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Experimental Study on Thermal Balance of Regulated Two-Stage Turbocharged Diesel Engine at Variable Altitudes

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Abstract

It is significant to study thermal balance of diesel engine under different variable geometry turbocharger (VGT) vane openings at variable altitudes, which is helpful to assess the heat distribution, control the heat load and improve the heat efficiency of the diesel engine. A thermal balance test system was built to study the influence of the VGT vane opening angles on a regulated two-stage turbocharged (RTST) diesel engine’s thermal balance performance. The experiment was conducted under full load operating conditions at different altitudes (0 m, 3500 m and 5500 m). Results indicated that the heat load of engine increased and the thermal efficiency decreased with the increase of altitudes under all operating conditions. As the VGT vane openings increased, the exhaust and maximum combustion temperature increased, while the maximum cylinder combustion pressure decreased. In particular, the maximum combustion temperature was more than 2000 K when the VGT vane openings were greater than 70% at the altitude of 5500 m, and the maximum combustion pressure exceeded 17 MPa when the opening of VGT vane was 70% at 0 m. The thermal efficiency of the engine decreased with the increase of VGT vane openings at the altitudes of 0 m and 5500 m, but the thermal efficiency increased and then decreased at the altitude of 3500 m. It was finally obtained that the best openings of VGT vane was 80%, 60% and 50% under the engine speed of 2100 r/min at 0 m, 3500 m and 5500 m, respectively.

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Acknowledgement

This paper was supported by Machinery Industry Key Laboratory of Engine Plateau Adaptation.

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Authors and Affiliations

  1. Machinery Industry Key Laboratory for Engine Plateau Adaptation, Army Military Transportation University, Tianjin, 300161, China

    Ruilin Liu

  2. College of Power Engineering, Naval University of Engineering, Wuhan, 430033, China

    Ruilin Liu & Chunhao Yang

  3. Department of Military Vehicle, Army Military Transportation University, Tianjin, 300161, China

    Zhongjie Zhang, Yufei Jiao & Guangmeng Zhou

Authors
  1. Ruilin Liu
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  2. Chunhao Yang
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  3. Zhongjie Zhang
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  4. Yufei Jiao
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  5. Guangmeng Zhou
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Corresponding author

Correspondence to Chunhao Yang.

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Liu, R., Yang, C., Zhang, Z. et al. Experimental Study on Thermal Balance of Regulated Two-Stage Turbocharged Diesel Engine at Variable Altitudes. J. Therm. Sci. 28, 682–694 (2019). https://doi.org/10.1007/s11630-019-1151-3

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  • DOI: https://doi.org/10.1007/s11630-019-1151-3

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