Numerical prediction of flow and heat transfer in the coolant passages of a gas turbine rotor blade /
Numerical prediction of three- dimensional flow and heat transfer was performed for four cases. 1) A rotating/non-rotating smooth square channel with 180⁰ bend in which the rotation number was varied from 0 to 0.24, the inlet coolant-to-wall density ratio was varied from 0 to 0.22, while the Reynold...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2000.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=727726281&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Numerical prediction of three- dimensional flow and heat transfer was performed for four cases. 1) A rotating/non-rotating smooth square channel with 180⁰ bend in which the rotation number was varied from 0 to 0.24, the inlet coolant-to-wall density ratio was varied from 0 to 0.22, while the Reynolds number was fixed at 25,000. The computation results were compared with experimental data of Wagner et al. (1991). 2) A non-rotating two-pass square channel with and without 90⁰ parallel ribs. The rib height-to-hydraulic diameter ratio (e/D[h]) was 0.125 and the rib pitch-to-height ratio (P/e) was 10. The Reynolds number (Re) was fixed at 30,000. The computation results were compared with Ekkad and Han (1997) data. 3) A non-rotating two-pass square channel with 60⁰ angled parallel ribs in which the rib height-to-hydraulic diameter ratio (e/D[h]) was 0.125 and the rib pitch-to-height ratio (P/e) was 10. The Reynolds number (Re) was fixed at 30,000. 4) A rotating/non-rotating square channel with 45⁰ angled ribs in which the rib height-to-hydraulic diameter ratio (e/D[h]) was 0.1 and the rib pitch-to-height ratio (P/e) was 10. The computation results were compared with Johnson et al. (1994) data at a Reynolds number (Re) of 25,000, inlet coolant-to-wall density ratio ([]p/p) of 0.13 and three rotation numbers (Ro) of 0.0, 0.12, 0.24. A multi-block numerical method was employed together with a chimera domain decomposition technique to calculate three-dimensional flow and heat transfer in a curvilinear, body-fitted coordinate system. The finite-analytic method solved the Reynolds-Averaged Navier-Stokes equation in conjunction with a two-layer k-e isotropic eddy viscosity model and also a near-wall second-order Reynolds stress (second-moment) closure model. The present near-wall second-moment closure model provided an improved flow and heat transfer prediction in comparison with the k-e eddy viscosity model. |
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| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xvi, 148 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 143-147). |