Heat transfer characteristics of high crossflow impingement channels: Effect of number of holes
In modern turbine airfoils, narrow impingement cooling channels can be formed in a double-wall configuration. In these wall-integrated cooling cavities, the generated crossflow is one of the most important design factors, and hence, the number of impingement holes included in a channel. This study e...
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| Veröffentlicht in: | Proceedings of the Institution of Mechanical Engineers. Part A, Journal of power and energy Journal of power and energy, 2015-08, Vol.229 (5), p.560-568 |
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| container_title | Proceedings of the Institution of Mechanical Engineers. Part A, Journal of power and energy |
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| creator | Llucià, S Terzis, A Ott, P Cochet, M |
| description | In modern turbine airfoils, narrow impingement cooling channels can be formed in a double-wall configuration. In these wall-integrated cooling cavities, the generated crossflow is one of the most important design factors, and hence, the number of impingement holes included in a channel. This study examines experimentally the influence of the number of impingement holes on the heat transfer characteristics of narrow impingement channels. The channels consist of two rows of jets where the number of holes in the axial direction is varied from 5 to 10, maintaining the same jet plate open area. Local heat transfer coefficient distributions are obtained for all channel interior walls using the transient liquid crystal technique and over a range of Reynolds numbers (20,300–41,500). The results show an important heat transfer degradation at higher open areas and a small influence of the number of holes at upstream channel positions. |
| doi_str_mv | 10.1177/0957650915594074 |
| format | Article |
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In these wall-integrated cooling cavities, the generated crossflow is one of the most important design factors, and hence, the number of impingement holes included in a channel. This study examines experimentally the influence of the number of impingement holes on the heat transfer characteristics of narrow impingement channels. The channels consist of two rows of jets where the number of holes in the axial direction is varied from 5 to 10, maintaining the same jet plate open area. Local heat transfer coefficient distributions are obtained for all channel interior walls using the transient liquid crystal technique and over a range of Reynolds numbers (20,300–41,500). 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The results show an important heat transfer degradation at higher open areas and a small influence of the number of holes at upstream channel positions.</description><subject>Channels</subject><subject>Cooling</subject><subject>Fluid dynamics</subject><subject>Heat transfer</subject><subject>Heat transfer coefficients</subject><subject>Holes</subject><subject>Impingement</subject><subject>Mechanical engineers</subject><subject>Reynolds number</subject><subject>Turbines</subject><subject>Walls</subject><issn>0957-6509</issn><issn>2041-2967</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNp1kDFPwzAQhS0EEqWwM0ZiYQnYjq-u2VBVKFIlFpgjxzm3qRKn2I4Q_x6HMqBK3HLDfe_p3SPkmtE7xqS8pwrkDKhiAEpQKU7IhFPBcq5m8pRMxnM-3s_JRQg7mgYkn5ByhTpm0WsXLPrMbLXXJqJvQmxMyHqbbZvNNjO-D8G2_WfWdPvGbbBDF0faOWzDQ7a0Fk0ccTd0VTIahX2L4ZKcWd0GvPrdU_L-tHxbrPL16_PL4nGdm0LwmM9nFeq6tspUVFErAFM6rY0AYVllaA2q0kVhOGgjOUANdc0kGBBGccttMSW3B9-97z8GDLHsmmCwbbXDfgglkwVlnM_lLKE3R-iuH7xL6RJFC5hLxlSi6IH6ed2jLfe-6bT_Khktx8bL48aTJD9Igt7gH9P_-G_UJYD8</recordid><startdate>20150801</startdate><enddate>20150801</enddate><creator>Llucià, S</creator><creator>Terzis, A</creator><creator>Ott, P</creator><creator>Cochet, M</creator><general>SAGE Publications</general><general>SAGE PUBLICATIONS, INC</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7TB</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><scope>7SU</scope><scope>C1K</scope><scope>H8D</scope></search><sort><creationdate>20150801</creationdate><title>Heat transfer characteristics of high crossflow impingement channels: Effect of number of holes</title><author>Llucià, S ; Terzis, A ; Ott, P ; Cochet, M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c342t-86beaddf9cb090f45e572aac454f1bc0d59ba33c25ac7255d5dd175c54c92f2f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Channels</topic><topic>Cooling</topic><topic>Fluid dynamics</topic><topic>Heat transfer</topic><topic>Heat transfer coefficients</topic><topic>Holes</topic><topic>Impingement</topic><topic>Mechanical engineers</topic><topic>Reynolds number</topic><topic>Turbines</topic><topic>Walls</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Llucià, S</creatorcontrib><creatorcontrib>Terzis, A</creatorcontrib><creatorcontrib>Ott, P</creatorcontrib><creatorcontrib>Cochet, M</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environmental Engineering Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Aerospace Database</collection><jtitle>Proceedings of the Institution of Mechanical Engineers. 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In these wall-integrated cooling cavities, the generated crossflow is one of the most important design factors, and hence, the number of impingement holes included in a channel. This study examines experimentally the influence of the number of impingement holes on the heat transfer characteristics of narrow impingement channels. The channels consist of two rows of jets where the number of holes in the axial direction is varied from 5 to 10, maintaining the same jet plate open area. Local heat transfer coefficient distributions are obtained for all channel interior walls using the transient liquid crystal technique and over a range of Reynolds numbers (20,300–41,500). The results show an important heat transfer degradation at higher open areas and a small influence of the number of holes at upstream channel positions.</abstract><cop>London, England</cop><pub>SAGE Publications</pub><doi>10.1177/0957650915594074</doi><tpages>9</tpages></addata></record> |
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| ispartof | Proceedings of the Institution of Mechanical Engineers. Part A, Journal of power and energy, 2015-08, Vol.229 (5), p.560-568 |
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| language | eng |
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| source | SAGE Complete A-Z List |
| subjects | Channels Cooling Fluid dynamics Heat transfer Heat transfer coefficients Holes Impingement Mechanical engineers Reynolds number Turbines Walls |
| title | Heat transfer characteristics of high crossflow impingement channels: Effect of number of holes |
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