摘要
在空气静压润滑中由于空气具有黏性,在其流过狭窄通道时与壁面摩擦,压强将降低,温度会发生变化,从而导致工作面变形和气膜刚度变小,因此在精度要求高的应用场合,就不能忽略温度的影响,而计算空气节流前后的温度变化量,需得到空气的焦耳-汤姆逊系数。分别利用立方型状态方程和BWRS方程对不同供气温度和供气压力下空气的焦耳-汤姆逊系数进行计算。结果表明:RK方程和SRK方程求得的结果相差甚小;各方程具有相同的变化趋势,随着供气温度的升高和供气压力的增大,空气的焦耳-汤姆逊系数都将减小,其中供气温度对空气的焦耳-汤姆逊系数影响比供气压力更大。
Due to the existence of sticky, there is friction between air and wall when air passes through narrow channel in air aero-static lubrication system. This will cause air pressure dropping down and temperature change, and bring bad effects such as working facedeformation, gas film stiffness decrease. In accuracy fields, the effect of temperature change should be taken into account, and when cal-culating the air temperature variation in the process of throttling, the Joule-Thomson coefficient must be calculated firstly. Cubic equationof state and BWRS equation were used to obtain the Joule-Thomson coefficient under different air supply temperature and air pressure. Theresults show that the calculation results of RK and SRK equations are approach; the calculation results of these equations have the samechange tendency, that is the Joule-Thomson coefficient are decreased with the increase of air temperature and air pressure, whereas the airsupply temperature has greater influence than air pressure to Joule-Thomson coefficient.
出处
《润滑与密封》
CAS
CSCD
北大核心
2014年第6期103-107,共5页
Lubrication Engineering
基金
国家自然科学基金项目(51075378)
