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Приведены результаты расчетного анализа по обратному влиянию силовых стоек, размещенных в выходном диффузоре, на течение в отсеке "последняя ступень турбины - выходной диффузор". Показано, что на режиме с умеренной закруткой потока при входе в диффузор силовые стойки практически не влияют на трехмерную структуру потока за ступенью. Достоверность оценки подтверждена сравнением расчетных и экспериментальных данных.
The paper presents the results of numerical analysis of the inverse effect that support struts, placed in the an exhaust diffuser, have on flow in of the "last turbine stage - exhaust diffuser" section. It has been shown that in the regime with moderate flow swirl at the diffuser inlet power struts have virtually no effects on the three-dimensional flow structure behind the stage. The reliability of this assessment is confirmed by a comparison between the computational and the experimental data. Therefore, if the input stream has a moderate swirl, it is possible to perform a 3D simulation of the flow in a diffuser with struts, by using the domain isolated from the last turbine stage and by setting the boundary conditions at the entrance to the diffuser according to the flow calculation in the last stage of the turbine without the diffuser.
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