Effect of Intake Air Humidification and EGR on Combustion and Emission Characteristics of Marine Diesel Engine at Advanced Injection Timing

Wang, Ke; Zhao, Chunhua; Cai, Yujie

doi:10.1007/s11630-021-1460-1

Cited by 10 publications

(5 citation statements)

References 28 publications

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“…They found a wide application in stationary and transport energy plants. Fuel efficiency of gas turbines [31,32], diesel engines, and gas engines [33,34] decrease with increasing air temperature at the inlet [35,36].…”

Section: Literature Reviewmentioning

confidence: 99%

Research of hydrodynamic processes in the flow part of a low-flow thermopressor

Konovalov,

Kobalava,

Radchenko

et al. 2024

Journal of Energy Systems

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This research explores the hydrodynamic processes within the flow section of a low-flow thermopressor as a jet-type heat exchanger that utilizes the instantaneous evaporation of highly dispersed liquid in accelerated superheated gas flow resulting in reducing gas temperature with minimum resistance losses in contrast to conventional surface heat exchanger. The efficiency of thermopressor, as a contact heat exchanger, is highly dependent on the design of the flow section and the water injection nozzle. Geometric characteristics perform a crucial role in shaping gas-dynamic processes along the length of the thermopressor's flow section, influenced by resistance losses and local resistance in the tapering and expanding channel segments. Therefore, the optimum thermopressor design has to ensure minimize pressure losses. Using Computational Fluid Dynamics (CFD), the prototype thermopressor models were simulated and the results were compared with experimental data. The empirical equations for local resistance coefficients of thermopressor diffuser and confuser were received to evaluate the impact of various design parameters. The obtained local resistance coefficients for the confuser ranged from 0.02 to 0.08 and for the diffuser – from 0.08 to 0.32. The practical recommendations on geometric and operating parameters and characteristics for enhancing the efficiency of hydrodynamic processes in thermopressor flow part were given.

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Section: Literature Reviewmentioning

confidence: 99%

Research of hydrodynamic processes in the flow part of a low-flow thermopressor

Konovalov,

Kobalava,

Radchenko

et al. 2024

Journal of Energy Systems

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“…Therefore, it is necessary to evaluate whether the induced structure can reduce energy loss. In previous studies, [35][36][37] the energy loss due to EGR is usually evaluated indirectly using the engine efficiency and the brake specific fuel consumption (BSFC), it has rarely been evaluated individually, except for Venturi EGR. Because the Venturi EGR needs to design the Venturi mixer, many researchers have studied the total pressure loss of the Venturi mixer.…”

Section: Total Pressure Loss Comparison Between Compressor With Induc...mentioning

confidence: 99%

Effect of the design parameters of induced structures on the sensitivity of compressor efficiency and static pressure of induced structure inlets

Zhu

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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A gas-entraining diffuser exhaust gas recirculation (EGR) was proposed to induce the entry of the exhaust gas into the diffuser, to completely utilize the lower static pressure at the diffuser for reducing engine fuel consumption owing to the low engine backpressure. Thus, the induced structure was designed such that a large amount of exhaust gas enters the compressor diffuser. To improve the compressor efficiency and reduce the static pressure at the induced structure inlet, the design parameters of the induced structure (induced angle, induced effective inlet area, parallel part width, and position of the induced structure inlet) were investigated using numerical methods. The results show that the peak compressor efficiency reduced by 4% compared with the compressor prototype, and up to 90% of the compressor efficiency reduction is attributed to the induced gas entering the diffuser, except for the 10% induced gas ratio scenario over the near-choking point. This is because the entropy generation of the induced structure is close to 10% of the entropy generation increase in the diffuser system due to the induced gas at a medium flow rate. Second, in most cases, the compressor efficiency and static pressure of the induced structure inlet increase or decrease simultaneously as the design parameters vary. To select the best induced structure, it is necessary to compromise between the compressor efficiency and static pressure of the induced structure inlet. In fact, the compressor efficiency changes by less than 1% by varying the design parameters of the induced structure, compared with case ID1. This demonstrates that the design parameters have little effect on the compressor efficiency. Compared with the compressor efficiency, the static pressure of the induced structure inlet is more sensitive to the design parameters, particularly the induced effective inlet area and the position of the induced structure inlet.

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“…This would lead to an augmented operating range as a higher amount of fuel could be used. Coupled with air humidification [18] and EGR [19], oxy-fuel combustion was able to reduce soot and NO 𝑥 emissions in diesel engines. Zhou et al carried out an experimental campaign in a single-cylinder downsized SI engine with different rates of oxygen fractions (15% to 27%) and their results highlight that for low loads, oxygen enrichment has a real potential to improve fuel efficiency, whereas for relatively high IMEP, N2 dilution still remains necessary [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of methane combustion in a HCCI engine under enriched oxygen conditions

Spanò,

Savarese,

Parente

et al. 2024

Fuel

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Effect of Intake Air Humidification and EGR on Combustion and Emission Characteristics of Marine Diesel Engine at Advanced Injection Timing

Cited by 10 publications

References 28 publications

Research of hydrodynamic processes in the flow part of a low-flow thermopressor

Research of hydrodynamic processes in the flow part of a low-flow thermopressor

Effect of the design parameters of induced structures on the sensitivity of compressor efficiency and static pressure of induced structure inlets

Experimental and numerical investigation of methane combustion in a HCCI engine under enriched oxygen conditions

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