Thermal efficiency–related parameters in semi-premixed diesel combustion with a twin peak shaped heat release were experimentally investigated 0.55-L single-cylinder engine. Here, the first is realized premixed at top dead center after end of fuel injection sufficient ignition delay. The quantity for was maximized range to limit rate pressure rise below 0.6 MPa/°CA 0.4 MPa IMEP, 0.8 and 1.0 1.3 IMEP ensure large degree constant volume suppress smoke emissions. second formed from...

The effects of fuel properties including ignitability, volatility, and compositions on operational range combustion characteristics premixed diesel with various high volatility model fuels an ordinary were examined in a direct injection engine. indicated mean effective pressure was limited by knocking high-intake oxygen concentrations unstable or significant increases CO total hydrocarbon emissions low-intake regardless fuels. has little effect the stable combustion. With increasing octane...

Improvements of the thermal efficiency in twin shaped semi-premixed diesel combustion mode with premixed primary stage and spray diffusive secondary multi-stage fuel injection were investigated experiments 3D-CFD analysis. For a better understanding advantages this mode, results compared conventional modes, mainly consisting combustion. The has higher than at both low medium load conditions examined here. heat release is more concentrated top dead center, resulting significant reduction...

To simultaneously establish the high thermal efficiencies and low smoke emissions in semi-premixed diesel combustion with a twin peaked heat release consisting of first-stage premixed second-stage spray diffusive combustion, combination dual-injectors newly designed divided chamber was proposed characteristics were investigated. The lip at middle side wall can prevent second fuel from entering burned region premixture injection, realizing suitable spatial distribution flames suppressing soot...

As fuel volatility and ignitability have strong influences on mixture formation combustion, expansion of operation limit premixed diesel combustion can be expected with optimizing properties. In this study, JIS #2 three primary reference fuels (PRF) octane number from 0 to 40 were used investigate the effects combustion. With similar but different volatility, normal heptane show limit, indicating little effect volatility. increasing in 40, phasing is retarded, higher intake oxygen...

<div class="section abstract"><div class="htmlview paragraph">The authors have reported significant smoke reduction in twin shaped semi-premixed diesel combustion with a newly designed chamber to distribute the first and second sprays into upper lower layers. However, stage premixed tends advance far from TDC, resulting lowering of thermal efficiencies. In this report, improvement efficiency by optimizing phase ignitability fuels was identified divided chamber. The experiment...

The effects of fuel properties including ignitability, volatility, and compositions on operational range combustion characteristics premixed diesel with various high volatility model fuels an ordinary were examined in a DI engine. IMEP was limited by knocking intake oxygen concentrations unstable or significant increases CO THC emissions low regardless fuels. has little effect the stable combustion. With increasing octane number phasing is retarded higher can be employed within tolerance...

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 100 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”

In recent years, the quality of marine bunker fuel oil has been deteriorating and is anticipated to be poorer in future.Although it anxious that there must happened many considerable problems caused by degraded fuels, more advanced technology design materials, including engine oil, on diesel expected solve such problems.This paper describes influence deterioration against lubrication, various charts graphs show effects TBN additive arrangement oils piston deposit wear reduction.For this...

It is important to develop a method evaluate both the cylinder oil distribution and its deterioration on liner surfaces for two-stroke marine diesel engines. This paper describes newly developed sampling wall evaluation under engine operating conditions.(1) By periodically opening closing lube valve via control device in synchronization with crank angle, system capable of automatically timely manner.(2) Lube pH readings given by through analysis functions during operation, are fairly good...

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 100 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”