Large Eddy Simulation of a Condensing Wet Steam Turbine Cascade

2021 ◽  
Author(s):  
Pascal Post ◽  
Benjamin Winhart ◽  
Francesca Di Mare
Keyword(s):  
Large Eddy Simulation ◽  
Steam Turbine ◽  
Turbine Cascade ◽  
Wet Steam ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation of dense gas flow around a turbine cascade

2019 ◽  
Author(s):  
Jean-Christophe Hoarau ◽  
Paola Cinnella ◽  
Xavier Gloerfelt
Keyword(s):  
Large Eddy Simulation ◽  
Gas Flow ◽  
Dense Gas ◽  
Turbine Cascade ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation of a Low Pressure Turbine Cascade

2003 ◽  
Author(s):  
Yoshinori Ooba ◽  
Hidekazu Kodama ◽  
Chuichi Arakawa ◽  
Yuichi Matsuo ◽  
Hitoshi Fujiwara ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Low Pressure ◽  
Turbine Cascade ◽  
Low Pressure Turbine ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation of a Condensing Wet Steam Turbine Cascade

2020 ◽  
Author(s):  
Pascal Post ◽  
Benjamin Winhart ◽  
Francesca di Mare
Keyword(s):  
Steam Turbine ◽  
Isotropic Turbulence ◽  
Turbulence Modeling ◽  
Wave Structure ◽  
Condensation Process ◽  
Test Case ◽  
Numerical Treatment ◽  
Turbine Cascade ◽  
Wet Steam ◽  
Eddy Simulation

Abstract The influence of turbulence modeling approach by means of (U)RANS and LES on the overall modeling of turbulent condensing wet steam flows is investigated using the example of a low-pressure steam turbine cascade. For an accurate numerical treatment of turbulence in presence of shock waves, necessary for predictive scale-resolving computations, a hybrid flux treatment switches between a baseline non-dissipative central flux in energy consistent split form and a shock-capturing upwind flux in shocked regions based on a shock sensor. Condensation is realized by a mono-dispersed Euler-Euler source term model, the equation of state by the highly efficient and accurate SBTL tabulation. The numerical treatment is validated with a decay of homogeneous isotropic turbulence test case containing eddy shocklets. The measurement results of the condensing wet steam cascade are overall much better matched by LES compared to RANS and URANS. Analysis shows that the LES is much better able to account for the inherently unsteady nature of the spontaneous condensation process and its interaction with the trailing edge shock wave structure.

Large eddy simulation of a linear turbine cascade with a trailing edge cutback

Energy ◽  
2021 ◽  
Vol 220 ◽  
pp. 119694
Author(s):  
Shota Moriguchi ◽  
Hironori Miyazawa ◽  
Takashi Furusawa ◽  
Satoru Yamamoto
Keyword(s):  
Large Eddy Simulation ◽  
Turbine Cascade ◽  
Trailing Edge ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Large Eddy Simulation and RANS Analysis of the End-Wall Flow in a Linear Low-Pressure-Turbine Cascade—Part II: Loss Generation

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Michele Marconcini ◽  
Roberto Pacciani ◽  
Andrea Arnone ◽  
Vittorio Michelassi ◽  
Richard Pichler ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Flow Characteristics ◽  
Turbulence Models ◽  
Low Pressure ◽  
Companion Paper ◽  
Turbine Cascade ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Wall Flow ◽  
End Wall

In low-pressure turbines (LPT) at design point, around 60–70% of losses are generated in the blade boundary layers far from end walls, while the remaining 30–40% is controlled by the interaction of the blade profile with the end-wall boundary layer. Increasing attention is devoted to these flow regions in industrial design processes. This paper discusses the end-wall flow characteristics of the T106 profile with parallel end walls at realistic LPT conditions, as described in the experimental setup of Duden, A., and Fottner, L., 1997, “Influence of Taper, Reynolds Number and Mach Number on the Secondary Flow Field of a Highly Loaded Turbine Cascade,” Proc. Inst. Mech. Eng., Part A, 211(4), pp.309–320. Calculations are carried out by both Reynolds-averaged Navier–Stokes (RANS), due to its continuing role as the design verification workhorse, and highly resolved large eddy simulation (LES). Part II of this paper focuses on the loss generation associated with the secondary end-wall vortices. Entropy generation and the consequent stagnation pressure losses are analyzed following the aerodynamic investigation carried out in the companion paper (GT2018-76233). The ability of classical turbulence models generally used in RANS to discern the loss contributions of the different vortical structures is discussed in detail and the attainable degree of accuracy is scrutinized with the help of LES and the available test data. The purpose is to identify the flow features that require further modeling efforts in order to improve RANS/unsteady RANS (URANS) approaches and make them able to support the design of the next generation of LPTs.

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