A Numerical Study on the Effects of Exhaust Gas Recirculation Temperature on Controlling Combustion and Emissions of a Diesel Engine running on HCCI Combustion Mode

Rather, Mushtaq Ahmad; Wani, M. Marouf

doi:10.30939/ijastech..451574

Cited by 19 publications

(6 citation statements)

References 19 publications

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“…Ali et al [50] studied a numerical analysis to control the combustion performance of a syngas-fueled HCCI engine using different piston bowl geometry and EGR. In addition, Rather and Wani [51], [52] also studied a numerical analysis on EGR temperature's effects on combustion and emissions performance. By the application of wet ethanol, Herzer et al [53] observed the chemical kinetic mechanisms for combustion with EGR.…”

Section: Approach To Achieving Cai Combustion In Gasoline Enginesmentioning

confidence: 99%

Strategies to achieve controlled auto-ignition (CAI) combustion: A review

Veza

Setiawan²,

Firman³

et al. 2022

Mech. Eng. for Soc. and Ind.

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Conventional gasoline engines suffer from low performance and NOx emissions. Controlled auto-ignition (CAI), sometimes referred to as homogeneous charge compression ignition (HCCI), is a promising concept to solve such problems. CAI has the potential to improve spark ignition (SI) engine fuel economy while at the same time solving the trade-off of NOx-soot emissions found in compression ignition (CI) engines. The CAI engine can reach a fuel economy comparable to that of a conventional diesel engine with ultra-low NOx and negligible soot emissions. However, controlling auto-ignition remains the biggest difficulty that hinders the implementation of CAI as a commercial engine. Research towards a cleaner and more efficient engine is driven by the progressively stringent emission regulation imposed worldwide. Therefore, the CAI was developed to meet the emissions target while maintaining engine performance. CAI works on the principle of lean mixture and auto-ignition. To obtain CAI combustion, the temperatures in the cylinder must be sufficient to initiate auto-ignition. Without the use of a spark plug or injector, the CAI suffers from a direct control mechanism to start the combustion. The most practical approach to controlling the initiation of auto-ignition in CAI is diluting the intake charge by either trapping the residual gas or recirculating the exhaust gas. Both approaches enable the engine to achieve CAI combustion without requiring significant modifications to control the onset of CAI combustion phase.

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Section: Approach To Achieving Cai Combustion In Gasoline Enginesmentioning

confidence: 99%

Strategies to achieve controlled auto-ignition (CAI) combustion: A review

Veza

Setiawan²,

Firman³

et al. 2022

Mech. Eng. for Soc. and Ind.

View full text Add to dashboard Cite

show abstract

“…The latest Computer Fluid Dynamic (CFD) software employs a highly efficient coupling of detailed chemical kinetics, liquid fuel spray and turbulent gas dynamics in order to simulate combustion processes occurring in an internal combustion engine. However, the majority studies on the piston geometry conducted in the CFD approach have focused on CI engines [20,30,31]. Regarding the HCCI-PFI engine, most studies have yet to be conducted on the piston bowl geometry design [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines

Nik Muhammad Hafiz Nik Ab Rashid,

Abdul Aziz Hairuddin,

Khairil Anas Md Rezali

et al. 2024

ARNHT

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Homogeneous charge compression ignition (HCCI) is an advanced combustion strategy proposed to provide higher efficiency and lower emissions than conventional compression ignition. Nevertheless, the operation of HCCI engines still presents formidable challenges. Preparing homogeneous mixtures and controlling the combustion phase are crucial challenges in the context of engine performance. Piston bowl geometry significantly enhances the process by improving the flow and facilitating air-fuel mixing for combustion. On that note, this study utilised the CFD simulation methods to analyse HCCI combustion in port fuel injection (PFI) mode and evaluate the effect of piston bowl geometries on engine performance. For this purpose, the CFD simulation result for a single-cylinder, four-stroke YANMAR diesel engine was validated with experimental data. The different piston bowl geometries with the same volume, compression, and equivalence ratio were then investigated numerically. The validation result of the CFD simulation offers enough confidence to continue the study with different piston bowl geometries. The results attained from the Direct Injection (DI) engine piston bowl application demonstrate a minor change in in-cylinder pressure and heat release rate. The piston bowl design employed in a Port Fuel Injection engine application exhibited different combustion phases while demonstrating similarity in attaining in-cylinder pressure. The findings for swirl induce piston bowl design indicate an enhancement of in-cylinder pressure for the Spiral Crown geometry model, reaching 9.42 MPa. The results of the study demonstrated that the piston bowl's design affected the performance of an HCCI engine.

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“…One recent method is to use alternative fuels for gasoline and diesel on internal combustion engines [5][6][7][8]. Exhaust gas recirculation (EGR) is another effective method for low emission rates on diesel engine systems [9,10]. Researchers examine advanced combustion techniques to improve emission rates as well [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Intake Valve Lift Form Modulation on Exhaust Temperature and Fuel Economy of a Low-loaded Automotive Diesel Engine

Başaran

2021

International Journal of Automotive Science and Technology

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Exhaust after-treatment (EAT) systems on automotive vehicles cannot perform effectively at low loads due to low exhaust temperatures (Texhaust < 250 o C). Conventional late intake valve closure (LIVC) technique -a proven method to improve diesel exhaust temperatures -generally requires the modulation of the whole valve lift profile. However, an alternative method -boot-shaped LIVC -only needs partial lift form modulation and can rise exhaust temperatures significantly. Therefore, this study attempts to demonstrate that boot-shaped LIVC can be an alternative solution to improve exhaust temperatures above 250 o C at low-loaded operations of automotive vehicles.A 1-D engine simulation program is used to model the diesel engine system operating at 1200 RPM engine speed and at 2.5 bar brake mean effective pressure (BMEP) engine load. Boot-shaped LIVC is achieved via keeping the valve lift constant (at 4.0 mm) for a while during closure and then closing it at different closure angles. The method results in up to 55 o C exhaust temperature rise through reduced in-cylinder airflow and thus, is adequate to keep EAT system above 250 o C at low loads. The longer the boot is kept during closure, the lower the air-to-fuel ratio is reduced and the higher the exhaust temperature flows at turbine exit. Similar to conventional LIVC, boot-shaped LIVC improves fuel consumption as pumping losses are decreased in the system. Despite aforementioned improvements, EAT warm-up is affected negatively due to the significant drop-off on exhaust mass flow rates. The need to modify only some parts of the lift profile is a technical advantage and can reduce production costs.

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A Numerical Study on the Effects of Exhaust Gas Recirculation Temperature on Controlling Combustion and Emissions of a Diesel Engine running on HCCI Combustion Mode

Cited by 19 publications

References 19 publications

Strategies to achieve controlled auto-ignition (CAI) combustion: A review

Strategies to achieve controlled auto-ignition (CAI) combustion: A review

Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines

Effects of Intake Valve Lift Form Modulation on Exhaust Temperature and Fuel Economy of a Low-loaded Automotive Diesel Engine

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