Effects of Blade Fillet Structures on Flow Field and Surface Heat Transfer in a Large Meridional Expansion Turbine
| Autor: | Qun Zheng, Fusheng Meng, Jian Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Leading edge
Control and Optimization Materials science fillet configuration 020209 energy Energy Engineering and Power Technology 02 engineering and technology lcsh:Technology 01 natural sciences Turbine large meridional expansion 010305 fluids & plasmas thermal load 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Fillet (mechanics) Engineering (miscellaneous) aerodynamic loss lcsh:T Renewable Energy Sustainability and the Environment Turbulence Turboexpander Mechanics Vortex Boundary layer Heat transfer Energy (miscellaneous) |
| Zdroj: | Energies Volume 12 Issue 15 Energies, Vol 12, Iss 15, p 3035 (2019) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en12153035 |
| Popis: | This paper is a continuation of the previous work, aiming to explore the influence of fillet configurations on flow and heat transfer in a large meridional expansion turbine. The endwall of large meridional expansion turbine stator has a large expansion angle, which leads to early separation of the endwall boundary layer, resulting in excessive aerodynamic loss and local thermal load. In order to improve the flow state and reduce the local high thermal load, five typical fillet distribution rules are designed. The three-dimensional Reynolds-Averaged Navier-Stokes (RANS) solver for viscous turbulent flows was used to investigate the different fillet configurations of the second stage stator blades of a 1.5-stage turbine, and which fillet distribution is suitable for large meridional expansion turbines. The influence of fillet structures on the vortex system and loss characteristics was analyzed, and its impact on wall thermal load was studied in detail. The fillet structure mainly affects the formation of horseshoe vortexes at the leading edge of the blade so as to reduce the loss caused by horseshoe vortexes and passage vortexes. The fillet structure suitable for the large meridional expansion turbine was obtained through the research. Reasonable fillet structure distribution can not only improve the flow state but also reduce the high thermal load on the wall surface of the meridional expansion turbine. It has a positive engineering guiding value. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |