The choice of model for the assessment of profile losses in the blade rows by means of mathematical statistics methods

Results of research the five models, used for assessment of profile losses in axial turbines cascade: Sodelberg, Anley and Matheson, Dankhem and Keym, Kaker and Okapa and TsIAM (Russia) are given in article. Results of calculation were compared with the experimental data for 170 airfoil cascades of the axial turbines, reflecting all variety of blade profiles of axial turbines used in the aviation gas-turbine engines. Direct comparison of calculation results and an experiment did not allow to choose the best model unambiguously. Therefore the method of the analysis of losses models based on statistical analysis of rejection data of calculation and an experiment was developed. It is shown that the received deviations submit to the normal distribution law. On the basis of the analysis of expectations, and mean squared deviations of it was established that the results which are brought most closer to data of an experiment from the considered by CIAM model are shown. With probability of 95% it shows a deviation from the real values of losses 2x82%.