Математичні моделі для розрахунків та проектування проточних частин енергетичних установок
The paper describes an algorithm for the designing of axial and radial-axial type turbines. The algorithm is based on using of mathematical models of various levels of difficulty – from 1D to 3D.3D viscous flows modeling performed on the basis of numerical integration of the Reynolds averaged non-st...
Збережено в:
| Дата: | 2014 |
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| Автор: | |
| Формат: | Стаття |
| Мова: | Ukrainian |
| Опубліковано: |
General Energy Institute of the National Academy of Sciences of Ukraine
2014
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| Теми: | |
| Онлайн доступ: | https://systemre.org/index.php/journal/article/view/536 |
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| Назва журналу: | System Research in Energy |
Репозитарії
System Research in Energy| Резюме: | The paper describes an algorithm for the designing of axial and radial-axial type turbines. The algorithm is based on using of mathematical models of various levels of difficulty – from 1D to 3D.3D viscous flows modeling performed on the basis of numerical integration of the Reynolds averaged non-stationary Navier-Stokes equations. To accounting of the turbulent effects is used SST Menter two-parameter differential turbulence model. The initial equations are integrated using a high accuracy implicit quasimonotone ENO-scheme. To account for the thermodynamic properties of the working fluid used the equations of state of a perfect gas, Tamman and Van der Waals. Real thermodynamic properties of working fluids including water and steam are described using an interpolation-analytical method of approximation of modified Benedict-Webb-Rubin equations with 32 members and equations of IAPWS-95 formulation. Model of three-dimensional turbulent flow is realized in the software package IPMFlow, which is the development of software packages FlowER and FlowER-U.Description of the axial and radial-axial type flow parts geometry is performed using the parameterization and analytical profiling, initial data for which is a limited number of parameterized values. As parameterized are chosen those values which or accepted in turbine construction, or those which have a simple geometric interpretation. Methods are different for the blades of the radial-axial and axial types.Introduced the examples of developed or modernized with the help of the algorithm turbines flow parts of power machines for different purposes – turbo expander, the turbine which work at low-boiling working fluid, medium pressure cogeneration turbine. |
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