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为简化较大间隙时气浮轴承的数学模型,利用量纲分析方法推导了包含惯性力影响的三维平面气浮轴承的能量方程,得到温度-马赫数关系式.在壁面温度为常值条件下,气膜内的温度与马赫数有关:马赫数急剧增大时,轴承内温度快速下降;马赫数急剧减小时,温度迅速回升;马赫数为1时,最低温度与壁面温度相差20%.当轴承间隙内的气体处于亚音速流动时,温度降低,但降低的程度有限,近似计算轴承的动静态特性时可以忽略温度变化.使用CFD软件计算了较大间隙下气膜内的压力、温度和马赫数分布.结果表明,理论计算值与测试值吻合较好.
In order to simplify the mathematical model of air bearing with large clearance, the energy equation of three-dimensional plane air bearing with inertial force is deduced by the method of dimension analysis, and the relationship between temperature and Mach number is obtained.When the wall temperature is constant , The temperature in the gas film is related to the Mach number: when the Mach number sharply increases, the temperature in the bearing rapidly decreases; when the Mach number decreases drastically, the temperature rises rapidly; when the Mach number is 1, the difference between the minimum temperature and the wall temperature is 20%. When the gas in the bearing gap is subsonic flow, the temperature decreases but the degree of decrease is limited, so the temperature change can be neglected when calculating the dynamic and static characteristics of the bearing approximately. The pressure, temperature and Mach number distribution.The results show that the calculated value is in good agreement with the test value.