Masataka Arai

Bio: Masataka Arai is an academic researcher from Tokyo Denki University. The author has contributed to research in topics: Diesel fuel & Nozzle. The author has an hindex of 15, co-authored 56 publications receiving 1764 citations. Previous affiliations of Masataka Arai include Gunma University.

Development and Use of a Spray Combustion Modeling to Predict Diesel Engine Efficiency and Pollutant Emissions : Part 1 Combustion Modeling

Abstract: A mathematical model of a spray combustion in direct-injection diesel engines has been developed to predict engine performance, thermal efficiency and pollutant emissions. Injected fuel spray was divided into many small packages. Gas and fuel droplet temperatures and evaporated mass of fuel in each package were computed. In considering the complete air-fuel jet mixing process and temperature in each package, the model also enabled subsequent spatial and temporal history of burning rate, local temperature and air-fuel ratio to be calculated.

Disintegrating Process and Spray Characterization of Fuel Jet Injected by a Diesel Nozzle

Abstract: Processus de desintegration et caracteristiques de la pulverisation d'un jet de carburant injecte par une base d'injecteur de moteur diesel

Development and Use of a Spray Combustion Modeling to Predict Diesel Engine Efficiency and Pollutant Emissions : Part 2 Computational Procedure and Parametric Study

Abstract: An algorithm for predicting heat release rate and pollutant emission in direct injection diesel engine has been developed according to the mathematical model mentioned in the first report. Predictions made with the simulation have been compared with the data on a single-cylinder engine over a range of engine speeds, injection timings and swirl ratios. Predicted pressure diagram, and NO and soot emissions showed acceptable quantitative agreement with the data. A parametric study of the effect of variations in load, speed, injection rate, injection timing, swirl ratio and droplet size is then carried out.

Structure of High-Pressure Fuel Sprays

Abstract: A multi-dimensional model was used to calculate interactions between spray drops and gas motions close to the nozzle in dense high-pressure sprays. The model also accounts for the phenomena of drop breakup, drop collision and coalescence, and the effect of drops on the gas turbulence. The calculations used a new method to describe atomization (a boundary condition in current spray codes). The method assumes that atomization and drop breakup are indistinguishable processes within the dense spray near the nozzle exit. Accordingly, atomization is prescribed by injecting drops ('blobs') that have a size equal to the nozzle exit diameter.