DNS of secondary flows over oscillating low-pressure turbine using spectral/hp element method

Nakhchi, M.E.; Naung, Shine Win; Rahmati, Mohammad

doi:10.1016/j.ijheatfluidflow.2020.108684

Cited by 13 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The momentum thickness approximates the loss of boundary layer [31,32]. Figure 9 compares the boundary layer momentum thickness at different spans for α47.2 °, α52.2 °and α55.2 °.…”

Section: Resultsmentioning

confidence: 99%

Effects of Flow Coefficient on Turbine Aerodynamic Performance and Loss Characteristics

Yang

Luo

et al. 2022

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

The effects of flow coefficient on the gas flow and loss characteristics inside the high-pressure turbine is investigated using a numerical simulation. In this paper, the midspan of the first stator of the “Lisa” 1.5 stage high-pressure turbine is used as a prototype to obtain different flow coefficients by changing the stagger angle and the exit angle. The boundary conditions of all cases are consistent with the experimental data of “Lisa”. The results show that the flow coefficient is decreased from 0.478 to 0.374 as the stagger angle is varied from 44.2° to 56.2° and from 0.630 to 0.341 as the exit angle is varied from 63° to 75°. Large stagger angle or large exit angle both cause an increase in turbine aerodynamic losses. The similarity between the two is that both cause enhanced effect of transverse secondary flow in the passage. The difference is that with large stagger angle, the adverse pressure gradient affects a large area, resulting in large boundary layer losses; with large exit angle, the passage vortex is weakened but with a large influence area.

show abstract

“…The momentum thickness approximates the loss of boundary layer [31,32]. Figure 9 compares the boundary layer momentum thickness at different spans for α47.2 °, α52.2 °and α55.2 °.…”

Section: Resultsmentioning

confidence: 99%

Effects of Flow Coefficient on Turbine Aerodynamic Performance and Loss Characteristics

Yang

Luo

et al. 2022

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

show abstract

“…The mapping function is used to distort the local mesh   ,   in the mapped coordinate system. The specifics of the mesh deformation are available in [30].…”

Section: Governing Equationsmentioning

confidence: 99%

High-resolution direct numerical simulations of flow structure and aerodynamic performance of wind turbine airfoil at wide range of Reynolds numbers

Nakhchi

Naung

Rahmati

2021

Energy

View full text Add to dashboard Cite

“…It is also important to ensure that frequency domain methods can predict the flow structures accurately when highly unsteady flows are involved. High-resolution direct numerical simulations of the transitional flow structures around an aerofoil provides interesting and detailed vortex structures [38,39]. The capability of a frequency domain method on capturing these highly unsteady flow structures in a modern low-pressure turbine was also investigated by Shine et al [40] by means of direct numerical simulation, and it is found that it has the capability of predicting complex and highly unsteady flows.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity CFD simulations of two wind turbines in arrays using nonlinear frequency domain solution method

2021

Self Cite

View full text Add to dashboard Cite

DNS of secondary flows over oscillating low-pressure turbine using spectral/hp element method

Cited by 13 publications

References 48 publications

Effects of Flow Coefficient on Turbine Aerodynamic Performance and Loss Characteristics

Effects of Flow Coefficient on Turbine Aerodynamic Performance and Loss Characteristics

High-resolution direct numerical simulations of flow structure and aerodynamic performance of wind turbine airfoil at wide range of Reynolds numbers

High-fidelity CFD simulations of two wind turbines in arrays using nonlinear frequency domain solution method

Contact Info

Product

Resources

About