An investigation of tip force and heat generation characteristics of brush seals
Başlık çevirisi mevcut değil.
- Tez No: 720791
- Danışmanlar: DR. JOHN A. TİCHY
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2004
- Dil: İngilizce
- Üniversite: Rensselaer Polytechnic Institute
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 142
Özet
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Özet (Çeviri)
Brush seals recently find increasing use in turbomachinery due to their compliant nature and superior leakage performance over conventional labyrinth seals. Utilizing high temperature super-alloy fibers and their compliance capability, these seals maintain contact with the rotor for a wide range of operating conditions leaving minimal passage for parasitic leakage flow. Consequently, contact force/pressure generated at seal rotor interface is of importance for sustained seal performance and service life longevity. Furthermore, due to the contact forces at the interface, frictional heat generation is inevitable and must be evaluated for various design and operating conditions. Although some analytical and numerical models are developed to estimate bristle tip pressures, these simply rely on linear beam equation calculations and various assumptions for loading conditions. In this study, previously available analytical and numerical models for bristle tip force/pressure have been modified and enhanced. An empirical model has been developed for tip forces under various operating conditions with the support of testing. In addition, frictional heat generation at seal rotor interface has been modeled via CFD that was built to study temperature rise for given design and operating conditions. Furthermore, a test fixture was constructed to measure temperature rise at the interface utilizing infrared thermography. For comparison, the results were fed into a conduction model, which was created utilizing commercially available software. Overall, this work presents various improvements in analytical capabilities for the brush seal design that may lead to application specific performance enhancements.
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