用形状因子对应态原理预测液化天然气密度

PREDICTION OF LNG DENSITIES WITH PRINCIPLE OF CORRESPONDING STATE OF SHAPE FACTOR

应用形状因子法对应态原理预测了液化天然气 ( L NG)密度。选用甲烷作为参考流体 ,采用了精确的甲烷状态方程和两元交互作用系数 ,并将理论计算结果与实验结果进行了比较 ,取得较好结果 ,满足了 L NG密度的高精度计算要求 ,同时也是形状因子法对应态原理在低温液体混合物热物性计算中的成功应用之一。

The principle of corresponding state of shape factor is applied to predicting the densities of LNG.For instance,methane is chosen as a reference fluid,high precison equation of state and suitable binary interaction parameters are adopted.The comparison between calculations and experiments shows that the numerical results are in good agreement with the experimental data,so the method presented meets the requirements of the high precision calculation for LNG densities,and it is also a success in prediction of thermal properties of cryogenic liquid mixtures with the principle of corresponding state of shape factor. hnical University) [WT5HZ]ABSTRACT [WT5BZ]From mathematical statistics of test data has been drawn the following conclusion:the low cycle fatigue life of disks scatters due to their size difference.The cylic stress strain curve and the strain life relationship of a materical must consider requirements of the survival probability and believable degree when the low cycle fatigue life of a disk is estimated with the partial stress strain method.This paper also provides an approximate correction method for the preliminary estimation of the low cycle fatigue life of a disk.