Control system simulation

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Presentation transcript:

Control system simulation GasTurb 13 Control system simulation Copyright © GasTurb GmbH

For this tutorial we will use a Turbojet. GasTurb 13 Main Window For this tutorial we will use a Turbojet. Copyright © GasTurb GmbH

Select the engine model We Need Some Data Select the engine model Open the engine model Copyright © GasTurb GmbH

Off-Design Input Window Select “Max Limiters” Copyright © GasTurb GmbH The control system protects the engine by limiting temperatures, pressures, spool speeds etc.

Max Limits Copyright © GasTurb GmbH Run the Off-Design cycle Enter numbers here Activate the selected limiters Click the Max Limiter option Copyright © GasTurb GmbH You can set switch on several limiters simultaneously. The limiter which restricts the engine most will fix the operating point.

Solution for Three Active Limiters Nrel,max=101% Close the result window T3,max=650K Active Limiter Copyright © GasTurb GmbH The Turbine Exit Temperature T5 limiter is active, neither the Spool Speed NH limit nor the Compressor Exit Temperature T3 limit is violated

Fuel Flow and Thrust as Pseudo Limiters Run the Off-Design cycle Enter the desired thrust Activate the limiter here Click the Max Limiter option Copyright © GasTurb GmbH You may want to run the engine to a given thrust.

Close the result window The Cycle for 25kN Thrust Thrust = 25kN Close the result window Copyright © GasTurb GmbH

HPC Spool Speed ZXN with Activated Limiters Click on “Basic Data” If any limiter is active, then the input for ZXN given (1) or ZT4 given (2) is automatically set to 1 and disabled. The HP Spool Speed ZXN is no longer seen on this page Copyright © GasTurb GmbH

HPC Spool Speed ZXN with Activated Limiters While a limiter is active, HP Spool Speed ZXN is an iteration variable Click on “Iteration Variables” Copyright © GasTurb GmbH

Limiters And Composed Values Click on “Formulas”” Copyright © GasTurb GmbH If you want to consider a limiter which is not on the Limiters page, then define a composed value.

Limiters And Composed Values Close the formula window and go to the limiter page Introduce as a P5Limiter the ratio of P5/P2, for example. Copyright © GasTurb GmbH Any Composed Value can be employed as Limiter.

Limiters And Composed Values Run the Off-Design cycle Select the composed value Enter an example value and activate it Copyright © GasTurb GmbH

Limiters And Composed Values Close the result window The P5/P2 limiter is active Copyright © GasTurb GmbH

Control Schedules Copyright © GasTurb GmbH De-select the P5Limiter Copyright © GasTurb GmbH Open “Schedules” Besides single valued limiters you can also employ Control Schedules

Defining a Control Schedule Select the parameter to be controlled Select the parameter from which the controlled parameter depends Close the schedule window Click to activate the schedule Plot the schedule Enter values Copyright © GasTurb GmbH

Changing Ambient Temperature Run the Off-Design cycle Click “alt, Mach, dtamb” Delta T from ISA = 11.85K yields at sea level static conditions T2=300K Copyright © GasTurb GmbH

Control System Simulation Tutorial T5 Follows the Schedule Remember: T2 = 300K yields as scheduled T5 = 1110K. Copyright © GasTurb GmbH This slide ends the Control System Simulation Tutorial