Experimental investigation on film cooling performance of pressure side in annular cascades

Li, Guoqing; Deng, Hongwu

doi:10.1007/s11630-011-0445-x

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Acharya [3] made a comprehensive review on lots of numerical works of film cooling during recent twenty years. No matter experimental or numerical works, most of them are concerned about the effects of various aerodynamic and geometrical parameters, such as blowing ratio, inclination angle, the shape of film cooling hole and compound angle on cooling performance [4][5][6][7][8]. However, there seems few studies on the influencing mechanism of these parameters and the evolutionary mechanism of coherent structure, which are pivotal and theoretical problems for film-cooling investigation.…”

Section: Introductionmentioning

confidence: 99%

High resolution simulation of film cooling with blowing ratio and inclination angle effects based on hybrid thermal lattice Boltzmann method

et al. 2022

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A series of high-resolution simulations on film cooling with varying blowing ratios and inclination angles are carried out by using in-house code based on hybrid thermal lattice Boltzmann method. Three blowing ratios ranging from 0.2 to 0.8 and four inclination angles from 15? to 60? are chosen for the simulations. The evolutionary mechanism of coherent structure in three domains of film-covering region is studied from the view of space and time. Besides, the influencing mechanism of blowing ratio and inclination angle on flow and heat-transfer features of film cooling is uncovered. Results show that hairpin vortex, hairpin packet and quasi-stream-wise vortex appearing in rotating domain play a key role in heat-transfer process of film cooling. The strong ejection, sweep and vortex rotation resulted from these vortices enhance the convective heat transfer. It is also found that the size of coherent structure varies significantly with blowing ratio and its integral form shows a strong dependence on inclination angle. Moreover, inclination angle of coolant jet has a significant impact on turbulence fluctuation intensity. The influence of blowing ratio on the attachment of coolant film and film-cooling performance is more obvious than that of inclination angle. It is believed that all of these are related closely to the variation of stream-wise and wall-normal jet velocity in the case of various blowing ratios and inclination angles.

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Section: Introductionmentioning

confidence: 99%

High resolution simulation of film cooling with blowing ratio and inclination angle effects based on hybrid thermal lattice Boltzmann method

et al. 2022

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“…Eckert (1970), has studied experimentally, the effect of the blowing ratio for the gas-to-gas film cooling in a cylindrical hole with air as a coolant fluid; this is one of the early works done in film cooling. In most studies, the film cooling effectiveness for small blowing ratios has been studied and it has been shown that by increasing the blowing ratio, the film cooling effectiveness increases (Li and Deng, 2011; Tao et al , 2011).…”

Section: Introductionmentioning

confidence: 99%

Optimization of the blowing ratio for film cooling on a flat plate

Kelishami

Lakzian

2017

HFF

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Purpose The purpose of this paper is to report the result of a numerical investigation of film cooling performance on a flat plate for finding optimum blowing ratios. Design/methodology/approach Steady-state simulations have been performed, and the flow has been considered incompressible. Calculations have been performed with 3D finite-volume method and the k-e turbulence model. Findings The adiabatic film cooling effectiveness and the effects of density ratio (DR), blowing ratio (M) and main stream turbulence intensity (Tu), coolant penetration, hole incline and diameter are studied. The temperature and film cooling effectiveness contours, centerline and laterally film cooling effectiveness are presented for these cases. Results show that the cases with smaller Tu have better effectiveness. In the console, using the air coolant and in cylindrical hole cases, using CO2 coolant fluid has higher effectiveness. The results indicated that there is an optimum blowing ratio in the cylindrical hole cases to optimize the performance of new gas turbines. Research limitations/implications Investigation of optimum blowing ratio for the convex surfaces and turbine blades is a prospective topic for future studies. Practical implications The motivation of this study comes from several industrial applications such as film cooling of gas turbine components. This research gives the best blowing ratio for receiving maximum cooling effectiveness with minimum coolant velocity. Originality/value This study optimizes the blowing ratio for film cooling on a flat plate.

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“…Both the heat transfer coefficient and cooling effectiveness increase with Reynolds number. Li et al [7] investigated the film cooling characteristics in annular turbine cascades using thermochromic liquid crystal (TLC). Results showed that the film coverage and cooling effectiveness increase with the rising of mainstream Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Film cooling performance in a low speed 1.5-stage turbine: effects of mainstream Reynolds number and turbulence

Zhu

Wang

et al. 2014

Heat Mass Transfer

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The effects of mainstream Reynolds number and turbulence to film cooling performance were investigated experimentally and computationally under rotating conditions in a 1.5-stage turbine. The rotor of the turbine included 18 blades with chord of 124.3 mm and height of 99 mm. A film hole was set in the middle span of the rotor blade surface with injection angles of 28°on the pressure side and 36°on the suction side respectively. The Reynolds number based on the mainstream velocity of the turbine outlet and the chord length of the rotor blade varied from 1.9 9 10 5 to 2.1 9 10 5 . Measurements were made at three different rotation speeds of 702, 737 and 800 rpm to keep the rotating number consistent at 0.0280 while the blowing ratio varied from 0.5 to 2.0. Air and CO 2 worked as coolant to achieve the density ratio of 1.03 and 1.57, respectively. Computational investigation was performed using the hexahedral structured grids and k-e turbulence model. Results showed that the film coverage and cooling effectiveness are enlarged while the film deflection is weakened as the mainstream Reynolds number increases. Furthermore, the mainstream turbulence plays a negative role in the film coverage and cooling effectiveness at lower blowing ratio on both the pressure side and suction side while it promotes the film reattachment at higher blowing ratio on the suction side.

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Experimental investigation on film cooling performance of pressure side in annular cascades

Cited by 8 publications

References 18 publications

High resolution simulation of film cooling with blowing ratio and inclination angle effects based on hybrid thermal lattice Boltzmann method

High resolution simulation of film cooling with blowing ratio and inclination angle effects based on hybrid thermal lattice Boltzmann method

Optimization of the blowing ratio for film cooling on a flat plate

Film cooling performance in a low speed 1.5-stage turbine: effects of mainstream Reynolds number and turbulence

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