عنوان

شبیه سازی میدان جریان سه بعدی در شیارهای یک جهته و دوجهته نشت¬بند گازی خشک

۱۴۲۵۵پ

فارسی

شبیه سازی میدان جریان سه بعدی در شیارهای یک جهته و دوجهته نشت¬بند گازی خشک

/ زهرا سجادیان

: دانشگاه شهیدچمران اهواز، دانشکده مهندسی، گروه مکایک

، ۱۳۹۴

۱۲۱ص.

+همراه سی دی

کارشناسی ارشد

مهندسی مکانیک (تبدیل انرژی)

۱۳۹۴/۰۶/۲۵

Surname: SajadianName: ZahraTitle: Simulation of the three dimension flow field of uni-directional and bi-directional dry gas sealSupervisore: Dr. Mohammad Reza SaffarianAdvisor: Dr. Seyed Saied BahrainianDegree: M. ScField: Mechanical EngineeringDivision: Energy ConversionUniversity: Shahid Chamran University of AhvazFaculty: EngineeringDepartment: Mechanical Engineering Graduating Date:Number of Page: 121Key Words: Flow simulation, Dry gas seal, Uni-directional groove, Bi-directional grooveAbstract: The performance of dry gas seal is simulated by using Computational Fluid Dynamics. The effect of gas flow state on the seal performance is analyzed under different gas film thickness.The Laminar model and k-ε RNG turbulent model are used separately to obtain the opening force, leakage rate and stiffness film.The geometric model of the problem that includes a rotating ring and a fixed ring, was obtained.The grooves of the rotating ring in order to compress the flow. Therefore, the computational area is gas film between two ring and the film gas into the groove. Then the computational domain transfrerred to generate computational mesh software. For the computational domain have been used structure hexahedron cells. According to the results, it was found for all three geometric model that dry gas seal works in laminar flow. For uni-directional optimized geometric parameters are α=15, ξ=1.25 and γ=0.4 Obtained. where α is the groove angle, ξ is the ratio of groove with to the land with(circumferential) and γ is the ratio of dam length(radial).the effect reverse speed on the performance dry gas seal is analyzed. The results showed that the opening force reduces 8% while rate leakage increases 0.38%. Therefore we use the bi-directional groove. For bi-directional groove the two geometric models is analyzed. The results showed that the first geometric model is better than the second geometric model.

پایان نامه کارشناسی ارشد

دانشکده مهندسی

مهندسی مکانیک

تبدیل انرژی

سجادیان، زهرا

صفاریان، محمدرضا، استاد راهنما

بحرینیان، سیدسعید، استاد مشاور

ایران

پ،۱۴۲۵۵،م،۱۳۹۴

p

TF

92029

1

a

Y