Film cooling performance evaluation of the furcate hole with cross-flow coolant injection: A comparative study

Liu, Cun-liang; Lin, Yuzhen; Zhang, Fan; Huang, Rong Fung; Li, Bingran

doi:10.1016/j.ijheatmasstransfer.2020.120457

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…A ramped vortex generator was placed downstream of the cooling hole for terminating the CRVP progression via creating a new vortex pair; thus, the coolant was positioned close to the wall surface and stretched further downstream [5]. Recently, the film cooling performance (FCP) of a novel furcate hole was examined, and it was found that the lateral coverage of the coolant was more comprehensive than that of the traditional cylindrical holes [6]. Generally, all of the aforementioned approaches are passive flow control techniques and are limited, and the dynamic nature of the film cooling flow requires a flow control technique, which could be adjusted in real-time in the course of the flow state, emphasizing the demand for an active film cooling control technique.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Pulsed Film Cooling with a Dielectric Barrier Discharge Plasma Actuator

Shen,

Hu,

et al. 2023

Aerospace

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The effects of the coolant pulsation and the plasma aerodynamic actuation (PAA) on the film cooling are herein explored via large eddy simulations. The electrohydrodynamic force derived from the PAA was solved through the phenomenological plasma model. The Strouhal number of the sinusoidal coolant pulsation and the averaged pulsation blowing ratio were 0.25 and 1.0, respectively. Comprehensive analyses were carried out on the time-averaged flow fields, and the results reveal that the pulsed cooling jet might cause a deeper penetration into the crossflow, and this phenomenon could be remarkably mitigated by the downward force of the PAA. Comparing steady film cooling to pulsed film cooling revealed a modest 15.1% reduction in efficiency, while the application of the dielectric barrier discharge plasma actuator (DBDPA) substantially enhanced the pulsed film cooling efficiency by 42.1%. Moreover, the counter-rotating vortex pair (CRVP) was enlarged and lifted off from the wall more poorly due to the coolant pulsation, and the PAA weakened the detrimental lift-off effect and entrainment of the CRVP. Then, the spatial–temporal development of the coherent structures was figured out by the alterations in the centerline temperature, reflecting the formation of the intermittent coherent structures rather than hairpin vortices due to the coolant pulsation, and their size and upcast behaviors were reduced by the PAA; thus, the turbulent integration of the coolant with the crossflow was suppressed fundamentally. Finally, the three-dimensional streamlines confirmed that the coherent structure dynamic behaviors were significantly regulated by the PAA for alleviating the adverse influences of the coolant pulsation. In summary, the PAA can effectively improve the pulsed film cooling efficiency by controlling the spatial–temporal development of the dominant coherent structures.

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Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Pulsed Film Cooling with a Dielectric Barrier Discharge Plasma Actuator

Shen,

Hu,

et al. 2023

Aerospace

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“…In order to suppress the generation of CVP and weaken the associated undesirable effects, many kinds of active and passive control [8][9][10][11][12][13][14][15][16][17][18] have been proposed. Among the active control methods, the key parameters mainly include jet flow frequency [8,9], intensity of freestream turbulence [10,11], density ratio [11,12], and blowing ratio [13].…”

Section: Introductionmentioning

confidence: 99%

“…Among the active control methods, the key parameters mainly include jet flow frequency [8,9], intensity of freestream turbulence [10,11], density ratio [11,12], and blowing ratio [13]. As for passive control, geometrical shape of film cooling hole [14][15][16] and geometrical parameters of upstream obstacle [17,18] receive lots of attention. The results indicate that the application of a shaped hole or upstream obstacle can suppress the generation of CVP, and hence, weaken the lift-off of coolant jet and its undesirable effect on film cooling performance.…”

Section: Introductionmentioning

confidence: 99%

An LBM-Based Investigation on the Mixing Mechanism of Double Rows Film Cooling with the Combination of Forward and Backward Jets

Shangguan

Cao

2022

Energies

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Film cooling has been widely applied to the highly efficient thermal protection of gas turbines. By using the simplified thermal lattice Boltzmann method (STLBM), a series of large-scale simulations of film cooling are performed to dig up the mixing mechanism of double rows film cooling with the combination of forward and backward jets at the first attempt. The combination of an upstream row with forward jet and a downstream row with backward jet is considered. The Reynolds number is 4000. The blowing ratio of the upstream coolant jet is fixed as BR1=0.5. For the downstream coolant jet (BR2), five values ranging from 0.2–0.8 are considered. The inclination angles of forward jet and backward jet are 35° and 145°, respectively. The numerical results reveal that the performance of film cooling is greatly improved by backward downstream jet due to the suppression of counterrotating vortex pair (CVP). Moreover, the flow structure is changed with the blowing ratio of backward jet. An anti-CVP having the opposite rotational direction to CVP appears as the blowing ratio of backward jet is large. The special flow structure weakens the adverse effect of CVP and transports much coolant jet to the cooled wall. Correspondingly, the time-averaged film cooling effectiveness is increased and the fluctuation of film cooling effectiveness is decreased. All of these indicate that a backward downstream jet with a large blowing ratio improves film cooling performance. The results obtained in this work help to the optimization of film cooling scheme, which also benefit the promotion and application of STLBM in gas turbine engineering.

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Assessing the effect of swirl flow on the film cooling effectiveness of a vane pressure surface

Song,

Ye,

Wang

et al. 2025

International Communications in Heat and Mass Transfer

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Film cooling performance evaluation of the furcate hole with cross-flow coolant injection: A comparative study

Cited by 12 publications

References 34 publications

Large Eddy Simulation of Pulsed Film Cooling with a Dielectric Barrier Discharge Plasma Actuator

Large Eddy Simulation of Pulsed Film Cooling with a Dielectric Barrier Discharge Plasma Actuator

An LBM-Based Investigation on the Mixing Mechanism of Double Rows Film Cooling with the Combination of Forward and Backward Jets

Assessing the effect of swirl flow on the film cooling effectiveness of a vane pressure surface

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