Comparison of inviscid and viscous transonic flow field in VKI gas turbine blade cascade

Moshizi, S.A.; Madadi, Ali; Kermani, M.J.

doi:10.1016/j.aej.2014.03.007

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…In both cases the minimum and maximum portions of the losses are due to viscous and thermodynamic losses, respectively. For smooth blades contribution of viscous losses is low in comparison to other source of losses (Moshizi et al 2014).Also as observed in Fig. 12, portion of the viscous losses in subsonic outflow case (Pb = 60 kPa) is more than that in the supersonic outflow (Pb = 30 kPa).…”

Section: Effects Of Condensation On Different Specifications Of the Fmentioning

confidence: 53%

Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines

Esfe¹,

Kermani²,

Saffar‐Avval³

2016

JAFM

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In this paper, effects of non-equilibrium condensation on deviation angle and performance losses of wet stages of steam turbines are investigated. The AUSM-van Leer hybrid scheme is used to solve the two-phase turbulent transonic steam flow around a turbine rotor tip section. The dominant solver of the computational domain is the non-diffusive AUSM scheme (1993), while a smooth transition from AUSM in regions with large gradients (e.g. in and around condensation-and aerodynamic-shocks) to the diffusive scheme by van Leer (1979) guarantees a robust hybrid scheme throughout the domain. The steam is assumed to obey nonequilibrium thermodynamic model, in which abrupt formation of liquid droplets produces a condensation shock. To validate the results, the experimental data by Bakhtar et al. (1995) has been used. It is observed that as a result of condensation, the aerothermodymics of the flow field changes. For example for supersonic wet case with back pressure Pb=30 kPa, the deviation angle and total pressure loss coefficient change by 65% and 200%, respectively, with respect to that in dry case.

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Section: Effects Of Condensation On Different Specifications Of the Fmentioning

confidence: 53%

Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines

Esfe¹,

Kermani²,

Saffar‐Avval³

2016

JAFM

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“…Nevertheless, having a y  lower than 1 leads to more accurate results. In the present study, the maximum value for y  is equal to 3.5 which gives acceptable results while reducing the computational overhead (compared to the y  case) of the simulation [18,19]. First, the numerical accuracy of  SST model has to be reliable if y  of the adjacent node to the blade surface would be lower than 5.…”

Section: Grid Generation and Grid Independencymentioning

confidence: 95%

Dynamic Stall Analysis of S809 Pitching Airfoil in Unsteady Free Stream Velocity

2015

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In this paper, the dynamic stall of S809 airfoil that widely used in horizontal axis wind turbine, in different reduced frequencies is investigated. The simulation was carried out numerically handling NavierStokes equations. For this purpose, the segregated solver with SIMPLE algorithm was chosen to solve the momentum equations. The effect of turbulence on the flow field is taken into account using Shear Stress Transport (SST)  turbulence model. The obtained numerical results are compared with experimental and a few numerical results. The results indicate that the  SST model is in good agreement with experimental results for both steady and unsteady conditions. Furthermore, a nondimensional parameter, relating the acceleration of unsteady free stream velocity and acceleration of pitch motion (known as reduced frequency), is also investigated. In addition, the results show that any increase in the reduced frequency increases the instantaneous aerodynamic characteristics of oscillating airfoil.

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A novel optimization approach for axial turbine blade cascade via combination of a continuous-curvature parameterization method and genetic algorithm

et al. 2021

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Comparison of inviscid and viscous transonic flow field in VKI gas turbine blade cascade

Cited by 7 publications

References 19 publications

Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines

Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines

Dynamic Stall Analysis of S809 Pitching Airfoil in Unsteady Free Stream Velocity

A novel optimization approach for axial turbine blade cascade via combination of a continuous-curvature parameterization method and genetic algorithm

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