A Methodology to Extend the Altitude Adaptability of a Turbocharged Heavy-Duty Diesel Engine

Gu, Yuncheng; Ma, Zetai; Zhu, Sipeng; Yang, Mingyang; Deng, Kangyao

doi:10.1007/s12239-021-0076-5

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…This is consistent with the findings that the distribution of exhaust energy is shifted to LPT at high load conditions in literature. 12 This is resulted from the quasi-steady behaviour of the two-stage turbine. Thirdly, the pulse magnitude of LPT reduces notably with engine speed, while it remains similar for HPT.…”

Section: Discussion On Experimental Resultsmentioning

confidence: 99%

“…This is consistent with the findings that the distribution of exhaust energy is shifted to LPT at high load conditions in literature. 12…”

Section: Experimental Methodsmentioning

confidence: 99%

“…9,10 Researches have already been carried out on the performance of coupled turbines in multistage turbocharging system. Yang et al 11 and Gu et al 12 investigated the division of available energy between two stages of turbine in a regulated two-stage turbocharging system in a diesel engine. It is confirmed that the flow availability of low-pressure turbine (LPT) increases proportionally with the total availability of two-stage turbine, while the increase of the flow availability becomes saturated gradually for high-pressure turbine (HPT).…”

Section: Introductionmentioning

confidence: 99%

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Study on gasdynamic interaction in a regulated two-stage turbocharging turbines at pulsating conditions

Yang

Xue

Zhou

et al. 2023

International Journal of Engine Research

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Understanding the response of performance of two-stage turbine to pulsating flow in exhaust manifold system is essential for performance improvement of engine. This paper studies unsteady interaction of two turbines in a two-stage turbocharging system via experimental method and a reduced order model. Firstly, experimental results of the unsteady pressure ratio of two turbines are discussed in cases with different engine speeds, engine loads, and bypass valve openings. Results show that the pressure ratio distribution between two turbines is profoundly influenced by the engine condition. The pressure ratio of low-pressure turbine (LPT) increases consistently with the engine speed and load, while it increases slightly or even remains unchanged for high-pressure turbine (HPT). HPT is de-loaded when the bypass valve is open, and there are large numbers of fluctuations with high frequencies in the trace of pressure ratio when the bypass valve is open. Next, a reduced order model of the two-stage turbine is established for turbine responses at pulsating conditions, and model validations of performance and unsteady pressure in two-stage turbine all show high precision. Finally, the model is applied for performance analysis of two-stage turbine system under pulsating conditions. The results show that with the increase in engine speed, load or bypass valve opening, the hysteresis loops of both turbines are expanded around the steady performance curve. However, the deviation of cycle-average performance from steady case for two turbines is notably different. LPT shows a stronger throttling effect at pulsating inflows. Moreover, compared with steady performance for whole two-stage turbine, cycle-average performance is reduced for all pulsating cases, especially for cases of open valve. The differences in turbine performance of two-stage turbine system caused by gasdynamic coupling effect of two turbines are suggested to be considered in the turbo-engine matching.

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Section: Discussion On Experimental Resultsmentioning

confidence: 99%

“…This is consistent with the findings that the distribution of exhaust energy is shifted to LPT at high load conditions in literature. 12…”

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on gasdynamic interaction in a regulated two-stage turbocharging turbines at pulsating conditions

Yang

Xue

Zhou

et al. 2023

International Journal of Engine Research

Self Cite

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“…The global expansion ratio increased with increase in altitudes and reached 4.9 at 5,500 m. Jia et al (2022) found that as the flight altitude rises from 0 km to 21 km, the Reynolds number reduces, the working lines approach the surge lines, and the maximum mass flow rate and the efficiency of the engine components gradually decrease. Gu et al (2021) announced that the altitude adaptability of the engine is notably improved by adapting the proposed method, especially for the twostage turbocharging system. found that the maximum intake density, coupled with fuel injection strategy, would achieve the lowest fuel consumption under a part-load condition and the largest torque corresponding to the minimum air-fuel ratio under a full-load condition.…”

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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The effect of high altitude environment on diesel engine performance: Comparison of engine operations in Hangzhou, Kunming and Lhasa cities

Liu

Zhang

et al. 2022

Chemosphere

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A Methodology to Extend the Altitude Adaptability of a Turbocharged Heavy-Duty Diesel Engine

Cited by 5 publications

References 24 publications

Study on gasdynamic interaction in a regulated two-stage turbocharging turbines at pulsating conditions

Study on gasdynamic interaction in a regulated two-stage turbocharging turbines at pulsating conditions

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

The effect of high altitude environment on diesel engine performance: Comparison of engine operations in Hangzhou, Kunming and Lhasa cities

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