Cooling effectiveness of effusion walls with deflection hole angles measured by infrared imaging

Zhang, Chi; Lin, Yuzhen; Xu, Qian; Gao-en, Liu; Song, Bo

doi:10.1016/j.applthermaleng.2008.05.011

Cited by 27 publications

(5 citation statements)

References 8 publications

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“…However, the use of such a correction was considered to be complex, and Reynolds Stress Models appeared as more suitable candidates to describe the acknowledged anisotropy more accurately. Arroyo [12] showed the ability of DRSM RANS models to reproduce the adiabatic effectiveness map, obtained by Zhang et al [8]. The agreement obtained for the k-ω SST model was also judged satisfactory.…”

Section: Introductionmentioning

confidence: 65%

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A Combined Experimental and Numerical Characterization of the Flowfield and Heat Transfer around a Multiperforated Plate with Compound Angle Injection

Laroche¹,

Donjat²,

Reulet³

2021

Energies

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The aerodynamic and thermal behaviour of multiperforated zones in combustors is essential to the development of future combustion chambers. Detailed databases are therefore crucial for the validation of RANS/LES solvers, but also regarding the derivation of heat transfer correlations used in 0D/1D in-house codes developed by engine manufacturers. In the framework of FP7 EU SOPRANO Program, the test-rig used in a previous study is modified to be compatible with anisothermal conditions. The plate studied is a 12:1 model with a 90∘ compound angle injection. A heating system is used to generate a moderate temperature gradient of about 20 K between the secondary hot flow and the main cold flow. The aerodynamic field is acquired by a PIV 2D-3C (Stereo Particle Image Velocimetry) system. The surface heat transfer coefficient is derived based on surface temperature distribution acquisitions. Several heating power levels are tested, which allows evaluating the convective heat transfer coefficient and reference temperature through a linear regression. Measurements are conducted on both sides of the plate, which also gives access to those quantities on the injection/suction sides. From a numerical point of view, the configuration is studied using the unstructured ONERA in-house CEDRE solver with an advanced Reynolds Stress Model. A systematic comparison is presented between the experimental and numerical database. Due to the high blowing ratio, the film protection is low in the first rows, with a convective heat transfer coefficient enhancement around three, and freestream cold air brought close to the wall by vortices created at injection. After four rows, the film is building up, leading gradually to a better insulation of the wall. The comparison with the numerical simulation exhibits a qualitative agreement on the main flow structures. However, the mixing between the jets, the film and the freestream is underestimated by the calculation.

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Section: Introductionmentioning

confidence: 65%

“…Michel [7] documented the flowfield around 12:1 scale holes with 90 • injection, using Laser Doppler Velocimetry and Particle Image Velocimetry. More recently Zhang et al [8] compared different patterns of compound angle holes on overall film cooling effectiveness.…”

Section: Introductionmentioning

confidence: 99%

A Combined Experimental and Numerical Characterization of the Flowfield and Heat Transfer around a Multiperforated Plate with Compound Angle Injection

Laroche¹,

Donjat²,

Reulet³

2021

Energies

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“…Zhu, Zhang, Tan and Shan, Journal of Thermal Science and Technology, Vol.12, No.2 (2017) Figure 9 presents the adiabatic film cooling effectiveness distributions on the pressure side downstream of the film cooling hole, under rotational speed of n=15,000 rpm and blowing ratio of M local =0.8. Under the rotational case, the adiabatic film cooling effectiveness distribution is most similar to that produced by a row of discrete compound holes with deflection angles under stationary condition (Zhang et al 2009). As the coolant jet is forced to deflect toward blade tip due to the rotational effect, the lateral movement of the coolant jet is enhanced, thus, resulting in larger lateral film coverage in the region adjacent to the film holes relative to the stationary case for the cylindrical hole and fan-shaped hole, as seen in Fig.…”

Section: Rotational Effect On Local Film Coolingmentioning

confidence: 87%

Effect of rotation on film cooling with a single row of shaped holes on blade pressure side

Xingdan

Zhang

Tan

et al. 2017

JTST

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Effect of rotation on film cooling with a single row of shaped holes on blade pressure side Abstract A numerical investigation is performed to illustrate the mutual interaction between coolant jet issuing from shaped film cooling hole and cascade primary flow as well as the resulting film cooling performance under rotational condition. Four various film-hole geometries are utilized for comparison, including the conventional cylindrical hole, fan-shaped hole, converging slot-hole and diffused slot-hole. Results show that a strong radial flow is induced toward blade tip on the pressure side due to the rotational effect, thus affecting the interaction mechanism between the coolant jet and primary flow. In general, rotational effects on film cooling are behaved as two aspects. On one hand, it makes the coolant jet deflect toward blade tip, resulting in lateral film coverage improvement in the region adjacent to the film holes for the cylindrical hole and fan-shaped hole relative to the stationary condition. On the other hand, it weakens the flow momentum of coolant jet along the streamwise direction, causing degradation of local film cooling effectiveness far from the hole-exit except for the zone near blade tip. The shaped-hole performs favorable film cooling enhancement, especially under higher blowing ratio. Relative to the stationary case, film cooling improvement by the film-hole exit shaping is degraded a little under the rotational condition. Among the presented shaped-holes, the converging slot-hole achieves the highest film cooling effectiveness and the diffused slot-hole is the next under the same blowing ratio.

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“…Indeed, the film formation is highly dependent on the way holes are drilled into the liner. In particular, it has been shown that compound angle has a major impact on the film's efficiency [1][2][3]. This angle, if not equal to zero, leads 2 to a non-zero azimuthal velocity component for the cold air injection.…”

Section: Introductionmentioning

confidence: 99%

“…PhD Student, gaetan.crouzy@safrangroup.com 2 Thermomechanical Engineer, fabien.desarnaud@safrangroup.com3 Research Engineer, emmanuel.laroche@onera.fr4 Director of Multi-Physics for Energetics Department, pierre.millan@onera.fr…”

mentioning

confidence: 99%

Numerical modelling of a realistic annular effusion cooling system

Crouzy

Desarnaud

Laroche³

et al. 2019

AIAA Propulsion and Energy 2019 Forum

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An experimental test campaign has been conducted by Safran and ONERA in order to generate a database on an annular effusion cooling system. Different effusion cooling patterns have been tested in various flow field conditions, representative of those encountered in real aeronautical combustors in terms of Reynolds number in the perforations, blowing ratio and momentum ratio. This paper presents the numerical modelling of three tests conducted in the same flow field condition for three effusion cooling patterns, featuring different compound angles: 0°, 45° and 90°. Comparisons are made between the experimental wall temperature measured by infrared thermography and the associated RANS simulations. The cooling efficiency is overestimated by RANS simulations, especially for high compound angle values. Comparisons of the cooling film development mechanisms between these three simulations are presented by analyzing the temperature field close to the multiperforated wall.

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Cooling effectiveness of effusion walls with deflection hole angles measured by infrared imaging

Cited by 27 publications

References 8 publications

A Combined Experimental and Numerical Characterization of the Flowfield and Heat Transfer around a Multiperforated Plate with Compound Angle Injection

A Combined Experimental and Numerical Characterization of the Flowfield and Heat Transfer around a Multiperforated Plate with Compound Angle Injection

Effect of rotation on film cooling with a single row of shaped holes on blade pressure side

Numerical modelling of a realistic annular effusion cooling system

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