Simulation and Thermodynamic Analysis of Twin Spool Turbofan Engine at the On Design and Off Design Conditions

Document Type : Propulsion and Heat Transfer

Authors

1 emam hosein

2 malek ashtar

Abstract

At the present paper, thermodynamic simulation of a twin spool separate exhaust turbofan engine, at the on design and off design conditions is performed. At this engine, a part of air flow is extracted from the high pressure compressor in order to cool the turbine blades and provide cockpit air. Also, power is extracted from the fan to provide the power for accessories.  For the validation of developed thermodynamic model, the results are compared with CFM56-7B engine experimental outputs including: corrected low pressure spool speed, engine thrust, fuel flow rate, high pressure spool speed, and exhaust gas temperature of engine. Combination of engine revolution equations with thermodynamic cycle equations and preparing the results in the frame work of generalized thrust curves, which are the innovations of the current study,  demonstrate that the model has 12% error at most and can predict the off design behavior of the engine correctly. It is obtained that at the cruise condition, the bypass duct exit and core stream exit are chocked. The results show that in the case of inlet Mach number increasing, the bypass duct chocking sensitivity is more than core stream chocking sensitivity.  Moreover, positive ISA condition decreases the thrust and specific fuel consumption and negative ISA condition increases the thrust and specific fuel consumption.

Keywords

References

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Aerospace Mechanics
Volume 15, Issue 4 - Serial Number 58
December 2019
Pages 95-108

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History

  • Receive Date: 18 December 2017
  • Revise Date: 06 March 2018
  • Accept Date: 06 January 2019
  • Publish Date: 22 December 2019

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