Dissertation > Industrial Technology > General industrial technology > Industrial common technology and equipment > Sealing technology

Researches of Flow Performance and Similitude Theory for Honeycomb Seals

Author WanXinChao
Tutor ZhengQun
School Harbin Engineering University
Course Marine Engineering
Keywords Honeycomb seals Numerical Simulation Sealing mechanism Similar guidelines Mold design
Type Master's thesis
Year 2010
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Gas turbine advanced sealing technology is a branch of the areas the the advanced sealing reflected in the improvement of engine performance , fuel consumption rate decreased to reduce operation and maintenance costs , etc. Over the last decade , pay close attention abroad . The honeycomb seal technology is the forefront of advanced sealing technology research direction , through a large number of domestic and international data collection and reading, and subject research , a comb and cellular composition of the sealing structure and aerodynamic calculation . The main content of this paper include the following aspects: 1 . Designed a series combined into sealed by the comb and cellular structure as the research object . By using three-dimensional numerical method to study the cellular sealed internal flow field , the special hexagonal structure and the energy from the honeycomb seals dissipation angle the honeycomb seal sealing mechanism , the following conclusions : a special hexagonal honeycomb seals -shaped structure and a thin wall thickness, having a good segmentation , vortex, damping, the thermodynamic energy dissipation , the throttle effect, so that the leakage fluid may be divided into small eddy current , can be reduced seal cavity pressure of the fluid , so that the kinetic energy of the leakage flow is efficiently converted into thermal energy , to improve the energy dissipation effect , thereby reducing the amount of leakage, and to improve the sealing effect . Computational fluid dynamics software CFX software on different pressure of the flow field of the rotor within the honeycomb seals at different speeds , different cellular structure and comb structure under various conditions were analyzed , and then summarize the honeycomb seals the internal flow field changes law. The point of view of the development of the vortex fluid from a sealed chamber , the energy dissipation honeycomb seals the main factor and the amount of leakage variation . 4 to cellular sealed as the research object , through theoretical study shows honeycomb seals mold design to meet the sealing effect and shall comply with similar criteria . Similar parameters and in accordance with the determined similarity criterion , the analysis of the flow field of the mold design of the honeycomb seal , and the the comparative molding of the honeycomb seal , analyze the accuracy of the mold design .

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