润滑与密封
潤滑與密封
윤활여밀봉
LUBRICATION ENGINEERING
2015年
7期
46-50,74
,共6页
气体润滑%实际气体%分子平均自由程%压缩因子%Virial方程
氣體潤滑%實際氣體%分子平均自由程%壓縮因子%Virial方程
기체윤활%실제기체%분자평균자유정%압축인자%Virial방정
gas lubrication%real gas%molecule mean free path%compressibility factor%Virial equation
考虑微间隙气体润滑计算中的实际气体效应时，需要计算实际气体分子平均自由程。提出一种基于Virial系数的实际气体分子平均自由程的计算方法，该方法通过Virial方程确定实际气体状态方程中的压缩因子，基于理想气体分子平均自由程的算法，用实际气体状态方程代替理想气体状态方程，从而计算得到实际气体分子平均自由程。采用该方法计算不同压力下，空气、 CO2、 N2、 H2实际气体分子平均自由程，并与理想气体分子平均自由程进行比较。结果表明，空气的实际气体分子与理想气体分子的平均自由程计算结果差别很小；常压下，空气、 CO2、 N2实际气体分子平均自由程略小于理想气体， H2的实际气体分子平均自由程略大于理想气体；随着压力增大，分子平均自由程减小，实际气体分子平均自由程偏离理想气体分子平均自由程的程度增加。
攷慮微間隙氣體潤滑計算中的實際氣體效應時，需要計算實際氣體分子平均自由程。提齣一種基于Virial繫數的實際氣體分子平均自由程的計算方法，該方法通過Virial方程確定實際氣體狀態方程中的壓縮因子，基于理想氣體分子平均自由程的算法，用實際氣體狀態方程代替理想氣體狀態方程，從而計算得到實際氣體分子平均自由程。採用該方法計算不同壓力下，空氣、 CO2、 N2、 H2實際氣體分子平均自由程，併與理想氣體分子平均自由程進行比較。結果錶明，空氣的實際氣體分子與理想氣體分子的平均自由程計算結果差彆很小；常壓下，空氣、 CO2、 N2實際氣體分子平均自由程略小于理想氣體， H2的實際氣體分子平均自由程略大于理想氣體；隨著壓力增大，分子平均自由程減小，實際氣體分子平均自由程偏離理想氣體分子平均自由程的程度增加。
고필미간극기체윤활계산중적실제기체효응시，수요계산실제기체분자평균자유정。제출일충기우Virial계수적실제기체분자평균자유정적계산방법，해방법통과Virial방정학정실제기체상태방정중적압축인자，기우이상기체분자평균자유정적산법，용실제기체상태방정대체이상기체상태방정，종이계산득도실제기체분자평균자유정。채용해방법계산불동압력하，공기、 CO2、 N2、 H2실제기체분자평균자유정，병여이상기체분자평균자유정진행비교。결과표명，공기적실제기체분자여이상기체분자적평균자유정계산결과차별흔소；상압하，공기、 CO2、 N2실제기체분자평균자유정략소우이상기체， H2적실제기체분자평균자유정략대우이상기체；수착압력증대，분자평균자유정감소，실제기체분자평균자유정편리이상기체분자평균자유정적정도증가。
When the effect of real gas in the calculation of micro gap gas lubrication is considered,the molecule mean free path of the real gas is required to calculate.A calculation method of the molecule mean free path of the real gas was proposed based on Virial coefficient.According to this calculation method,the compressibility factor in real gas state equa?tion was determined by Virial equation,and by substituting the ideal gas state equation with the real gas state equation,the molecule mean free path of the real gas was calculated based on the algorithm of the molecule mean free path of the ideal gas.The molecule mean free paths of the real gas of dry air,CO2,N2,H2 at different pressures were calculated respectively by using this method,and compared with the results of their ideal gas. The results show that the molecule mean free paths of the real gas of dry air are quit close to the calculation results from the idea gas.Under normal pressure,the molecule mean free paths of the real gas of the dry air,CO2 ,N2 are slightly less than those of their ideal gas,and the molecule mean free path of the real gas of H2 is slightly larger than that of the ideal gas.Along the increasing of the pressure,the molecule mean free path is decreased;and the difference of the molecule mean free path between the real gas and the ideal gas is in?creased.
