Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub>
At an extremely high Mach number, the regenerative cooling of traditional kerosene cannot meet the requirement of the heat sink caused by aerodynamic heating and internal combustion in a scramjet propulsion system. As a supplement of traditional regenerative cooling, supercritical CO<sub>2<...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Aerospace |
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| Online Access: | https://www.mdpi.com/2226-4310/10/6/564 |
| _version_ | 1797596626528763904 |
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| author | Jian Liu Mengyao Xu Pengchao Liu Wenxiong Xi |
| author_facet | Jian Liu Mengyao Xu Pengchao Liu Wenxiong Xi |
| author_sort | Jian Liu |
| collection | DOAJ |
| description | At an extremely high Mach number, the regenerative cooling of traditional kerosene cannot meet the requirement of the heat sink caused by aerodynamic heating and internal combustion in a scramjet propulsion system. As a supplement of traditional regenerative cooling, supercritical CO<sub>2</sub> is regarded as an effective coolant in severe heating environments due to its excellent properties of heat and mass transportation. In this paper, the heat transfer and flow structure characteristics of regenerative cooling in a rectangular channel using supercritical CO<sub>2</sub> are analyzed numerically using a validated model. The effect of heat flux magnitude, nonuniform heat flux, acceleration and buoyancy and flow pattern are considered to reveal the regenerative cooling mechanism of supercritical CO<sub>2</sub> in the engine condition of a scramjet. The results indicate that the heat transfer deterioration phenomenon becomes obvious in the cooling channel loaded with relatively high heat flux. Compared with the cooling channels loaded with increased heat flux distribution, the maximum temperature increased for the channel loaded with decreased heat flux distributions. When larger acceleration is applied, a relatively lower wall temperature distribution and higher heat transfer coefficients are obtained. The wall temperature distribution becomes more uniform and the high-temperature region is weakened when the coolants in adjacent channels are arranged as a reversed flow pattern. Overall, the paper provides some references for the utilization of supercritical CO<sub>2</sub> in regenerative cooling at an extremely high Mach number in a scramjet. |
| first_indexed | 2024-03-11T02:52:51Z |
| format | Article |
| id | doaj.art-6e4531184c744ffc8e64bcfa99d06a83 |
| institution | Directory Open Access Journal |
| issn | 2226-4310 |
| language | English |
| last_indexed | 2024-03-11T02:52:51Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Aerospace |
| spelling | doaj.art-6e4531184c744ffc8e64bcfa99d06a832023-11-18T08:50:22ZengMDPI AGAerospace2226-43102023-06-0110656410.3390/aerospace10060564Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub>Jian Liu0Mengyao Xu1Pengchao Liu2Wenxiong Xi3Research Institute of Aerospace Technology, Central South University, Changsha 410012, ChinaResearch Institute of Aerospace Technology, Central South University, Changsha 410012, ChinaResearch Institute of Aerospace Technology, Central South University, Changsha 410012, ChinaResearch Institute of Aerospace Technology, Central South University, Changsha 410012, ChinaAt an extremely high Mach number, the regenerative cooling of traditional kerosene cannot meet the requirement of the heat sink caused by aerodynamic heating and internal combustion in a scramjet propulsion system. As a supplement of traditional regenerative cooling, supercritical CO<sub>2</sub> is regarded as an effective coolant in severe heating environments due to its excellent properties of heat and mass transportation. In this paper, the heat transfer and flow structure characteristics of regenerative cooling in a rectangular channel using supercritical CO<sub>2</sub> are analyzed numerically using a validated model. The effect of heat flux magnitude, nonuniform heat flux, acceleration and buoyancy and flow pattern are considered to reveal the regenerative cooling mechanism of supercritical CO<sub>2</sub> in the engine condition of a scramjet. The results indicate that the heat transfer deterioration phenomenon becomes obvious in the cooling channel loaded with relatively high heat flux. Compared with the cooling channels loaded with increased heat flux distribution, the maximum temperature increased for the channel loaded with decreased heat flux distributions. When larger acceleration is applied, a relatively lower wall temperature distribution and higher heat transfer coefficients are obtained. The wall temperature distribution becomes more uniform and the high-temperature region is weakened when the coolants in adjacent channels are arranged as a reversed flow pattern. Overall, the paper provides some references for the utilization of supercritical CO<sub>2</sub> in regenerative cooling at an extremely high Mach number in a scramjet.https://www.mdpi.com/2226-4310/10/6/564regenerative coolingsupercritical CO<sub>2</sub>heat fluxaccelerationflow pattern |
| spellingShingle | Jian Liu Mengyao Xu Pengchao Liu Wenxiong Xi Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub> Aerospace regenerative cooling supercritical CO<sub>2</sub> heat flux acceleration flow pattern |
| title | Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub> |
| title_full | Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub> |
| title_fullStr | Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub> |
| title_full_unstemmed | Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub> |
| title_short | Heat Transfer and Flow Structure Characteristics of Regenerative Cooling in a Rectangular Channel Using Supercritical CO<sub>2</sub> |
| title_sort | heat transfer and flow structure characteristics of regenerative cooling in a rectangular channel using supercritical co sub 2 sub |
| topic | regenerative cooling supercritical CO<sub>2</sub> heat flux acceleration flow pattern |
| url | https://www.mdpi.com/2226-4310/10/6/564 |
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