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Studies on Aero-Thermal Performances of Leakage Flows lnjection from the Endwall Slot in Linear Cascade of High-Pressure Turbine
https://doi.org/10.15113/00010395
https://doi.org/10.15113/00010395c2b291ee-f804-4d60-a239-eca62bf19b8f
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要旨 (256.0 kB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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| 公開日 | 2014-11-10 | |||||
| タイトル | ||||||
| タイトル | Studies on Aero-Thermal Performances of Leakage Flows lnjection from the Endwall Slot in Linear Cascade of High-Pressure Turbine | |||||
| その他の言語のタイトル | ||||||
| その他のタイトル | エンドウォールスロットからの漏れ流れを伴う高圧タービン直線翼列の熱流体的特性に関する研究 | |||||
| 著者 |
Wan, Aizon Bin W Ghopa
× Wan, Aizon Bin W Ghopa |
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| 著者(機関) | ||||||
| 値 | 岩手大学大学院工学研究科 | |||||
| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Turbomachinery | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | secondary flow | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | endwall film cooling | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | leakage flow | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | purge flow | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | heat transfer | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | high-pressure turbine | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | liquid crystal | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | transient method | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | pressure loss | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | slot orientation | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | slot position | |||||
| Abstract | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Present studies focus on thermal and aerodynamics investigations of leakage flow injection through a slot which is located at upstream of blade leading edge. In the real gas turbine, this slot is actually the gap between the combustor and turbine endwall as for the maintenance works consideration. However, the slot induced to the leakage phenomenon caused by the bypassed air that coming from the compressor side for turbine cooling purposes. Gas turbine manufactures intended to minimize these kinds of leakages in maintaining the aerodynamics performance of the turbine cascade. However, previous researchers found that the leakages could be used to protect the endwall surfaces from the hot gas since it could not be completely prevented. Thus, present study investigated the potential of leakage flows as a function of film cooling. Chapter 1 gives some introduction on present works about the need of film cooling to protect the wall surfaces. Several related studies by previous researchers are also explained. Chapter 2 explained the details of methodologies used in present studies. A leakage flow with 90° of injection angle was considered as for the baseline configuration. Liquid crystal was used for the time-varying endwall temperature measurement. The transient method was applied to determine the film cooling effectiveness, η and the heat transfer coefficient, h for the thermal performance evaluations. The details of the aerodynamics performances was revealed by conducting 5-holes Pitot tube measurement at blade downstream plane (1.25Cax) and the total pressure loss coefficient, Cpt as well as the flow vorticity, ζ contours were plotted. Furthermore, the effects of the leakage flow with the mainstream consist of complex secondary flows structures also have been revealed by numerical investigation. In present study, the flow is analyzed by using the three-dimensional, steady Reynolds-averaged Navier-Stokes (RANS) equations by conducting Shear Stress Transport, SST turbulence model. The leakage was injected with a various amount (which is described by mass flow ratio, MFR) to observe theηperformance at different injection cases. Chapter 3 provided details discussions on the aero and thermal performances of the leakage injection. Both experimental and numerical presented the performance ofηincreased when the injection amount increases. SST turbulence model captured the presence of the separation flow that caused the lower h region which also captured by the experimental. As for the aerodynamics performance, Cpt was increased after the introduction of leakage injection and indicated the increase trend when the MFR was being increased. Leakage flows were prevented to be injected into high pressure region thus they tended to move towards lower pressure region which is between two stagnation regions. As a result, a newly generated vortex core was predicted. This accumulated vortex core (AFV) is considered to contribute to the additional losses at blade downstream. Chapter 4 presents the numerical investigation on the modification of slot configurations such as positions and orientations. The leakages flow by shallower injection angle, βtowards mainstream was predicted to reduce the strength of the passage vortex thus increase the aerodynamics performance particularly at higher injection cases. Additionally, ηalso obviously increased by the slot orientation. To move away the slot from the blade LE was predicted to increase both aero and thermal performance. The leakage flow could laterally be penetrated to the mainstream and stayed closer on endwall surfaces. This is due to the fewer blockages influenced by the stagnation region since the slot located far away from the blade LE. In contrast, move the slot closer towards blade LE just increased the Cpt Furthermore, locate the slot closer to blade LE could not increase the protection layer except the level of η. Finally, Chapter 5 highlights the important points to be concluded based on present investigations. The potential of the leakage flows to protect the endwall surfaces has been proven and they were highly influenced by the secondary flows behavior on the endwall region. However, to increase the performance of cooling by increasing the injection amounts unfortunately reduces the aerodynamics performance due to the increase strength of the secondary flow vortices. The leakage flow with a shallow injection angle towards mainstream are predicted to provide a positive trends of cooling performance with a lower aerodynamic losses especially at higher leakage flow injection cases. | |||||
| 出版者 | ||||||
| 出版者 | 岩手大学 | |||||
| 登録日 | ||||||
| 日付 | 2014-11-10 | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||
| 資源タイプ | doctoral thesis | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| ID登録 | ||||||
| ID登録 | 10.15113/00010395 | |||||
| ID登録タイプ | JaLC | |||||
| 書誌情報 | p. 1-154, 発行日 2013 | |||||
| 学位の区分 | ||||||
| 値 | 博士 | |||||
| 学位授与番号 | ||||||
| 学位授与番号 | 甲第240号 | |||||
| 学位の分野 | ||||||
| 値 | 工学 | |||||
| 学位名 | ||||||
| 学位名 | 博士 (工学) | |||||
| 学位授与年月日 | ||||||
| 学位授与年月日 | 2013-09-25 | |||||
| 学位授与機関 | ||||||
| 学位授与機関識別子Scheme | kakenhi | |||||
| 学位授与機関識別子 | 11201 | |||||
| 学位授与機関名 | 岩手大学 | |||||
