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| Influences of Variable Nozzle Turbocharger (VNT) on Performance and Emission of Vehicle Diesel Engine operating at High Altitude |
| Received:June 01, 2017 Revised:October 15, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2017.10.003 |
| KeyWord:diesel engine high altitude variable nozzle turbocharger emission |
| Author | Institution |
| YANG Yong-zhong |
1.Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming , China; 2.Kunming Yunnei Power Co., Ltd, Kunming , China |
| SHEN Li-zhong |
Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming , China |
| BI Yu-hua |
Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming , China |
| LEI Ji-lin |
Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming , China |
| WANG Jun |
Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming , China |
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| Abstract: |
| To have systematic study on the influences of variable nozzle turbocharger (VNT) on the power, economy and emission performance of a vehicle diesel engine running in plateau area and to provide some theoretical guidance for the matching control of the electronic control diesel engine with VNT as well as reducing the pollutant emission of the diesel engine operating at high altitude. Methods The effect of VNT on diesel engine performance and emissions was researched by experiment at an altitude of about 1960m and at the typical operating conditions, such as low engine speed 1400 r/min full load, 2200r/m in full load (peak torque condition) and 4000 r/min full load (rated power condition). Results At low engine speed condition, with the increase of VNT nozzle opening, the power declined and the economy deteriorated. There was an optimal VNT nozzle opening which made the torque reach the peak value and the brake specific fuel consumption have the lowest value at peak torque condition and rated power condition respectively. With the increase of VNT nozzle opening, intake air mass flow rate, air-to-fuel ratio, compressor outlet gas pressure, compressor outlet gas temperature and turbine inlet gas pressure decreased; while the turbine inlet gas temperature increased. Brake specific nitrogen oxides (NOx) emission decreased gradually and smoke, brake specific carbon monoxide (CO) emission and brake specific hydrocarbon (HC) emission increased gradually along with the increase of VNT nozzle opening at these three typical operating conditions. In addition, VNT had little effect on HC emission. Conclusion In plateau regions, the turbine inlet gas temperature can be reduced by closing the VNT nozzle opening so as to decrease the thermal load of diesel engine and improve its reliability. Satisfactory brake specific NOx emission and smoke emission can be obtained by means of adjusting VNT nozzle opening reasonably. |
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