Features of Computer Modeling of the Working Process of Small-scale Gas Turbine Engines

The article describes the thermogasdynamic model of small-scale gas turbine engine. This model takes the engine size into account during the efficiency assessment. The engine size is defined by the value of mass flow rate corrected by parameters at the exit of the compressor. The important features of working process of small-scale gas turbine engines are the increased hydraulic losses and decreased turbomachinery efficiency due to the increasing of a boundary layer relative thickness and relative tip clearances. This article describes the mathematical models that provide the corrected values of turbomachinery and combustion chamber efficiency ratios. This approach provides more adequate results of working process parameters optimization and may be used for conceptual designing of micro gas turbine engines.