Experimental research on the thermal performance of converging slot holes with different divergence angles

Liu, Cun-liang; Zhu, Hui-ren; Bai, Jiang-tao; Xu, Dan

doi:10.1016/j.expthermflusci.2009.02.010

Cited by 39 publications

(4 citation statements)

References 27 publications

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“…Detailed flow structures of console film cooling flow field were also investigated by Azzi and Jubran [17] and Yao et al [18] through numerical simulations. Liu et al [19,20] further investigated the effect of console geometry variants including exit-entry area ratio and divergence angle on the film cooling performance of the consoles. The investigations showed that properly changing the geometry parameters of the console could improve the film cooling performance.…”

Section: Introductionmentioning

confidence: 99%

Investigation on film cooling characteristics from a row of converging slot-holes on flat plate

Yao

Zhang

2011

Sci. China Technol. Sci.

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Experimental and numerical researches were conducted to investigate the cooling performance of a single row of consoles (converging slot-hole) on a large-scale flat-plate model. The results show that the coolant flow from a row of consoles shows good lateral uniformity of adiabatic effectiveness, with regions of slightly enhanced cooling occurring between the consoles. For the console cooling geometry, the interaction between coolant jet from inclined console and the mainstream flow results in reasonable vortices configuration. A pair of counter rotating vortices originate from the edge of slot, not from the centerline of film holes and the rotating direction is contrary to conventional cylindrical hole. The heat transfer coefficient ratio is a little bigger for the console case than conventional cylindrical hole, and the discharge coefficient for a console is larger than that for cylindrical film cooling hole. film cooling, converging slot-hole, cooling effectiveness, heat transfer coefficient, discharge coefficient Citation:

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Section: Introductionmentioning

confidence: 99%

Investigation on film cooling characteristics from a row of converging slot-holes on flat plate

Yao

Zhang

2011

Sci. China Technol. Sci.

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“…Azzi et al [14] and Yao et al [15][16][17] found that the anti-kidney vortices formed downstream of the console are the key factors to improve film cooling effectiveness. Liu et al [18][19] investigated the influence of the different divergence angles and area ratios of exit-entry on the film cooling performance of the console. The results show that adjusting the geometric parameters of console properly could make the film cooling effect improved.…”

Section: Introductionmentioning

confidence: 99%

Influence of converging slot-holes (consoles) with different transition surfaces on film cooling performance

Xuan

2022

J. Phys.: Conf. Ser.

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To investigate the influence of the transition surfaces of consoles on film cooling performance, a series of numerical simulations were performed under two typical blowing ratio (M). Four different consoles were designed by changing the transition surface of the console, and their film cooling performance was studied under the same boundary conditions. The purpose of the present work is to determine the best configuration of the transition surface. The results show that whether at M=0.5 or M=1.0, compared with the reference case, the console with anti-s-shaped transition surface has the best spatially-averaged adiabatic film cooling effectiveness (ηad,av ), and the ηad,av is improved by 6.4% and 7.0% respectively, meanwhile, the discharge coefficient (Cd ) is decreased by 2.9% and 3.2% respectively. Besides, the detailed flow and heat transfer mechanism of consoles with different transition surfaces under different blowing ratios are also investigated.

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“…This specific flow structure has excellent potential in the enhancement of film cooling, because it could suppress the normal penetration of cooling flow into the primary flow and prevent the lateral invasion of the primary flow into the film layer. Liu et al [21,22] experimentally studied the influence of console exit-entry area ratio and lateral expansion angle on the thermal and film cooling performances. They pointed out that the consoles with smaller area ratio of exit and entry have smaller discharge coefficient and larger film cooling effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Round-to-Slot Holes on Film-Cooling Performance in a Turbine Vane

Huang¹,

Peng²,

Zhang

et al. 2022

J. Phys.: Conf. Ser.

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The numerical investigation of single row holes on suction surface and pressure surface of a scaled turbine guide vane is carried out. In particular, the effects of round-to-slot holes (RTSHs) on film cooling performance are illustrated. Four RTSHs with different exit-to-inlet area ratios are considered under different blowing ratios. The results show that RTSHs can suppress the normal penetration of cooling jet and broadening the lateral coverage of film layer. With the increase of slot aspect ratio, the anti-kidney vortices pair is generally strengthened, making the film cooling improvement more significantly. The film cooling improving effects of shaped holes on the pressure surface is better than that on the suction surface, particularly under high blowing ratios. A key factor affecting the bleed pressure of coolant flow is exit-inlet area ratio of RTSH. The equivalent-area RTSH achieves nearly the same discharge coefficient (Cd) as the cylindrical hole. Viewed from the comprehensive effects of the Cd and adiabatic film cooling effectiveness on shaped hole, the RTSH-3 with a slot aspect of 9 and an exit-inlet area ratio of 1.27 is suggested to be the most favorable film-hole geometry among the current shaped-holes, either on the pressure surface or on the suction surface.

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Experimental research on the thermal performance of converging slot holes with different divergence angles

Cited by 39 publications

References 27 publications

Investigation on film cooling characteristics from a row of converging slot-holes on flat plate

Investigation on film cooling characteristics from a row of converging slot-holes on flat plate

Influence of converging slot-holes (consoles) with different transition surfaces on film cooling performance

Numerical Investigation of Round-to-Slot Holes on Film-Cooling Performance in a Turbine Vane

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