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Effect of Bypass Ratio on Optimal Fan Outer Pressure Ratio and Performance for Turbofan Engines

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Abstract

This study was carried out to explore the effect of bypass ratio on optimal fan outer pressure ratio and the performance of turbofan engine with the same engine core. The member of Rolls-Royce Trent family, Trent-XWB, is chosen as the baseline engine. Based on the published data, a model for the simulation of engine performance was set up. Then, a series of engine models with different bypass ratios were established based on the same Trent-XWB engine core and the way to get optimal fan outer pressure ratio was derived. It was concluded that for the fixed engine core, when the bypass ratio was chosen, there would be one optimal outer pressure ratio existing which could make the thrust maximum and the specific fuel consumption reach minimum. By comparing the performance of the turbofan engines with different bypass ratios, it shows that the increase of bypass ratio results in higher thrust and lower specific fuel consumption. However, the additional cost like the increase of both drag and weight needs to be taken into account at the preliminary design stage in practice.

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Abbreviations

BPR:

Bypass ratio

COT:

Combustor outlet temperature

FIPR:

Fan inner pressure ratio

FOPR:

Fan outer pressure ratio

HPCPR:

High pressure compressor pressure ratio

IPCPR:

Intermediate pressure compressor pressure ratio

IPC:

Intermediate pressure compressor

ISA:

International standard atmosphere

LP:

Low pressure

OPR:

Overall pressure ratio

PR:

Pressure ratio

SFC:

Specific fuel consumption

SLS:

Sea level static

W :

Air mass flow rate

References

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  10. Jun J (2014) Fan noise reduction for high bypass ratio turbofan engines, MsC Thesis, School of engineering, Cranfield University.

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Funding

This work has been supported by the National Natural Science Foundation of China (Grant No. 51706170) and China Postdoctoral Science Foundation (Grant no. 2017M623185).

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Authors and Affiliations

  1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Laboratory for Vibration Control of Aerospace Structures, School of Aerospace, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Rui Xue

  2. AECC Xi’an Aero-Engine Control Company, Xi’an, 710077, People’s Republic of China

    Rui Xue & Jun Jiang

  3. Centre for Propulsion Engineering, Cranfield University, Bedfordshire, MK43 0AL, UK

    Anthony Jackson

Authors
  1. Rui Xue
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  2. Jun Jiang
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  3. Anthony Jackson
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Corresponding author

Correspondence to Rui Xue.

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The authors declare that there is no conflict of interest.

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Xue, R., Jiang, J. & Jackson, A. Effect of Bypass Ratio on Optimal Fan Outer Pressure Ratio and Performance for Turbofan Engines. Int. J. Aeronaut. Space Sci. 20, 157–164 (2019). https://doi.org/10.1007/s42405-018-0134-z

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  • DOI: https://doi.org/10.1007/s42405-018-0134-z

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