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Characterization of Secondary Air Circuits in a Gas Turbine Engine

Characterization of Secondary Air Circuits in a Gas Turbine Engine. In Collaboration with. 29/03/2019. Valerio Lanata. Characterization of Secondary Air Circuits in a Gas Turbine. Secondary Air System.

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Characterization of Secondary Air Circuits in a Gas Turbine Engine

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  1. Characterization of Secondary Air Circuits in a Gas Turbine Engine In Collaboration with 29/03/2019 Valerio Lanata

  2. Characterization of Secondary Air Circuits in a Gas Turbine Secondary Air System • Under the name of SecondaryAir System goes all those flows that do not actively take part in producing useful work • These air flow rates are used to perform different tasks such as the cooling of turbine and combustion chamber elements, sealing, clearance controls. EC3 EC1 EC2 EC3 EC4 EC2 EC1 IC3 IC2 IC1 Valerio Lanata - DIME

  3. Characterization of Secondary Air Circuits in a Gas Turbine SimilarityTheory • permits to reduce the number of parametersthat control the problem • characterize the dependence of the system on particularcombinations of the originaldimensionalparameters Given two circuits geometrically similar, the similarity theory: For the same value of the reduced parameters, similarity rules and the solution of a geometrically similar problem can be rescaled from a known solution Valerio Lanata - DIME

  4. Characterization of Secondary Air Circuits in a Gas Turbine The Characteristic Curve • Applying the similaritytheoryitispossible to derive an analytical relation between the dimensionlessparametersinvolved in the problemsolution • Thisfunction, thatallows to correlate the performances of the machine, also in operatingconditionsdifferent from the nominal one, iscalledcharacteristic curve Valerio Lanata - DIME

  5. Characterization of Secondary Air Circuits in a Gas Turbine Characteristics’ Method Application • The SAS characteristiccurveshave to be matched with the compressor and turbine curves because these components govern the boundaryconditions of the SAS circuits • To generate the characteristiccurves a 0D fluid network hasbeenused to obtain the values of mass flow rate, pressure and temperature along the SAS circuit, for a fixed set of boundaryconditions Valerio Lanata - DIME

  6. Characterization of Secondary Air Circuits in a Gas Turbine Characteristics’ Method Application • The values of mass flow rate, pressure and temperature for 6 different sets of boundaryconditionshavebeenused to generate the dimensionlessvalues of mass flow rate and pressure ratio: Valerio Lanata - DIME

  7. Characterization of Secondary Air Circuits in a Gas Turbine Characteristics’ Method Application • The reference pressures and temperatures for the scaling have been selected to obtain values of reduced mass flow rate and pressure ratio univocally defined from the compressor and turbine working points Valerio Lanata - DIME

  8. Characterization of Secondary Air Circuits in a Gas Turbine Internal Air Circuit COMPRESSOR TURBINE Valerio Lanata - DIME

  9. Characterization of Secondary Air Circuits in a Gas Turbine Boundaryconditions setup • Every pressure boundaryconditionhasbeenreferred to two pressure values, according to their positions: the total pressure valueat the compressor exit and the total pressure valueat the turbine inlet • Theseratios are obtained from a realistic pressure distribution inside the engine in the base testing point (TP1) and are keptconstant in everyother test conditions Valerio Lanata - DIME

  10. Characterization of Secondary Air Circuits in a Gas Turbine Characteristiccurves nomenclature IC2_TB2_COOL_PRE_MID Valerio Lanata - DIME

  11. Characterization of Secondary Air Circuits in a Gas Turbine Characteristiccurves of Cooling flow Valerio Lanata - DIME

  12. Characterization of Secondary Air Circuits in a Gas Turbine Characteristiccurves of Cooling flow Valerio Lanata - DIME

  13. Characterization of Secondary Air Circuits in a Gas Turbine Characteristiccurves of Leakage flow Valerio Lanata - DIME

  14. Characterization of Secondary Air Circuits in a Gas Turbine Superposition of TP1 and TP2 Valerio Lanata - DIME

  15. Characterization of Secondary Air Circuits in a Gas Turbine Conclusions The SAS circuitshavebeenmodelled in a 0D fluid network via some simplifications Manysimulationshavebeencarried on this net, with differentboundaryconditions, to obtain the values of mass flow rate, pressure and temperature along the circuit By the similaritytheory the behaviour of the circuit in everyreasonableworkingconditionshasbeenevaluated from the startingsimulationruns The system designedis fast, light and integrated in the Gas Turbine engine model Valerio Lanata - DIME

  16. Characterization of Secondary Air Circuits in a Gas Turbine Thankyou for yourattention Valerio Lanata - DIME

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