Understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gauges
The Oxford Turbine Research Facility (OTRF) is a high-speed rotating transient test facility, which allows unsteady aerodynamic and heat transfer measurements at engine representative conditions. In addition, a variety of inlet temperature profiles can be simulated in the rig including radial distor...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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American Society of Mechanical Engineers
2023
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| _version_ | 1824459092131840000 |
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| author | Singh, D Beard, PF Cardwell, D Chana, KS |
| author_facet | Singh, D Beard, PF Cardwell, D Chana, KS |
| author_sort | Singh, D |
| collection | OXFORD |
| description | The Oxford Turbine Research Facility (OTRF) is a high-speed rotating transient test facility, which allows unsteady aerodynamic and heat transfer measurements at engine representative conditions. In addition, a variety of inlet temperature profiles can be simulated in the rig including radial distortion, circumferential distortion, and swirl. However, the engine representative flows cause complications in the processing of heat transfer data. The unsteadiness in temperature data was found to significantly rise as temperature distortions were introduced in the nozzle guide vane (NGV) inlet profile, to model a lean-burn combustor exit. Using the NGV inlet temperature profile survey data, the thermal unsteadiness has been quantified and compared with a uniform inlet. The experiments with a radially varying NGV inlet temperature profile showed up to nine times higher thermal unsteadiness, compared to the uniform inlet. The second part of the paper is a continuation of the work presented in a previous paper by Singh et al. and describes improved methodologies for derived heat transfer calculations using thin-film gauges. In addition, the uncertainty associated with the derived heat transfer parameters, such as the heat transfer coefficient and adiabatic wall temperature has been quantified. The refined processing techniques have been demonstrated on casing heat transfer measurements, acquired in the OTRF with two inlet temperature profiles. |
| first_indexed | 2025-02-19T04:36:17Z |
| format | Journal article |
| id | oxford-uuid:683b13c3-81b5-4f22-8231-7d2832025304 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2025-02-19T04:36:17Z |
| publishDate | 2023 |
| publisher | American Society of Mechanical Engineers |
| record_format | dspace |
| spelling | oxford-uuid:683b13c3-81b5-4f22-8231-7d28320253042025-02-05T09:34:37ZUnderstanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gaugesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:683b13c3-81b5-4f22-8231-7d2832025304EnglishSymplectic ElementsAmerican Society of Mechanical Engineers2023Singh, DBeard, PFCardwell, DChana, KSThe Oxford Turbine Research Facility (OTRF) is a high-speed rotating transient test facility, which allows unsteady aerodynamic and heat transfer measurements at engine representative conditions. In addition, a variety of inlet temperature profiles can be simulated in the rig including radial distortion, circumferential distortion, and swirl. However, the engine representative flows cause complications in the processing of heat transfer data. The unsteadiness in temperature data was found to significantly rise as temperature distortions were introduced in the nozzle guide vane (NGV) inlet profile, to model a lean-burn combustor exit. Using the NGV inlet temperature profile survey data, the thermal unsteadiness has been quantified and compared with a uniform inlet. The experiments with a radially varying NGV inlet temperature profile showed up to nine times higher thermal unsteadiness, compared to the uniform inlet. The second part of the paper is a continuation of the work presented in a previous paper by Singh et al. and describes improved methodologies for derived heat transfer calculations using thin-film gauges. In addition, the uncertainty associated with the derived heat transfer parameters, such as the heat transfer coefficient and adiabatic wall temperature has been quantified. The refined processing techniques have been demonstrated on casing heat transfer measurements, acquired in the OTRF with two inlet temperature profiles. |
| spellingShingle | Singh, D Beard, PF Cardwell, D Chana, KS Understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gauges |
| title | Understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gauges |
| title_full | Understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gauges |
| title_fullStr | Understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gauges |
| title_full_unstemmed | Understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gauges |
| title_short | Understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin-film gauges |
| title_sort | understanding thermal unsteadiness in engine representative flows and improved methodologies for derived heat transfer calculations using thin film gauges |
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