深海环境下的齿轮泵效率研究

Efficiency Study of Gear Pump in Deep-sea

深海高压、低温的特殊环境会导致液压油的属性发生改变,而液压油作为齿轮泵的工作介质,其变化将严重影响齿轮泵的效率。为了研究深海环境对齿轮泵效率的影响,利用CFD方法建立了齿轮泵内流场模型,研究了不同海水深度以及不同工况时的齿轮泵效率。结果表明:深海环境下,海水深度越深,齿轮泵的效率越低。环境压力与海水温度的变化对齿轮泵的效率均有一定影响,且前者的影响更为显著。随着海水深度的增加,环境压力对效率的影响在转速大于1 900r/min时较为明显,效率降低约6%,在转速小于1 900 r/min时,效率仅降低约3%;海水温度对效率的影响在转速小于1 900 r/min时较为明显,效率降低约4%,转速大于1 900 r/min时,效率仅降低约2.5%。

The high pressure and low temperature of special environment in deep-sea will lead to change of the property of hydraulic oil. The change of hydraulic oil will seriously affect the efficiency of gear pump as a working medium. In order to study the influence of the deep-sea environment on the efficiency of the gear pump,the internal flow field model of the gear pump is established by using the Computational Fluid Dynamics（ CFD） method. The efficiency of gear pump with different sea-depth was studied. The results indicate that the efficiency of gear pump decreases with the increase of sea-depth. The influence of environmental pressure on the efficiency is higher than that of sea temperature,and the pressure of that is more obvious. With the increase of sea-depth,the effect of environmental pressure on the efficiency is more obvious when the rotational speed is more than 1 900 r/min,the efficiency is reduced by about 6% and when the rotational speed is less than 1 900 r/min,the efficiency is reduced by only about 3%. The effect of temperature on the efficiency is obvious when the rotational speed is less than 1 900 r/min,the efficiency is reduced by about 4%,and when the rotational speed is higher than 1 900 r/min,the efficiency is reduced by only about 2. 5%.