Abstract
The contribution deals with the numerical simulation of air and steam flow through the model of control valve for steam turbines. Numerical simulations were compared with experimental measurements for the award of the same boundary conditions. Valve characteristics have been computed for individual travel heights and pressure ratios of two variants of seat inflow angle (90° and 60°). Some other aspects are discussed in the article - comparison of the axysymmetric and 3D modelling, influence of the computational domain size, comparison of characteristics for two flow media, experimental model of the valve etc. The mentioned results are important for engineering simulations and also for design of the control valves for steam turbines of the large output.
Highlights
The control valve in a steam turbine is a main component included in the turbine set
COMPARISON OF NUMERICAL SIMULATIONS WITH EXPERIMENTAL MEASUREMENTS. This comparison was performed in order to evaluate the accuracy of the numerical simulation results because, as it was discovered, reliable comparison of flow characteristics obtained by measurements and simulations is not available despite the existing large amount of numerical simulations and experimental measurements [2, 3]
The study suggests that to a certain extent, they need not affect the flow characteristics, but can affect force impacts on the valve. x The results of the simulations and produced curves proved that a change of geometry in the flow part of the valve to a newly suggested 60° version can increase the flow through the valve while keeping the same flow area
Summary
The control valve in a steam turbine is a main component included in the turbine set. The system includes valve control (i.e. servos or HP hydraulic system) which sets the valves and screens to the required flow rate and pressure of the steam. It contains an electronic system with control software which enables setting the valves, i.e. changing the steam flow into the turbine and changing the turbo-set output, from the control centre. The control valve should reliably regulate the amount of steam flow and the turbine set output. These valves are produced in many versions with various arrangements and plugs. The target of this work is accuracy verification of a CFD simulation of the flow characteristics, to explain away some questions from work [3] and evaluating an effect of the inflow angle of the valve seat (and some other parameters) on the flow characteristics to compare the results with the older [4] and new experimetal results
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