Numerical Study of Effect of Streamwise End Wall Fences on Secondary Flow Losses in Two Dimensional Turbine Rotor Cascade

Kumar, Krishna N.; Govardhan, M.

doi:10.1080/19942060.2010.11015343

Cited by 5 publications

(3 citation statements)

References 19 publications

(13 reference statements)

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“…In this situation, the CFD method shows its advantages. In recent years, CFD mothed has been more and more widely used in industrial research field because of the effective and economic characteristics (Akbarian et al, 2018;Ardabili et al, 2018;Mou, He, Zhao, & Chau, 2017;Ramezanizadeh, Nazari, Ahmadi, & Chau, 2019), especially in the research direction of aeroengine (Broatch et al, 2014;Fan et al, 2015;Kumar & Govardhan, 2010;Mutlu & Cakan, 2018). Chew and Hills (2007) summarized the applications of CFD in the rotating cavity before 2007, these applications showed that, CFD contributing a lot to the understanding of complex flow characteristic in the rotating cavity.…”

Section: Introductionmentioning

confidence: 99%

A mathematical model for predicting the pressure drop in a rotating cavity with a tubed vortex reducer

Song

Yan

Mao

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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The flow characteristics of a tubed vortex reducer, which was used to reduce the pressure drop in an aeroengine air bleed system, were studied in this paper. Accurate prediction of the pressure drop in a rotating cavity with tubed vortex reducer installed is important, but the complex flow structure results in complicated local loss characteristic at the tube entrance, which is difficult to estimate. In this paper, a mathematical model for predicting the pressure drop in a rotating cavity with a tubed vortex reducer was established. For the first time, the effect of the local loss at the tube entrance under rotating conditions was considered, and a method of introducing the local loss factor was established based on a research method applied in traditional rotating orifices. Furthermore, the flow characteristics and the distribution of the static pressure in the tubed vortex reducer cavity were studied by the CFD method and experimental tests, and the pressure information inside the tubed vortex reducer was obtained by detailed experimental testing. This study reveals that the local loss characteristics at the tube entrance are mainly influenced by the incident angle; the closer the incident angle is to 0, the greater the speed coefficient is. The pressure drop at the tube entrance is important and represents approximately 10% of the total pressure drop. The mathematical model shows good accuracy for calculating the pressure drop, with an average error of approximately 2% compared to the experimental data.

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Section: Introductionmentioning

confidence: 99%

A mathematical model for predicting the pressure drop in a rotating cavity with a tubed vortex reducer

Song

Yan

Mao

et al. 2019

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…Kumar et al 12,13 , Chen et al 14 , Zhong et al 15 , and Hergt et al 16 investigated and compared the flow loss and secondary flow reduction of endwall fence with different geometrical parameters. Their work demonstrated that the optimum endwall fence design had the height of 1/3 of inlet boundary layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the endwall fences with varying geometrical parameters on secondary flow control

Bian

Shen

Feng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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This study investigates the effect of the fences with varying height and chord length on the secondary flow reduction. Three-dimensional flow structure on the endwall and streamline on the blade surface are analyzed to determine the effect of fence geometry on the secondary flow reduction. The results demonstrate that the pressure leg of the horseshoe vortex induced by the fences can prevent the passage vortex of the main blade. In this work, a fence geometry is found to reduce the secondary flow loss and decrease the total pressure loss coefficient of the main blade by about 4%. However, the fences with large chord length are found to bring a greater additional flow loss, which is induced by the flow separation of the fences. Thus, the fences could be applied only when the fences induced additional loss is lower than the loss due to the secondary flow that they prevent.

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“…Kumar and Govardhan 16,17 investigated the effect of the fence height on the secondary flow reduction. His result indicated that 1/3 of inlet boundary layer thickness was found to be optimum fence height, which is consistent with Kawai's results.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the influence of splitter geometry on secondary flow control

Bian

Shen

Feng

2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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In turbmachinery, splitters are used to control secondary flow and to improve the aerodynamic performance of outlet guide vane (OGV) of axial fan. However, there is few information in the open literature focusing on the effect of the splitter geometry on the secondary flow control. In this work, the numerical investigations were performed for NACA 65-010 profile with different splitters. The spacing ratio of the main blade was 1, the spacing between the splitters and the main blade was 30mm. Three different splitters were compared to investigate the effect of the splitter geometry on secondary flow control. The flow structures near the end-wall, the streamlines on the suction surface of blade and the distribution of the flow losses on the trailing edge of blade was shown and discussed. The results showed the splitters can control the secondary flow and reduce the area of the high flow losses at the junction of end-wall and blade. However, the flow separation of the splitters also causes flow losses in the wake behind the splitters. Therefore, only the specific configuration of splitters can reduce the flow losses of the blade.

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Numerical Study of Effect of Streamwise End Wall Fences on Secondary Flow Losses in Two Dimensional Turbine Rotor Cascade

Cited by 5 publications

References 19 publications

A mathematical model for predicting the pressure drop in a rotating cavity with a tubed vortex reducer

A mathematical model for predicting the pressure drop in a rotating cavity with a tubed vortex reducer

Numerical investigation on the endwall fences with varying geometrical parameters on secondary flow control

Numerical study of the influence of splitter geometry on secondary flow control

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