This paper presents the results of an aerodynamic analysis of a small-scaled transonic centrifugal compressor for micro turbojet engine (TJE) applications. The analysis was conducted using a CFD model validated by experimental data collected for the gaged JetCat P200-RX micro-TJE. The loss coefficients of the impeller, vaned diffuser and deswirler were estimated for 4 design points corresponding to 70%, 80%, 90% and 100% rotation speeds to perform the loss balance diagram. The flow angle spanwise variation demonstrated an intensive flow separation zone at the top 25% of the vaned diffuser span due to the pressure shock appearance. It was shown that the main source of the losses in the investigated compressor is the deswirler due to non-optimal flow turning conditions. The diffuser loss coefficient was estimated as 0.18 at the compressor full load.

This article discusses the problems of gas dynamic processes modeling in the design of burner devices of low-emission combustion chambers of gas turbine engines. Characteristic features of existing physical and mathematical combustion models, turbulence and radiant heat exchange are analyzed. The necessity of developing a technique that allows developing a final model based on existing physical and mathematical models of turbulence, combustion, radiant heat exchange, and chemical kinetics mechanisms, that accurately reflects gas dynamic processes in burner device of low-emission combustion chamber and allows performing practical calculations with a given accuracy, is identified and justified.To achieve this goal, the authors suggest the following:- to conduct filed tests of the burner device under study;- to perform three-dimensional gas dynamic calculations of the burner device under study using the most used models of turbulence, combustion and radiation;- based on the results of calculations and field tests, to perform validation and select the most appropriate models for the formation of the final physical and mathematical model of the burner device under study;- using the final physical and mathematical model to solve a practical problem in order to test the developed simulation procedure.