Effect of shocks on film cooling of a full scale turbojet exhaust nozzle having an external expansion surface

Straight, D. M.

doi:10.2514/6.1979-1170

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…The conclusion showed that an increase in turbulivity significantly reduced the film cooling effectiveness. Straight [7] explored the film cooling characteristics of an axisymmetric nozzle. They found that shock waves appeared downstream of the cooling groove when the flow inside the nozzle reached supersonic speed, which had a great impact on the film cooling effectiveness.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Film Cooling under the Effects of Different Adverse Pressure Gradients

Shi,

Hui,

Zhou

et al. 2024

Aerospace

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Film cooling needs to be applied to serpentine nozzles due to an increase in thermal load. Adverse pressure gradients (APGs) near the upper wall of such nozzles hinder the forward flow of the coolant, and they may even induce a recirculation zone that complicates the cooling of the film in serpentine nozzles under different APGs. In this study, the film cooling characteristics of a serpentine nozzle under various APGs are investigated through numerical simulations. The studied pressure gradients include strong, moderate, and weak APGs. The results show that the APG weakened the adhesion of the coolant to the surface, thereby reducing the film cooling effectiveness (FCE) and the convective heat transfer coefficient (CHTC). The stronger the APG, the greater its obstructive effect. However, the recirculation zone induced by the strong APG was composed of the coolant, and it adhered tightly to the wall, thereby significantly strengthening the FCE and CHTC. The CHTC under the moderate APG significantly increased due to the convergence of two jets ejected from different holes. For the four blowing ratios, the area-averaged FCE under the strong APG was 29.8% and 24.5% higher than that under the moderate and weak APGs, while the area-averaged ratios of the CHTC under the moderate APG were 1.6% and 16.7% higher than those under the strong and weak APGs. Therefore, more holes should be arranged on the film in the zones of moderate and weak APGs.

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Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Film Cooling under the Effects of Different Adverse Pressure Gradients

Shi,

Hui,

Zhou

et al. 2024

Aerospace

View full text Add to dashboard Cite

show abstract

“…This subsonic film was chosen because of the impracticality of velocity matching the film flow with the high velocity (~ 1km/s) main flow. Using film cooling design tools available in the literature [9][10][11][12] , we have selected a slot height of 2.3 mm and a film velocity of 130 m/s to hold the AR-coated window surface temperature below 450 K in the presence of free stream gas temperatures up to 2000 K.…”

Section: Simultaneous Water Vapor Mass Flux and Thermometrymentioning

confidence: 99%

Diode laser sensors for aeroengines - Lessons learned and future promises

Allen

Miller

Upschulte

1998

20th AIAA Advanced Measurement and Ground Testing Technology Conference

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Near-IR diode laser sensors are being applied to practical aeroengine tests in both ground and flight applications. Sensors for inlet air mass flux, combustor temperature and product exhaust mass flux, and trace pollutant emissions are described and the current state of testing presented. Practical issues associated with long-term stability, optical access, and effects of flow distortions and non-uniform flow properties are discussed in detail.

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Schubdüsen

Rick¹

2013

Gasturbinen Und Flugantriebe

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Effect of shocks on film cooling of a full scale turbojet exhaust nozzle having an external expansion surface

Cited by 7 publications

References 4 publications

A Numerical Investigation of Film Cooling under the Effects of Different Adverse Pressure Gradients

A Numerical Investigation of Film Cooling under the Effects of Different Adverse Pressure Gradients

Diode laser sensors for aeroengines - Lessons learned and future promises

Schubdüsen

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