摘要
以螺旋槽上游泵送机械密封为研究对象,用有限差分法离散Reynolds方程,基于轴向力平衡条件作为迭代收敛准则,采用逐次超松弛迭代(SOR)法在Mathematica软件中编程求解液膜压力分布,以及相关密封特性参数,并分析不同工况参数与结构参数对密封特性的影响。研究结果表明:泵送率随进口压力的增加呈非线性减小,随转速、槽深、槽长坝长比的增加呈非线性增大;液膜摩擦因数随着转速的增加近似以线性方式增大,随进口压力、槽深、槽长坝长比的增加呈非线性减小;随着螺旋角的增大泵送率先增大后减小,而液膜摩擦因数表现出与泵送率相反的趋势,说明螺旋角存在最优值;相比于结构参数对密封特性的影响,工况参数的影响较大。
Taking the spiral groove upstream pumping mechanical seal as the research object,the finite difference method was used to discretize the Reynolds equation,and based on the axial force balance condition as the iterative convergence criterion,the successive over relaxation(SOR)iteration method was used to solve the liquid film pressure distribution and related sealing characteristic parameters in the Mathematica software.The influence of different working condition parameters and structural parameters on sealing characteristics was analyzed.The results show that the pumping rate decreases nonlinearly with the increase of inlet pressure,and increases nonlinearly with the increase of speed,groove depth,and the ratio of groove length to dam length.The friction coefficient of the liquid film increases linearly with the increase of speed,and decreases nonlinearly with the increase of inlet pressure,groove depth,and the ratio of groove length to dam length.With the increase of helix angle,the pumping rate first increases and then decreases,while the friction coefficient of the liquid film shows an opposite trend to the pumping rate,indicating that there is an optimal helix angle which makes the sealing performance the best.Compared with the structural parameters,the working parameters have a greater influence on sealing performance.
作者
王朝亚
唐大全
赵春林
严如奇
丁雪兴
WANG Zhaoya;TANG Daquan;ZHAO Chunlin;YAN Ruqi;DING Xuexing(College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China;Chengdu Yitong Seal Co.,Ltd.,Chengdu Sichuan 610100,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2021年第9期82-90,共9页
Lubrication Engineering
基金
国家自然科学基金项目(51865019).
