Assessment of Various Turbulence Models in a High Pressure Ratio Centrifugal Compressor With an Object Oriented CFD Code

Abstract

The flow field in a high pressure ratio centrifugal compressor with a vaneless diffuser has been investigated numerically. The main goal is to assess the influence of various turbulence models suitable for internal flows with an adverse pressure gradient. The numerical analysis is performed with a 3D RANS in-house modified solver based on an object-oriented open-source library. According to previous studies from varying authors, the turbulence model is believed to be the key parameter for the discrepancy between experimental and numerical results, especially at high pressure ratios and high mass-flow. Particular care has been taken at the wall, where a detailed integration of the boundary layer has been applied. The results present different comparisons between the models and experimental data, showing the influence of using advanced turbulence models. This is done in order to capture the boundary layer behavior, especially in large adverse pressure gradient single stage machinery.

Aerodynamic Optimization Design of a 150 kW High Performance Supercritical Carbon Dioxide Centrifugal Compressor without a High Speed Requirement

“…The Shear Stress Transport (extended wall function) turbulence model was selected. Some other scholars [19][20][21] have also used the turbulence model in the analysis of centrifugal compressor, and obtained reasonable results. For the impeller inlet, the total temperature was 309.15 K and the total pressure was 7.8 MPa.…”

Some features of implementation of design model of high-pressure centrifugal compressor stage with inlet guide vanes

“…Для математического моделирования движения вязкой сжимаемой жидкости использовался метод RANS (Reynolds-Averanged Navier Stokes). Для моделирования турбулентного режима применяется модель Ментера Shear Stress Transport (SST) [13], т. к. в предыдущих исследованиях данная модель показала удовлетворительные результаты для числа Маха ≥ 1,4 [1][2]9].…”

“…При работе осерадиальных рабочих колес на высоких частотах вращения в проточной части появляются транс-и сверхзвуковые режимы, которые и определяют выбор параметров расчетной модели в проточной части. В ряде публикаций [1][2][3][4][5][6][7][8][9] даны рекомендации и оценка влияния различных параметров расчета, приведена верификация полученных результатов. После правильной постановки математической задачи можно оценить влияние конструктивных изменений в проточной части [10][11][12].…”

Feasibility of mini combined cycles for naval applications

“…The CFD calculation is arranged throughout Numeca/FineTurbo and is carried out by means of Numeca/Euranus Navier Stokes equations solver. A RANS steady approach [25] has been used and the two equations SST (Shear Stress Transport) model [26][27] has been chosen for representing turbulence phenomenology. No slip boundary condition is assumed at solid walls and rotation periodicity condition is adopted to match periodic surfaces.…”