A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface
In order to explore the effect of blowing ratio on film cooling over a convex surface, the present study adopts the transient liquid crystal thermography for the film cooling measurement on a straight circular hole configuration. The test piece has a strength of curvature (2r/D) of 92.5, pitch to di...
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| Format: | Article |
| Language: | English |
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Wiley
2001-01-01
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| Series: | International Journal of Rotating Machinery |
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| Online Access: | http://dx.doi.org/10.1155/S1023621X01000148 |
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| author | Ping-Hei Chen Min-Sheng Hung Pei-Pei Ding |
| author_facet | Ping-Hei Chen Min-Sheng Hung Pei-Pei Ding |
| author_sort | Ping-Hei Chen |
| collection | DOAJ |
| description | In order to explore the effect of blowing ratio on film cooling over a convex surface, the present study adopts the transient liquid crystal thermography for the film cooling
measurement on a straight circular hole configuration. The test piece has a strength of
curvature (2r/D) of 92.5, pitch to diameter ratio
(P/D) of 3 and streamwise injection
angle (γ) of 35∘ All measurements were conducted under the mainstream Reynolds
number (Red) of 1700 with turbulence intensity (Tu) of 3.8%, and the density ratio between coolant and mainstream (ρc/ρm) is 0.98. In current study, the effect of blowing
ratio (M) on film cooling performance is investigated by varying the range of blowing
ratio from 0.5 to 2.0. Two transient tests of different injection flow temperature were
conducted to obtain both detailed heat transfer coefficient and film cooling effectiveness
distributions of measured region. The present measured results show that both the
spanwise averaged heat transfer coefficient and film cooling effectiveness increase with
decreased blowing ratio. |
| format | Article |
| id | doaj-art-ddf0575b171d4c5d9ca2caa774b3892a |
| institution | Kabale University |
| issn | 1023-621X |
| language | English |
| publishDate | 2001-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-ddf0575b171d4c5d9ca2caa774b3892a2025-08-20T03:26:05ZengWileyInternational Journal of Rotating Machinery1023-621X2001-01-017315316410.1155/S1023621X01000148A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surfacePing-Hei Chen0Min-Sheng Hung1Pei-Pei Ding2Department of Mechanical Engineering, National Taiwan University, Taipei 10617, TaiwanDepartment of Mechanical Engineering, National Taiwan University, Taipei 10617, TaiwanDepartment of Mechanical Engineering, National Taiwan University, Taipei 10617, TaiwanIn order to explore the effect of blowing ratio on film cooling over a convex surface, the present study adopts the transient liquid crystal thermography for the film cooling measurement on a straight circular hole configuration. The test piece has a strength of curvature (2r/D) of 92.5, pitch to diameter ratio (P/D) of 3 and streamwise injection angle (γ) of 35∘ All measurements were conducted under the mainstream Reynolds number (Red) of 1700 with turbulence intensity (Tu) of 3.8%, and the density ratio between coolant and mainstream (ρc/ρm) is 0.98. In current study, the effect of blowing ratio (M) on film cooling performance is investigated by varying the range of blowing ratio from 0.5 to 2.0. Two transient tests of different injection flow temperature were conducted to obtain both detailed heat transfer coefficient and film cooling effectiveness distributions of measured region. The present measured results show that both the spanwise averaged heat transfer coefficient and film cooling effectiveness increase with decreased blowing ratio.http://dx.doi.org/10.1155/S1023621X01000148Convex surfaceFilm coolingLiquid crystal thermography. |
| spellingShingle | Ping-Hei Chen Min-Sheng Hung Pei-Pei Ding A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface International Journal of Rotating Machinery Convex surface Film cooling Liquid crystal thermography. |
| title | A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface |
| title_full | A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface |
| title_fullStr | A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface |
| title_full_unstemmed | A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface |
| title_short | A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface |
| title_sort | transient method using liquid crystal for film cooling over a convex surface |
| topic | Convex surface Film cooling Liquid crystal thermography. |
| url | http://dx.doi.org/10.1155/S1023621X01000148 |
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