Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles
An axisymmetric model scramjet assisted with cavity flameholder is numerically investigated. Three-dimensional Reynolds-averaged Navier-Stokes simulation is carried out to reveal the fuel mixing and combustion characteristics. The simulation results show reasonable agreements with experimental data....
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/7525824 |
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| _version_ | 1832545973387132928 |
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| author | Guangwei Ma Mingbo Sun Guoyan Zhao Pei Liu Tao Tang Li Fan Hongbo Wang |
| author_facet | Guangwei Ma Mingbo Sun Guoyan Zhao Pei Liu Tao Tang Li Fan Hongbo Wang |
| author_sort | Guangwei Ma |
| collection | DOAJ |
| description | An axisymmetric model scramjet assisted with cavity flameholder is numerically investigated. Three-dimensional Reynolds-averaged Navier-Stokes simulation is carried out to reveal the fuel mixing and combustion characteristics. The simulation results show reasonable agreements with experimental data. The analysis indicates that the axisymmetric and rectangular scramjet has some similarities to the cavity shear layer in the nonreacting flow field. The configuration of the cavity shear layer changes hugely due to the significant chemical reaction and heat release in the reacting flow field. Typically, two more configurations with different cavity aft wall angles are compared with the experimental configuration to optimize the configuration of the cavity. When the cavity aft wall angle is small, the cavity shear layer bends to the cavity floor and more fuel enters into and stays in the cavity, which results in poor fuel mixing performance. With the increase of the aft wall angle, the fuel distributes more uniformly and the fuel mixing efficiency improves. In the reacting flow field, the volume of the cavity full of hot products and free radicals increases while the interaction between the cavity and main flow decreases with the increase of the aft wall angle. The improved combustion efficiency shows that larger cavity volume weighs more than reduced interaction between the cavity and main flow. The combustion is more violent in the case with a larger aft wall angle. Therefore, a proper increase of the aft wall angle is beneficial to the performance of cavity-assisted axisymmetric scramjet when designing the cavity flameholder. |
| format | Article |
| id | doaj-art-223c57b101584f2a9db76f70a9ac1af5 |
| institution | Kabale University |
| issn | 1687-5966 1687-5974 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Aerospace Engineering |
| spelling | doaj-art-223c57b101584f2a9db76f70a9ac1af52025-02-03T07:24:11ZengWileyInternational Journal of Aerospace Engineering1687-59661687-59742021-01-01202110.1155/2021/75258247525824Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall AnglesGuangwei Ma0Mingbo Sun1Guoyan Zhao2Pei Liu3Tao Tang4Li Fan5Hongbo Wang6Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, ChinaAn axisymmetric model scramjet assisted with cavity flameholder is numerically investigated. Three-dimensional Reynolds-averaged Navier-Stokes simulation is carried out to reveal the fuel mixing and combustion characteristics. The simulation results show reasonable agreements with experimental data. The analysis indicates that the axisymmetric and rectangular scramjet has some similarities to the cavity shear layer in the nonreacting flow field. The configuration of the cavity shear layer changes hugely due to the significant chemical reaction and heat release in the reacting flow field. Typically, two more configurations with different cavity aft wall angles are compared with the experimental configuration to optimize the configuration of the cavity. When the cavity aft wall angle is small, the cavity shear layer bends to the cavity floor and more fuel enters into and stays in the cavity, which results in poor fuel mixing performance. With the increase of the aft wall angle, the fuel distributes more uniformly and the fuel mixing efficiency improves. In the reacting flow field, the volume of the cavity full of hot products and free radicals increases while the interaction between the cavity and main flow decreases with the increase of the aft wall angle. The improved combustion efficiency shows that larger cavity volume weighs more than reduced interaction between the cavity and main flow. The combustion is more violent in the case with a larger aft wall angle. Therefore, a proper increase of the aft wall angle is beneficial to the performance of cavity-assisted axisymmetric scramjet when designing the cavity flameholder.http://dx.doi.org/10.1155/2021/7525824 |
| spellingShingle | Guangwei Ma Mingbo Sun Guoyan Zhao Pei Liu Tao Tang Li Fan Hongbo Wang Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles International Journal of Aerospace Engineering |
| title | Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles |
| title_full | Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles |
| title_fullStr | Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles |
| title_full_unstemmed | Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles |
| title_short | Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles |
| title_sort | numerical investigation of an axisymmetric model scramjet assisted with cavity of different aft wall angles |
| url | http://dx.doi.org/10.1155/2021/7525824 |
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