Validation of a 3D RANS Solver With a State Equation of Thermally Perfect and Calorically Imperfect Gas on a Multi-Stage Low-Pressure Steam Turbine Flow

Abstract

A state equation of thermally perfect and calorically imperfect gas is implemented in a 3D RANS solver for turbomachinery flow applications. The specific heats are assumed as linear functions of temperature. The model is validated on a five-stage low-pressure steam turbine. The computational results exhibit the process of expansion in the turbine. The computed and measured distributions of flow parameters in axial gaps downstream of subsequent turbine stages are found to agree reasonably well. It is also shown that the obtained numerical solution gives considerable improvement over the solution based on the thermally and calorically perfect gas model.

Modelling 3D Steam Turbine Flow Using Thermodynamic Properties of Steam Iapws-95

“…The initial data for modeling regenerative extractions and labyrinth seal flows were determined earlier in [14] using a one-dimensional approach. They are included in Table 1 …”

Development of the 500 kW and 1 MW ORC turbine flow parts

“…Flow computations are made with the help of a code IPMFlow [5,6], which draws on the following mathematical models: Reynolds (Favre) averaging of Navier-Stokes equations, SST turbulence model of Menter, implicit quasi-monotonous high-order ENO scheme. The results of computations obtained from the code IPMFlow provide flow details and global characteristics of turbine blading systems [7,8].…”

Two vortex interaction patterns in a turbine rotor

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“…The rotor wake (8), this time located on the left-hand side of the each figure, is accompanied by a number of additional vortices in its lower part, a possible effect of the rotor passage vortex breakdown. The lower part of the passage vortex (5), which in plane z/c = 0.9 was a single structure, now has a form of a vortex pair, t/T = 3/8 ÷ 4/8.…”