Impact of Using n-Octanol/Diesel Blends on the Performance and Emissions of a Direct-Injection Diesel Engine

Energies, Journal Year: 2024, Volume and Issue: 17(11), P. 2691 - 2691

Published: June 1, 2024

This study evaluates the viability of n-octanol as an alternative fuel in a direct-injection diesel engine, aiming to enhance sustainability and efficiency. Experiments fueled by different blends with pure were conducted analyze their impacts on engine performance emissions. The methodology involved testing each blend single-cylinder measuring parameters such brake torque power under full-load conditions across range speeds. Comparative assessments emission characteristics at constant speed also varying loads. results indicated that while consistently improved thermal efficiency, they increased brake-specific consumption due lower energy content n-octanol. Consequently, all reduced nitrogen oxide emissions compared diesel, significantly decreased carbon monoxide, hydrocarbons, smoke opacity, presenting comprehensive reduction harmful However, benefits came complex trade-offs: notably, higher concentrations led relative increase ratio increased. concludes improves efficiency reduces dependence, but optimizing is crucial balance improvements reductions.

Language: Английский

---

Novel Approach to Analyzing Friction Losses by Modeling the Microflow of Lubricating Oil between the Piston Rings and Cylinder in Internal Combustion Engines

Energies, Journal Year: 2024, Volume and Issue: 17(15), P. 3697 - 3697

Published: July 26, 2024

This work focuses on the evolution of lubrication wedge shaping in internal combustion piston engines, taking into account liquid microflows curved surfaces and coating microgeometries. It introduces a new approach to analysis friction losses by simulating microflow lubricating oil between rings cooperating with cylinder surface. The models used take three types microgeometry material expansion. Key results indicate that microirregularities stereometry 0.1–0.2 µm significantly influence distribution film thickness phase maximum working pressure, which is critical for functioning seal ring. innovation consists demonstrating that, despite small changes force power rings, minimum values are significant. highlights failure parameters models, leads significant errors simulation results, especially terms continuity contribution mixed friction. simulations also advanced geometric high mesh resolution necessary only assessment during highest pressure increase chamber various conditions. suggest progress engine design performance, confirming importance fluid research.

Language: Английский

---

Performance of a Methanol-Fueled Direct-Injection Compression-Ignition Heavy-Duty Engine under Low-Temperature Combustion Conditions

Energies, Journal Year: 2024, Volume and Issue: 17(17), P. 4307 - 4307

Published: Aug. 28, 2024

Low-temperature combustion (LTC) concepts, such as homogeneous charge compression ignition (HCCI) and partially premixed (PPC), aim to reduce in-cylinder temperatures in internal engines, thereby lowering emissions of nitrogen oxides (NOx) soot. These LTC concepts are particularly attractive for decarbonizing conventional diesel engines using renewable fuels methanol. This paper uses numerical simulations a finite-rate chemistry model investigate the emission processes operating with pure The is gain deeper understanding physical chemical engine identify optimal operation terms efficiency emissions. replicated experimentally observed trends CO, unburned hydrocarbons (UHCs), NOx emissions, required intake temperature achieve consistent phasing at different injection timings, distinctively heat release various timings. It was found that HCCI mode higher than PPC due methanol’s low fuel-richer mixtures. In mode, exhibited ultra-low but UHC along lower compared mode. attributed poor near-wall regions crevices. Low high achievable modes start around crank angle 30° before top dead center. fundamental mechanism behind performance analyzed.

Language: Английский

---

Forecasting Motor Vehicle Ownership and Energy Demand Considering Electric Vehicle Penetration

Energies, Journal Year: 2024, Volume and Issue: 17(20), P. 5094 - 5094

Published: Oct. 14, 2024

Given the increasing environmental concerns and energy consumption, transformation of new vehicle industry is a key link in innovation structure. The shift from traditional fossil fuels to clean encompasses various dimensions such as technological innovation, policy support, infrastructure development, changes consumer preferences. Predicting future ownership electric vehicles (EVs) then estimating demand for transportation pressing issue field energy. This study starts cost, technology, environment, preferences, deeply explores influencing factors on EVs, analyzes mechanisms development establishes predictive model motor considering penetration based system dynamics, simulates annual trends EV conventional (CV) under different scenarios intensity government funding. Using consumption formulas power modes, this quantifies electrification flows fleet structure changes. results indicate that current implementation, domestic EVs CVs projected grow 172.437 million 433.362 million, respectively, by 2035, with proportion per thousand at 28.46% 566,781 J·km−1, respectively. By technical 40% extending preferential policies purchasing vehicles, expected increase 201.276 2035. provides data support formulate promotional can also offer basic charging infrastructure.

Language: Английский

---

Effect of ignition timing and combustion duration on the performance characteristics of a diesel engine using vibe 2-zone model

FME Transaction, Journal Year: 2024, Volume and Issue: 52(4), P. 544 - 555

Published: Jan. 1, 2024

Efficient energy exploitation is a necessary issue because it helps reduce fuel consumption and environmental pollution. Finding the optimal ignition timing (IT) for diesel engines to create high power efficiency deserves attention. This study utilizes AVL BOOST simulation software with Vibe 2-Zone combustion model investigate effect of IT duration on engine characteristics such as power, torque, brake-specific (BSFC) at different loads speeds. Then, prediction models ITs versus durations maximum minimum BSPFC were computed. The results show that strongly affect performance characteristics. produces are unaffected by load. In contrast, they considerably influenced load when considering engine-generated BSFC. correlations linear functions. can be utilized predict timings since experimental time reduced applied actual engine.

Language: Английский

---