VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University249410.18287/1998-6629-2014-0-5-1(47)-163-172UnknownValidation of CFD-models of gas turbine engine uncooled turbinesMatveevV. N.<p>Doctor of Science (Engineering), Professor</p>
<p>Head of the Department of Aircraft Engines Theory</p>mvn@ssau.ruPopovG. M.<p>Postgraduate student of the Department of Aircraft Engines Theory</p>grishatty@gmail.comGoryachkinE. S.<p>Postgraduate student of the Department of Aircraft Engines Theory</p>evgeni0063@yandex.ruSmirnovaYu. D.<p>Engineer of the Department of Aircraft Engines Theory</p>Y.D.Smirnova@yandex.ruSamara State Aerospace University20122014135-11631721806201518062015Copyright © 2015, VESTNIK of the Samara State Aerospace University2015<p>In the course of the work presented in the paper the agreement between the parameters obtained bymethods of computational fluid dynamics and the values used in the JSC "Kuznetsov" in the mathematical modelof a gas-turbine unit NK-36ST was verified. A lowpressure turbine and a free turbine of a stationary gas turbineplant were the object of research. During the research three computational models of turbines with differentnumbers of finite-element computational grids were devised that do not take into account the presence of theturbine cavities. The models of the first level contained approximately 450,000 items in one blade row, the modelsof the second level - approximately one million elements in one blade row, while those of the third level -about 2 000 000 items per one blade row. A model that includes turbine cavities was also constructed. Diagramsof pressure profiles, total temperature, flow angle and turbulent viscosity throughout the height of the flow section<br />derived from the preliminary CFD calculations were set as boundary conditions at the inlet of the turbines.The calculation was performed in the Numeca Fine/Turbo software package and resulted in obtaining the basicparameters of the flow in turbines. The dependences of the flow capacity of the turbine А, turbine efficiency,turbine pressure ratio, the outlet flow angle in absolute frame on the parameter n/C*эфwere found ontheir basis.The influence of the calculated mesh dimensions on the results of turbine characteristics simulation wasinvestigated. The effect of taking into account the turbine cavities on the design characteristics of the turbine inthe process of simulation was also investigated. Recommendations for constructing computational models ofuncooled axial turbines of gas turbine engines are developed, the possibility of optimization and preliminarycalculations using models that do not take into account the turbine cavities is justified.</p>Low-pressure turbineperformanceboundary conditionsfinite element meshcomputational modelstationary gas turbine plantТурбина низкого давленияхарактеристикаграничные условиясетка конечных элементоврасчётная модельстационарная газотурбинная установка[1. Kulagin V.V. Teoriya, raschet I proektirovanie aviatsionnykh dvigateley I energeticheskikh ustanovok [Theory, analysis and design of aircraft engines and power plants: textbook for higher schools]. Мoscow: Mashinostroyeniye Publ., 2003. 616 p.]