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The article presents the analysis of a commonly used performance modification method for turboprop and turboshaftengines with a free power turbine. The description of analytical and numerical methods of evaluation for a change ofparameters and geometry of turbine assemblies are presented. There are also given the basic methods of changing throatarea of turbine nozzle guide vanes and its influence on engine performance. The calculation methods are verified byexperimental tests run by WSK “PZL-Rzeszów” S.A.

Determination of performance and parameters for turboprop and turboshaft engine for modification through change of gas temperature before turbine