Numerical investigation of jet array impingement cooling with effusion holes

Youn, Jun-Suk; Choi, Won-Woo; Kim, Sung-Min

doi:10.1016/j.applthermaleng.2021.117347

Cited by 25 publications

(4 citation statements)

References 32 publications

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“…10 The insulating coverage effect of a perforated impact-jet on the surface of casing with circular cross-section flat cooling air pipe has been explored. 11 Work has also been conducted on the influence of flow mode on the internal heat transfer characteristics of ACC casing in a high-pressure turbine. 12 However, very little research has been conducted on the inlet intake character of an ACC.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic optimization method of intake grille of active clearance control system for turbines based on modified social spider algorithm (MSSA)

Xie,

Zhang,

Shi

et al. 2024

Advances in Mechanical Engineering

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During the operation of an active clearance control (ACC) system of a turbine, the aerodynamic performance of the intake grille indirectly influences its control. To improve the performance, an aerodynamic optimization method is proposed, consisting of parameterization, an optimization algorithm, and a fitness evaluation. During parameterization, its geometry is represented by seven geometric variables. A modified social spider algorithm is used as the optimization algorithm. To evaluate the aerodynamic performance of the grille, a special fitness function is adopted, obtained using an adaptive topological multi-layer feedforward artificial neural network. To verify the feasibility of this method, experiments and numerical calculations are carried out on the original and optimized intake grilles. The results show that the average intake flow rate and average total pressure recovery coefficient of the optimized grille have increased by 17.3% and 4.9%, respectively.

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Section: Introductionmentioning

confidence: 99%

Aerodynamic optimization method of intake grille of active clearance control system for turbines based on modified social spider algorithm (MSSA)

Xie,

Zhang,

Shi

et al. 2024

Advances in Mechanical Engineering

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“…Introducing nanoparticles at a volume fraction of 10% increases all parameters by approximately 10% across lubricant types and rotational speeds. Youn et al (2021) a numerical study was conducted to investigate the HT properties of effusion holes and jet array impingement. The study focused on examining the impact of various parameters on impingement HT using a three-dimensional numerical unit cell model.…”

Section: Introductionmentioning

confidence: 99%

Analysis of melting of phase change material inserted a block via impinging turbulent slot jet

Öztop

Gür

Selimefendigil

et al. 2023

HFF

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Purpose The purpose of this study is to do a numerical analysis of the jet to a body filled with phase change material (PCM). The melting of the PCM filled body was investigated by the hot jet flow. Four different values of the Reynolds number were taken, ranging from 5 × 103 = Re = 12.5 103. Water, Al2O3 1%, Al2O3 2% and hybrid nanofluid (HNF; Al2O3–Ag mixture) were used as fluid types and the effects of fluid type on melting were investigated. At 60 °C, the jet stream was impinged on the PCM filled body at different Reynolds numbers. Design/methodology/approach Two-dimensional analysis of melting of PCM inserted A block via impinging turbulent slot jet is numerically studied. Governing equations for turbulent flow are solved by using the finite element method via analysis and system fluent R2020. Findings The obtained results showed that the best melting occurred when the Reynolds number increased and the HNF was used. However, the impacts of using alumina-water nanofluid were slight. At Re = 12,500, phase completion time was reduced by about 13.77% when HNF was used while this was only 3.93% with water + alumina nanofluid as compared to using only water at Re = 5,000. In future studies, HNF concentrations will change the type of nanoenhanced PCMs. In addition, the geometry and jet parameters of the PCM-filled cube can be changed. Originality/value Effects of impinging jet onto PCM filled block and control of melting via impinging hot jet of PCM. Thus, novelty of the work is to control of melting in a block by impinging hot jet and nanoparticles.

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“…Since the fluid impinges on the surface being cooled or heated, the flow is short and the boundary layer on the impinged surface is thin, and it is an extremely effective method of enhancing heat transfer. Jet impingement heat transfer is widely used in many engineering fields [5][6][7][8][9][10][11] . Compared with a rolling production line of the medium plate, the production line of the hot rolled strip has the characteristics of fast rolling speed, compact equipment layout, high degree of automation, and flexible cooling path control.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics of cooling nozzle for high strength after hot rolling

Liu,

Shi,

Bian

et al. 2023

J. Phys.: Conf. Ser.

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To further improve the cooling strength and uniformity of hot rolled strip steel after rolling and optimize the structure and process parameters of high-strength cooling equipment, this paper combined the basic structural characteristics and characteristic parameters of high-strength cooling nozzles of hot rolled strip steel, using finite element analysis software. The effect of various pressure and structural arguments on the internal flow characteristics of high-strength cooling nozzles was studied. The results show that with the increasing of the system pressure, the flow rate at the manifold outlet also increases gradually, and the fluctuation of the jet velocity increases gradually, but the flow line trend of the internal velocity is unchanged. The change in the position of the main shunt hole can affect the change in flow rate at the nozzle outlet. However, when the pressure is greater than 0.3 MPa, the fluctuation range of the flow rate at the slot outlet tends to be larger. The relevant results provide some reference for the design of high-strength cooling equipment in hot rolling.

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Numerical investigation of jet array impingement cooling with effusion holes

Cited by 25 publications

References 32 publications

Aerodynamic optimization method of intake grille of active clearance control system for turbines based on modified social spider algorithm (MSSA)

Aerodynamic optimization method of intake grille of active clearance control system for turbines based on modified social spider algorithm (MSSA)

Analysis of melting of phase change material inserted a block via impinging turbulent slot jet

Flow characteristics of cooling nozzle for high strength after hot rolling

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