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

Liu, Ruilin; Yang, Can; Zhang, Zhongjie; Jiao, Yufei; Zhou, Guanghui

doi:10.1007/s11630-019-1151-3

Cited by 18 publications

(7 citation statements)

References 13 publications

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“…Studies have also shown that a fixed turbocharger cannot meet the intake air demand of engines at different altitudes [25]. For single-stage turbocharging systems operating at high altitudes, the turbocharger tends to be overspeed, and then the efficiency will decrease greatly due to turbo blocks [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

A Strategy to Control the Turbocharger Energy of a Diesel Engine at Different Altitudes

Cheng¹,

Li²,

Shi³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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Power deterioration is a major problem for diesel engines operating at high altitudes. This problem stems from the limited availability of turbocharger energy, which is not enough to increase the boost pressure to the required level. In this study, a control strategy is introduced in order to achieve engine power recovery at different altitudes. It is shown that as the altitude increases from 0 to 4500 m, the required boost pressure ratio increases from 2.4 to 4.3. The needed turbocharger energy should be increased accordingly by 240%, and the TCC (turbine characterization coefficient) should be adjusted within wide ranges. A 12% decrease in the TCC can lead to a rise of the intake air pressure, which can compensate the pressure decrease due to a 1000 m altitude increase. The fluctuation range of boost pressure was within 14.5 kPa for variations in altitude from 0 to 4500 m.

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Section: Introductionmentioning

confidence: 99%

A Strategy to Control the Turbocharger Energy of a Diesel Engine at Different Altitudes

Cheng¹,

Li²,

Shi³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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“…Yang et al (2018) showed that the variable geometry turbocharging (VGT) has the best altitude adaptability that can achieve the highest operational altitude for power recovery and BSFC control. Liu et al (2019) found that the thermal efficiency of the engine decreased with the increase of VGT vane openings at the altitudes of 0 m and 5,500 m, but the thermal efficiency increased and then decreased at the altitude of 3,500 m; Wang et al (2019) showed that the rated power at an altitude of 1920 m proved to be recovered to that at sea level though optimizing the injection quantity, injection timing, injection pressure, and variable nozzle turbocharger (VNT) opening. Zhang et al (2019) showed that the optimal openings of high-pressure and low-pressure VGT vanes decreased with increase in altitudes.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on effects of fuel injection and intake parameters on combustion and performance of a turbocharged diesel engine at different altitudes

Wan

Huang²,

Shen³

et al. 2023

Front. Energy Res.

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Matching characteristics between fuel injection and intake control parameters significantly affect overall performances in diesel engine at variable altitudes. Prior to optimizing the control parameters of diesel engines operating at high altitudes areas, there is a necessity to identify the influence law of fuel injection and intake parameters on engine performance. This study focused on the effects of main injection timing (MIT), fuel injection pressure (FIP), EGR rate, and variable nozzle turbocharger (VNT) opening on the combustion, performances and NOx and smoke emissions in a turbocharged diesel engine at different altitudes (2000, 1,000, and 0 m). Strategies for optimization of engine performance and the coupling relationship between these parameters were analyzed. The results showed that as the altitude increased from 0 m to 2000 m, the engine torque dropped by 2.9%, the BSFC increased by 2.6%, the NOx emissions reduced by 11.8%, and the opacity smoke increased by 26.2%. The effects of MIT, FIP, EGR rate and VNT opening on engine performances were more significant at high altitudes. As the MIT was advanced at 2000 m altitude, the engine torque increased by 5.6%, the BSFC reduced by 5.9%, the opacity smoke decreased by 55%, while the NOx emissions increased by 54%%. Advance the injection timing properly can overcome the altitude effect on engine power. With the FIP increased from 105 to 130 MPa at 2000 m, the engine torque reduced by 1.7%, the BSFC increased by 1.6%, the opacity smoke dropped by 44.5%, and the NOx emissions increased by 17.5%. When the EGR rate increases by 5%, the NOx emission reduces by 16.4%,17.9 and 21.9 respectively at 0, 1,000 and 2000 m altitude. The EGR rate should be properly reduced to obtain the recovery of engine power at plateau. As the VNT vane opening decreased from 40% to 20%, the NOx emission increase by 9.4% and 9.9% at 0 m and 1,000 m respectively, and it reduces by 3.9% at 2000 m, while the opacity smoke reduces by 38.9% at different altitudes. The optimization of VNT vane opening requires a balance between combustion performance and pumping losses. The multi-objective collaborative optimization technique should be applied to optimize these parameters to help improve engine efficiency and emissions at high altitudes.

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“…In many of these studies, changes in engine cooling and thermal needs were considered. [36][37][38][39] The analysis of heat balance includes the study of the processes of energy conversion and heat transfer in an engine from the perspective of system integration, which can provide a basis for improving the cooling system and thermal efficiency of engines. [40][41][42] The cooling system plays an important role in controlling the thermal load, heat balance, and performance of a diesel engine.…”

Section: Introductionmentioning

confidence: 99%

Multiobjective optimization of the cooling system of a marine diesel engine

Zhang

Zeng

2021

Energy Science & Engineering

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

Cited by 18 publications

References 13 publications

A Strategy to Control the Turbocharger Energy of a Diesel Engine at Different Altitudes

A Strategy to Control the Turbocharger Energy of a Diesel Engine at Different Altitudes

Experimental investigation on effects of fuel injection and intake parameters on combustion and performance of a turbocharged diesel engine at different altitudes

Multiobjective optimization of the cooling system of a marine diesel engine

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