Abstract
Modelling the characteristics of axial compressor of variable flow passage geometry, working in the gas turbine engine system This paper concerns application of mathematical modelling methods to analyzing gas-dynamic processes in marine gas turbines. Influence of geometry changes in axial compressor flow passage on kinematical air flow characteristics, are presented. The elaborated mathematical model will make it possible to realize - in the future - simulative investigations of gas-dynamic processes taking place in a compressor fitted with controllable guide vanes.
Highlights
An important problem of operation of ship gas turbine engines1 is to know influence of changeable technical state of engine on its working parameters
The more-or-less-contaminated atmospheric air flowing into the compressor causes a.o. continuously changing form of blade passages, increased roughness of blade surfaces as well as change of mass of compressor rotor
If the compressor design contains a control system for setting controllable blades of guide vanes to make cooperation of all engine’s units optimal by continuous correcting the compressor characteristics the disturbances occurring in work of the system will result in changes in operation of the compressor and engine, of a character similar to those due to rotational speed changes or contaminated blade passages of compressor
Summary
An important problem of operation of ship gas turbine engines is to know influence of changeable technical state of engine on its working parameters. The more-or-less-contaminated atmospheric air flowing into the compressor causes a.o. continuously changing form of blade passages, increased roughness of blade surfaces as well as change of mass of compressor rotor It seriously impacts compressor’s operation stability, changes its characteristics as well as performance and efficiency of the entire engine. Dynamic development of computer technique applied already to the design stage of engine’s units has made it possible to use it for numerical simulation of changeable technical state processes. Such approach greatly shortens the time necessary for diagnostic tests aimed at determining a set of „defectsymptom” relations, as compared with the time-consuming and expensive investigations carried out on real objects. The computer software based on mathematical models makes it possible to realize numerical experiments consisting in putting-in real variables and hypothetical technical states of engine
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