The paper reviews the present computer-aided systems (CAE-systems) of conceptual designing and engineering analysis of the gas turbine engines (GTE) and power-plants (GTPP). Each of the examined system is briefly described and the comparative analysis of the following systems: ASTRA, DVIGwT, EngineSim, GasTurb, GSP and Uni_TTF is described. Trends of the development of CAE-systems of gas turbine engines are also indicated.

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The article describes the results of investigation of the theoretical limits of the conventional gas turbine engines on the basis of numerical simulation using the computer-aided system "astra". The results of simulation are used to forecast the gas turbine engines' parameters as well as to determine whether the potentialities of the conventional gas turbine engines are exhausted or not. The approaches to increasing the efficiency of propulsion unit and the thermogasdynamic cycle are suggested.

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Several new correlation-regression models of weight calculation for small-scale aircraft gas turbine engines are proposed for their conceptual design stage. A comparison of the obtained weight models with each other and with the Kuz’michev model is carried out. Based on the obtained results, conclusions about the feasibility and scope of their application are drawn. New correlation-regression models differ from each other in the number of input parameters, as well as in the accuracy of forecasting the weight. In the course of the work, a database of main data and thermodynamic parameters of turbofan engines (TFE) is created consisting of 92 small-scale TFEs with thrust less than 50 kN. Based on the collected statistics, formulas were obtained that allow calculating the weight at the initial stage of engine design. The error in calculating the weight by these models is in range from 10% to 30%.