Ishchuk V. Turbopropfan engines thrust performances development of at airplane landing.

The object of research is processes of aircraft turbo-prop-fan engine (TPFE) thrust variation; the objective of the research is improvement of landing performances of aircrafts with TPFE by direct forming of thrust performance. Research methods: mathematic and natural modeling, theory of dynamic systems, theory of similarity, methods of experimental research on semi-natural test-cells, on real engine and aircraft. Obtained scientific results allow: to form technical requirements to engine thrust performances on preliminary stage of design taking into account required aircraft landing performance; to organize rational interaction of aircraft and powerplant systems taking part in control of landing; to make synthesis of powerplant dynamic properties and on this base - determine programs of control on reverse mode; to modify thrust control program using correction on longitudinal overload to improve quality of control. Scientific novelty: there is proposed the complex method of TPFE thrust performances forming at landing which is based on using of: criteria relations between thrust at aircraft motion parameters at landing run; mathematic model of two-row propfan in graph-analytical view; structure of formation decision about reverse switching-on; method of synthesis of TPFE control program on reverse operational mode and its adaptive correction taking into account longitudinal overload. Implied: method of TPFE thrust performance forming at landing of An-70 aircraft. Efficiency: industrial. Application: aviation propulsion engineering.