Aerospace Technic and Technology

The issues of substantiation of the most rational, based on adequacy, model of turbulent viscosity for mathematical modeling of the flow near the propfan and in the inlet of the turbine-propeller engine are considered. It was found that at present there is no universal turbulence model for determining the parameters of the boundary layer, energy loss in the flow, and laminar-turbulent transition. Analysis of the results of previous studies showed that there is a need to select and justify a turbulent viscosity model for each type of research object. The task of modeling the flow near the propfan and in the inlet device of the power plant was performed using the ANSYS CFX software product, which allows using various standard mathematical models and tools for modeling turbulent flow. The object of research is an annular axial inlet device, in front of which there is a coaxial propfan with two rows of propellers: the first row has eight blades, the second - six. 7 types of models of turbulent viscosity, which most fully describe the phenomena in the flow around the propfan and the inlet device, have been investigated: k-ωmodel; SSТ (shear stress transport) SST Transitional №1 Fully turbulence; SST Transitional №2 Specified Intermittency; SST Transitional №3 Gamma model; SST Transitional №4 Gamma theta model; SST Transitional №5 Intermittency. The results of mathematical modeling of the flow near the propfan and in the inlet device at the corresponding operating mode of the turbopropfan engine using the selected models of turbulent viscosity, the total pressure value in front of and behind the inlet device was obtained to determine the total pressure recovery coefficient in it and the value of the propfan thrust. The value of the recovery factor of the total pressure in the inlet device and the propfan thrust are compared with the flight test data of the prototype. An analysis of the comparison of the values of the total pressure recovery factor in the inlet device and the propfan thrust showed that the use of the SST Transitional №4 Gamma theta model allows obtaining the value of the total pressure recovery factor in the inlet device and the propfan thrust that is closest to the flight test results.

turbopropfan engine; propfan; inlet device; power plant; turbulent viscosity model

Yun, A. Development and Analysis of Advanced Explicit Algebraic Turbulence and Scalar Flux Models for Complex Engineering Configurations. Darmstadt, 2005. 112 р.

Yun, A. A. Teoriyai praktika modelirovaniya turbulentnykh techeniy [Theory and practice of modeling turbulent flows]. Moscow, Book house "LIBROKOM" Publ., 2009. 272 р.

Кudinov, P. I. Sravnitel'noe testirovanie modeley turbulentnosti Spalarta-Almarasa i Mentera na zadache o transzvukovom obtekanii odinochnogo profilya RAE2822 [Comparative testing of the turbulence models of Spalart-Almaras and Menter on the problem of transonic flow around a single airfoil RAE2822]. Dnipropetrovsk, Dnepropetrovsk nat. univ. Publ., 2004. 9 p.

Snegirev, A. Yu. Vysokoproizvoditel'nye vychisleniya v tekhnicheskoy fizike. Chislennoe modelirovanie turbulentnykh techeniy [High performance computing in technical physics. Numerical modeling of turbulent flows]. St. Petersburg, Politechn. unst. Publ., 2009. 143 p.

Basov, K. A. ANSYS: spravochnik pol'zovatelya [ANSYS: user manual]. Moscow, DMK Press Publ., 2014. 640 p.

Wilcox, D. C. Turbulence Modeling for CFD. La Canada, California, DCW Industries Inc. Publ., 1998. 477 p.

Menter, F. R. Two-equation eddy-viscosity turbulence models for engineering applications. AIAAJ, 1994, vol. 32. no. 8, pp. 1598–1605.

ANSYS CFX, Release 11.0. Ansys Inc. Available at: https://www.academia.edu/6123972/ANSYS_CFX_Solver_Theory_Guide_ANSYS_CFX_Release_11_0. (accessed 10.02.2021).

Samolet An-70 № 01-02. Ocenka harakteristik vhodnogo ustrojstva marshevoj dvigatel'noj ustanovki s modernizirovannym vintoventiljatorom SV-27 [An-70 aircraft No. 01-02. Evaluation of the characteristics of the entrance device of the sustainer propulsion system with the upgraded SV-27 propfan]. ANTK im. O.K. Antonova. Teh. otchet № 70.702.032.D1-12, 2012. 100 p.