Shinichi Goto

Lubricity of Liquefied Gas Assessment of Multi-Pressure/Temperature High-Frequency Reciprocating Rig (MPT-HFRR) -DME Fuel for Diesel

In this study, a MPT-HFRR (Multi-Pressure/Temperature High-Frequency Reciprocating Rig) was manufactured based on a diesel fuel lubricity test apparatus. The MPT-HFRR was designed to be used for conventional test methods as well as for liquefied gas fuel tests. Lubricity tests performed on a calibration standard sample under both atmospheric pressure and high pressure produced essentially constant values, so it was determined that this apparatus could be used for assessing the lubricity of fuel. Using this apparatus, the improvement of lubricity due to the addition of a DME (Dimethyl Ether) fuel additive was investigated. It was found that when 50ppm or more of a fatty acid lubricity improver was added, the wear scar diameter converged to 400μm or less, and a value close to the measured result for Diesel fuel was obtained. The lubricity obtained was considered to be generally satisfactory.

Development of Retrofit DME Diesel Engine Operating with Rotary Distributor Fuel Injection Pump

In order to reduce environmental disruption due to exhaust PM and NOx emissions from diesel engines of dimethyl ether (DME) has been proposed the use for the next generation vehicles, because the discharge of the atmospheric pollutants is less. In this study, DME is used to fuel a retrofit type diesel engine, and operational tests were carried out using a rotary distributor fuel injection pump. In this experiment, comparison and examination of the effects of fuel injection pressure, nozzle hole diameter, and injection timing. When using DME as an alternative fuel, the fuel temperature affects engine operation. And diameter of the injector nozzle hole and larger injection quantity is regarded as factors affecting the improvement in engine performance. In addition, for understanding the DME spray in the cylinder, DME was sprayed in a constant volume chamber where atmospheric temperature and pressure increased simultaneously, and the result is compared and examined with diesel fuel.

Oxidation stability of biodiesel fuel produced from Jatropha Curcas L using Rancimat and PetroOXY method

ABSTRACT In the present work, the oxidation stabilities of oil biodiesel fuel from Jatropha curcas L were investigated by using both Rancimat and PetroOXY test method. Three types of conventional antioxidants, i.e. butylated hydroxytoluene, 6,6-di-tert-butyl-2,2-methylenedi-p-cresol, and commercialized amine, were employed and the oxidation stability effects of those additives were examined. Oxidation stability was influenced differently depending on the type of antioxidants and their concentrations. The obtained experimental data from Rancimat and PetroOXY test methods resulting in a linear correlation at various mixtures shows the potential use of PetroOXY test method for future analytical oxidation stability test. In this research, the changes in the chemical properties of fuel sample, such as: peroxide value, acid value, composition, and kinematic viscosity, obtained from the experimental work were thoroughly discussed.

Planar Laser Rayleigh Scattering for Analyzing Diesel Spray Characteristics

The developing and mixing characteristics of a diesel spray were investigated, and under circumstances of changing fuel injection and the ambient gas conditions. The mixing measurement in the diesel spray was conducted using planar laser Rayleigh scattering. Experiments were conducted in an optically accessible, constant-volume combustion chamber. The chamber could simulate the ambient conditions of a typical diesel engine. In this study n-heptane was injected into the chamber and the scattered light from the spray was detected by an ICCD camera. A 532 nm Nd: YAG laser was used as a light source. The experimental results show that an injection pressure has a great effect on fuel vaporizing and in the mixing. Also, an increase in the injection pressure could promote a much leaner fuellambient gas mix. The results showed that an ambient temperature and density do have a great effect on the vaporization of fuel droplets and a development of liquid length in the diesel spray.

Spectroscopic analysis of combustion flame fueled with dimethyl ether (DME)

To better understand the combustion characteristics of DME, emission intensities of DME combustion radicals from a pre-mixed burner flame were measured by a spectroscope and photomultiplier, Results were compared to other fuels, such as methane and butane. Large peaks in the band spectra from pre-mixed and diffusion DME flames were found near 310 nm, 430 nm, and 515 nm, arising from OH, CH and C 2 , respectively. The DME emission intensities decreased with increasing the equivalence ratio in this study. Notably, the relative decrease in the C 2 band spectra peak was greater than that of the OH band. Comparing the pre-mixed DME and butane flames, the butane band spectra peaks were similar in shape, but much stronger than those for DME. However, it was remarkable that CH and C 2 band spectra peaks decreased only slightly with increase in equivalence ratio compared to the DME case. In case of the butane diffusion flame, there was a continuous spectrum above 430 nm, presumably due to thermal radiation of soot.