An approximate analytical method of gas film pressure in non-parallel gap of spiral groove dry gas seal
SONG Pengyun1, LI Ying2, MA Ailin1
1.Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; 2.South China Branch, Sinopec Sales Co. Ltd., Kunming, Yunnan 650500, China
Abstract：To study the distribution of gas film pressure of deformed spiral groove dry gas seal, an approximate analytical method of the gas film pressure in the non-parallel gap is presented, which stems from the narrow groove theory improved by MUIJDERMAN. An example is presented, and compared with the situation of the parallel gap. The results show that there will be a radius of R, where the pressure of the gas film is the same before and after the deformation. When the gap is divergent(A-shaped), the film pressure decreases in the area of r smaller than R, and the film pressure increases in the area of r greater than R. With θ increasing, the minimum gas film thickness(hmin)decreases, and leakage(m)increases. When the gap is convergent(V-shaped), the film pressure increases in the area of r smaller than R, and decreases in the area of r greater than R. With θ increasing,the minimum gas film thickness(hmin)and leakage(m)decrease first and then increases.
宋鹏云, 李英, 马爱琳. 螺旋槽干气密封端面非平行间隙压力分布的近似解析计算[J]. 排灌机械工程学报, 2015, 33(12): 1049-1055.
SONG Pengyun, LI Ying, MA Ailin. An approximate analytical method of gas film pressure in non-parallel gap of spiral groove dry gas seal. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(12): 1049-1055.
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