Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure

Huang, Li; Liu, Junjie; Li, Rui; Wang, Yan; Liu, Long

doi:10.3390/machines10100919

Cited by 3 publications

(1 citation statement)

References 25 publications

(27 reference statements)

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“…The findings suggest that EBP increment causes the retarding of combustion phases. Huang et al 12 conducted an experimental investigation on the combustion and performance of diesel engines under high EBP. The study aimed to explore the effects of two high EBP conditions (10 kPa and 25 kPa) on the performance of medium-speed ship engines under different loads through experiments.…”

Section: Introductionmentioning

confidence: 99%

The role of advancing fuel injection timing in mitigating the negative impact of exhaust back-pressure on diesel engines’ performance

Gülmez

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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This study investigated the negative impact of exhaust back-pressure (EBP) on diesel engine performance and how it can be mitigated by advancing fuel injection timing (FIT). Experiments were conducted on a diesel engine with various EBP and FIT settings, and the impact of these factors on engine performance was evaluated under a constant load. The results showed that increasing EBP delayed the combustion process, resulted in longer ignition delay periods, and decreased engine efficiency. However, by advancing FIT, these negative effects could be mitigated to some extent. Specifically, advancing FIT led to shorter ignition delay periods, improved combustion rate, and earlier maximum pressure values. The study highlights the potential of controlling FIT as a promising approach to reduce the negative impact of EBP on diesel engine performance and environmental impact. The results of the study have practical implications for diesel engine operators seeking to offset the negative impact of EBP resulting from the integration of waste heat recovery or aftertreatment systems in the exhaust system, which is aimed at improving the efficiency and reducing the environmental footprint of diesel engines.

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Section: Introductionmentioning

confidence: 99%

The role of advancing fuel injection timing in mitigating the negative impact of exhaust back-pressure on diesel engines’ performance

Gülmez

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Conversion of a Spark-Ignition Gasoline Engine to Syngas: Assessment of Technical and Economic Indicators Based on Numerical Modeling

Plotnikov,

Krasilnikov,

Davydov

et al. 2023

2023 Belarusian-Ural-Siberian Smart Energy Conference (BUSSEC)

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Experimental and simulation study of energy loss mechanism of low pressure ratio radial turbine

Xie,

Yang,

Zhang

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part D:

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Low-pressure ratio conditions are commonly encountered in radial turbines. When operating at low pressure ratio condition, a significant portion of the turbine energy loss occurs as residual velocity loss in the form of swirling flow at the outlet pipe. Typically, this energy can be recovered by the next stage turbine or reduced by the diffuser. However, there is a lack of experimental and simulation studies on the swirling flow at the outlet of turbines. The mechanism governing the changing pattern of swirling flow remains unclear, limiting the effective utilization and reduction of residual velocity loss. This study conducts theoretical and experimental research on turbine outlet swirling flow. Firstly, this paper introduces a novel two-dimensional hot-wire anemometry stepping mechanism for measuring swirling flow at a turbine outlet cross-section. Experimental results demonstrate that the proposed measurement method effectively captures the morphological changes of turbine outlet swirling flow. The results indicate a strong coupling relationship between axial and circumferential velocity. Subsequently, to elucidate the reasons for the coupling of velocity in two directions and the development of swirling flow in the outlet pipeline, simulations of turbine performance under different velocity ratio conditions were conducted. Results show that under a wide range of velocity ratios, not only does the direction of the turbine outlet swirling flow change, but it also leads to the swirl number exceeding the critical swirl ratio under high velocity ratio conditions, resulting in the formation of a central recirculation zone (CRZ) at the pipe outlet. The main cause of the strong coupling effect between velocities in two directions is attributed to the increased swirl intensity leading to enhanced adverse pressure gradients at the core of the vortex. Lastly, a model describing the variation of VGT turbine outlet swirling flow is established, indicating a linear relationship between the swirl number and the velocity ratio, with a steeper change as the pressure ratio decreases.

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Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure

Cited by 3 publications

References 25 publications

The role of advancing fuel injection timing in mitigating the negative impact of exhaust back-pressure on diesel engines’ performance

The role of advancing fuel injection timing in mitigating the negative impact of exhaust back-pressure on diesel engines’ performance

Conversion of a Spark-Ignition Gasoline Engine to Syngas: Assessment of Technical and Economic Indicators Based on Numerical Modeling

Experimental and simulation study of energy loss mechanism of low pressure ratio radial turbine

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