为探明扇贝阻尼密封在不同阻塞状态下的静态稳定性，应用计算流体力学方法研究阻塞、非阻塞工况对扇贝阻尼密封静态刚度与气流力的影响规律。研究表明：阻塞工况下，不同错开角及中高长径比下密封气流力、静态刚度均随偏心率增加而降低，低长径比密封气流力在高偏心下较大；非阻塞工况下，不同错开角、长径比的密封气流力随偏心率增加而增大，高偏心率下静态刚度较小，非阻塞工况密封静态稳定性高于阻塞工况；由于进出口压差存在，使得扇贝阻尼密封马赫数在进出口两端增长较大，非阻塞状态进出口段马赫数变化幅度小于阻塞状态。

In order to explore the static stability of scallop damped seal under different choked conditions, computational fluid dynamics (CFD) was used to study the influence of choked and unchoked conditions on the static stiffness and fluidinduced force of scallop damped seal. Results show that under choked conditions, fluidinduced force and direct static stiffness with different interlaced angles, middle and high lengthtorotor diameter ratios (l/d) reduce with the increase of eccentric ratio, and fluidinduced force with low l/d is bigger under high eccentricity; under unchoked flow condition, the fluidinduced force with different interlaced angles and l/d increases with the increase of eccentric ratio, and static stiffness is smaller under high eccentricity. The static stability of the seal under unchoked flow condition is higher than that under choked flow condition; due to the pressure difference at the inlet and outlet, the Mach number of scallop damper seal increases greatly at the inlet and outlet, while the amplitude of Mach number variation in the inlet and outlet section under unchoked flow condition is less than that under choked flow condition.

TK263

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