液压油的温度明显升高。另外，油温的升高也会显着影响阀内的空化强度。当油温为330 K时，在5 MPa压力下阀门内空化的严重程度与油温为300 K、入口压力为15 MPa时大致相同。在不同的入口压力和油温条件下，滑阀内的压力脉动也有很大差异。在某些工况下，压力脉动的峰值功率谱密度接近于液压固有频率，可能会引起滑阀自激振荡。因此，建议在实际工况下，应及时降低油温，以减少阀口气蚀的不利影响。