Investigation on Effect of Offset Orifice Nozzle under Multi Pulse UltrahighPressure Injection and PPC Combustion Conditions

Ewphun, Pop-Paul; Otake, Miku; Nagasawa, Tsuyoshi; Kosaka, Hidenori; Sato, Susumu

doi:10.20485/jsaeijae.11.1_1

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Furthermore, the partially premixed mixtures had sufficient mixing time to blend better near or below the layering measurement (white line). Therefore, the mixed composition formed in SOI-3 will rapidly increase the pressure rise rate (Ewphun et al, 2020). The injection pressure is less than 800 bar, which is a normal Diesel cycle, and in the case of a high spray pressure of 1600 bar, it is a typical PPCI cycle -partial pre-mixed compression combustion.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Research on Numerical Simulation of Pcci Engine: A Review

Minh Tuan,

Dao Nam

2023

J. tech. innov.

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The global environment is being affected by the use of fossil fuels to provide energy for internal combustion engines (ICE) due to a large amount of CO2 emission. Specific toxic substances are NOx, and CO, soot, particulate matter that exists in the environment at high densities while having a global impact. The automotive industry of countries worldwide is constantly changing and evolving to discover new solutions that reduce fuel use while developing cleaner and more advanced combustion methods, which as a low-temperature combustion engine (LTC). This study uses computational fluid dynamics (CFD) to understand partial pre-mixed compression combustion (PPCI), with HCCI and RCCI being advanced low-temperature combustion concepts. Lowering the average combustion temperature is an advantage of PCCI; it optimizes CO and NOx emission rates while maintaining high thermal efficiency. Investigate the intake pattern, including flame length, mixing pulse, and intake air volume, to determine the importance of that factor for oxidation using the LES. Studies have been performed using RANS and LES models to stimulate mixing and combustion.

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Section: Boundary Conditionsmentioning

confidence: 99%

Research on Numerical Simulation of Pcci Engine: A Review

Minh Tuan,

Dao Nam

2023

J. tech. innov.

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“…Furthermore, the design of the nozzle orifice's influence on the combustion characteristics was investigated by Ewphun et al [309] under PCCI mode conditions and multi-pulse "ultra-high-pressure injection". The experiments were performed on a "single-cylinder" engine at 0.55 MPa IMEP g at 1750 rpm, where the injection pulses were three pulses equally mass for the main injection at injection pressures of 1500, 2000, 2500, 3000, and 3500 bar.…”

Section: Ultra-high-pressure Injectionmentioning

confidence: 99%

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

2022

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Improving thermal efficiency and reducing carbon emissions are the permanent themes for internal combustion (IC) engines. In the past decades, various advanced strategies have been proposed to achieve higher efficiency and cleaner combustion with the increasingly stringent fuel economy and emission regulations. This article reviews the recent progress in the improvement of thermal efficiency of IC engines and provides a comprehensive summary of the latest research on thermal efficiency from aspects of thermodynamic cycles, gas exchange systems, advanced combustion strategies, and thermal and energy management. Meanwhile, the remaining challenges in different modules are also discussed. It shows that with the development of advanced technologies, it is highly positive to achieve 55% and even over 60% in effective thermal efficiency for IC engines. However, different technologies such as hybrid thermal cycles, variable intake systems, extreme condition combustion (manifesting low temperature, high pressure, and lean burning), and effective thermal and energy management are suggested to be closely integrated into the whole powertrains with highly developed electrification and intelligence.

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“…The parameters of the injection system and the injection characteristics have a very large influence on the combustion, emissions and performance of a compression ignition engine. The primary technique used in modern common rail injection diesel engines is the multiple injection method, which is used depending on the purpose to be served [21][22][23][24]. Depending on the engine speed and load, modern diesel engines have pilot injection, primary injection and secondary injection.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of the Effect of Air Filter Pressure Drop on the Composition and Emission Changes of a Compression Ignition Internal Combustion Engine

Dziubak

Karczewski

2022

Energies

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This paper presents an experimental evaluation of the effect of air filter pressure drop on the composition of exhaust gases and the operating parameters of a modern internal combustion Diesel engine. A literature analysis of the methods of reducing the emission of toxic components of exhaust gases from SI engines was conducted. It has been shown that the air filter pressure drop, increasing during the engine operation, causes a significant decrease in power output and an increase in fuel consumption, as well as smoke emission of Diesel engines with the classical injection system with a piston (sectional) in-line injection pump. It has also been shown, on the basis of a few literature studies, that the increase in the resistance of air filter flow causes a change in the composition of car combustion engines, with the effect of the air filter pressure drop on turbocharged engines being insignificant. A programme, and conditions of tests, on a dynamometer of a modern six-cylinder engine with displacement Vss = 15.8 dm3 and power rating 226 kW were prepared, regarding the influence of air filter pressure drop on the composition of exhaust gases and the parameters of its operation. For each technical state of the air filter, in the range of rotational speed n = 1000–2100 rpm, measurements of exhaust gas composition and emission were carried out, as well as measurements and calculations of engine-operating parameters, namely that of effective power. An increase in the pressure drop in the inlet system of a modern Diesel truck engine has no significant effect on the emissions of CO, CO2, HC and NOx to the atmosphere, nor does it cause significant changes in the degree of smoke opacity of exhaust gases in relation to its permissible value. An increase in air filter pressure drop from value Δpf = 0.580 kPa to Δpf = 2.024 kPa (by 1.66 kPa) causes a decrease in the maximum filling factor value from ηu = 2.5 to ηu = 2.39, that is by 4.5%, and a decrease in maximum power by 8.8%.

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Investigation on Effect of Offset Orifice Nozzle under Multi Pulse UltrahighPressure Injection and PPC Combustion Conditions

Cited by 5 publications

References 14 publications

Research on Numerical Simulation of Pcci Engine: A Review

Research on Numerical Simulation of Pcci Engine: A Review

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

Experimental Studies of the Effect of Air Filter Pressure Drop on the Composition and Emission Changes of a Compression Ignition Internal Combustion Engine

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