建立并列式扇贝阻尼密封三维数值分析模型，采用计算流体力学(CFD)方法，并基于动网格技术及多频椭圆涡动轨迹的密封动力特性求解方法研究进口压力、预旋比及转速对并列式扇贝阻尼密封动静特性的影响。结果表明：并列式扇贝阻尼密封的直接刚度随进口压力的减小、转速的增加而升高；在不同预旋比下，直接刚度均为负，不利于密封系统静态稳定。并列式扇贝阻尼密封有效阻尼随进口压力的增加、预旋比及转速的减小而增大，使密封系统更稳定；进口压力对有效阻尼影响较显著，进口压力pin=0.505 MPa时的有效阻尼相较于pin=0.303 MPa工况下最高提升了约83%。并列式扇贝阻尼密封的泄漏量随进口压力的减小而显著降低，预旋会降低密封泄漏量，转速对密封泄漏量影响较低。

A threedimensional numerical analysis model of paralleling scallop damper seal was established,and the effects of inlet pressure,preswirl ratio and rotational speed on the dynamic and static characteristics of paralleling scallop damper seal were studied by using the computational fluid dynamics(CFD) method and based on dynamic grid and multiple frequencies elliptic whirling trajectory.Results show that the direct stiffness of the paralleling scallop damper seal increases with decreasing inlet pressure and increasing rotational speed.Under different preswirl ratios,the direct stiffness is negative,which is not conducive to the static stability of the seal system.The effective damping of the paralleling scallop damper seal increases with the increase of the inlet pressure,the decrease of the preswirl ratio and the rotational speed,and the seal system is more stable.Among them,the effective damping is significantly affected by the inlet pressure,and the effective damping under the inlet pressure pin=0.505 MPa is about 83% higher than that under the condition of pin=0.303 MPa.The leakage of the paralleling scallop damper seal is significantly reduced with decreasing of the inlet pressure.The preswirl will reduce the leakage of the seal,and the rotational speed has a low effect on the leakage of the seal.

TK730.2

国家自然科学基金(51875361)；上海市自然科学基金(20ZR1439200)