Effect of film cooling structures on the cooling characteristics of plugs for two-dimensional (2-D) plug nozzle

Chen, Jing; Shan, Yongkui; Zhang, Xuyong; Zhang, Jingzhou

doi:10.1016/j.ijthermalsci.2023.108444

Cited by 1 publication

(7 citation statements)

References 22 publications

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“…But the temperature increases again after passing through the shock. This is basically the same as the non-dimensional temperature distribution trend of the 2D plug surface in reference [18]. The temperature decreases as the mainstream leaves the plug surface and gradually mixes with the external airflow.…”

Section: Analysis Of the Aerodynamic Characteristics Of The Baseline ...supporting

confidence: 65%

“…The commercial CFD solver Fluent 19.2 was used for numerical calculations. Reference [18] verified that the two-dimensional (2-D) plug nozzle film cooling results calculated by SST kω model were in good agreement with the experimental results. The SST k-ω model can effectively simulate Reynolds stress, accurately model separation phenomena under adverse pressure gradients, and exhibit good simulation performance in both near-surface and far-from-surface regions [30].…”

Section: Turbulence Model and Grid Independence Verificationsupporting

confidence: 60%

“…η eff is an important parameter for the cooling effectiveness of the film cooling, Nu number is an important dimensionless number reflecting convective heat transfer capacity [29], while C f and σ are important parameters that reflect the aerodynamic performance of engine exhaust system [18]. To assess the cooling effectiveness of the plug surface and the aerodynamic performance of the nozzle, this paper defines the following characteristic parameters.…”

Section: Characteristic Parameters Definitionmentioning

confidence: 99%

“…Although there is a low-temperature region on the rear surface of the plug after passing through the expansion fan, the overall temperature of the plug surface remains relatively high. surface in reference [18]. The temperature decreases as the mainstream leaves the plug surface and gradually mixes with the external airflow.…”

Section: Analysis Of the Aerodynamic Characteristics Of The Baseline ...mentioning

confidence: 99%

“…There is limited research on the impact of film cooling structures on the aerodynamic performance and heat transfer characteristics of axisymmetric plug nozzle. Jing Chen et al [18] conducted a numerical simulation to study the aerodynamic and cooling characteristics of a two-dimensional plug nozzle. Research results showed that the film cooling structure of stagger film holes for plug nozzle cooling has a good effect.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Influence of Film Cooling Structure on the Flow and Heat Transfer Characteristics of Axisymmetric Plug Nozzle

Ma,

Zhang,

Bai

2024

Symmetry

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Some numerical simulations were used to study the effects of blowing ratio (0.25–0.5), hole diameters(0.65~1 mm), and hole inclination angle (30~60°) of the film cooling structure on the cooling and aerodynamic characteristics of the axisymmetric plug nozzle under the condition of transonic. The results showed that the bow shocks appear near the film holes on the plug wall in the supersonic region, which cause the wall cooling effectiveness of the plug to decrease. Compared with the baseline plug, the blowing ratio ranged from 0.25 to 0.5, the wall average temperature of the rear plug decreased by 34.4~48.1%, the thrust coefficient and total pressure recovery coefficient decreased by 0.31~0.61% and 0.52~0.93%, respectively. When the perforated percentage is constant, the wall cooling effectiveness increases with the decrease of the hole diameters. The increase in the inclination angle of the film holes lead to the decrease in cooling effectiveness and aerodynamic performance. This is because the penetration ability of the cooling air to the mainstream is enhanced, and the obstruction to the mainstream boundary layer is increased, resulting in the increase of bow shock intensity near the film holes in the supersonic region.

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Section: Analysis Of the Aerodynamic Characteristics Of The Baseline ...supporting

confidence: 65%

Section: Turbulence Model and Grid Independence Verificationsupporting

confidence: 60%

Section: Characteristic Parameters Definitionmentioning

confidence: 99%

Section: Analysis Of the Aerodynamic Characteristics Of The Baseline ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on the Influence of Film Cooling Structure on the Flow and Heat Transfer Characteristics of Axisymmetric Plug Nozzle

Ma,

Zhang,

Bai

2024

Symmetry

View full text Add to dashboard Cite

show abstract

Effect of film cooling structures on the cooling characteristics of plugs for two-dimensional (2-D) plug nozzle

Cited by 1 publication

References 22 publications

Investigation on the Influence of Film Cooling Structure on the Flow and Heat Transfer Characteristics of Axisymmetric Plug Nozzle

Investigation on the Influence of Film Cooling Structure on the Flow and Heat Transfer Characteristics of Axisymmetric Plug Nozzle

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