Abstract
This research aims to propose a method to achieve the maximum altitude adaptability of turbocharged diesel engines with the optimum fuel consumption. Firstly, engine performance at different altitudes is studied by experimental method. It is found that the engine power recovery is restricted by three constraints, which are cylinder pressure, exhaust temperature and boosting pressure ratio. Following that, the influence of turbocharging system and fuel injection on the three constraints is studied via experimentally validated numerical model. A power-recovery-zone bounded by the three constraints is proposed, inside which engine power can be fully recovered. The altitude adaptability of the engine is discussed in details via this zone. Further analysis finds that the boosting pressure and the maximum pressure ratio are the key factors to the constraints. A new methodology which can achieve the maximum altitude with the optimum fuel consumption is proposed based the concept of the zone. Finally, the methodology is applied in the engine with three types of turbocharging systems to quantitatively compare their altitude adaptability. Results prove that the altitude adaptability of the engine is notably improved by adapting the proposed method, especially for the two stage turbocharging system.
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Abbreviations
- A:
-
turbine effective area, mm2
- BMEP:
-
brake mean effective pressure, bar
- BSFC:
-
brake specific fuel consumption, g/(kWh)
- FG:
-
fix geometry turbine or turbocharging system
- H:
-
altitude or altitude adaptability, km
- HPC:
-
high pressure compressor
- IMEP:
-
indicated mean effective pressure, bar
- LPC:
-
low pressure compressor
- m:
-
mass flow rate
- P:
-
pressure, bar
- PR:
-
pressure ratio
- PRZ:
-
power-recovery-zone
- T:
-
turbine or temperature, K
- VGT:
-
variable geometry turbine
- WG:
-
waste gate
- 0:
-
ambient or original value of a parameter
- c:
-
compressor
- cor:
-
corrected
- cyl:
-
cylinder
- H:
-
high altitude
- max:
-
maximum
- min:
-
minimum
- T:
-
turbine inlet
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Acknowledgement
The research is supported by the National Natural Science Foundation of China (NSFC, No. 51606121).
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Gu, Y., Ma, Z., Zhu, S. et al. A Methodology to Extend the Altitude Adaptability of a Turbocharged Heavy-Duty Diesel Engine. Int.J Automot. Technol. 22, 837–852 (2021). https://doi.org/10.1007/s12239-021-0076-5
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DOI: https://doi.org/10.1007/s12239-021-0076-5