• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Influence of emulsified fuel combustion on soot formation process

Research Project

Project/Area Number 10650906
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 船舶工学
Research InstitutionNiigata Institute of Technology

Principal Investigator

YOSHIMOTO Yasufumi  Niigata Institute of Technology, 工学部, 助教授 (90167023)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
KeywordsDiesel Engine / Model Chamber / Water Addition / Emulsified Fuel / Particulate Matter / Smoke / Nitrogen Oxides / 乳化燃焼 / ディーゼル燃焼 / 燃焼凍結
Research Abstract

It is difficult to achieve simultaneous reductions in soot and nitrogen oxides (Nox) emitted from diesel engines because of the trade-off relation. Water addition is effective to reduce Nox emissions without deterioration in the combustion performance. It is unclear, however, how the water addition influences the soot and particulate emissions. First, experiments were carried out to determine the formation characteristics of smoke emissions using actual diesel engines fueled with water-in-oil emulsified fuels. The experimental parameters with two types of base fuel (gas oil and biodiesel, fuel transesterified from vegetable oil), EGR (exhaust gas recirculation), and water addition were investigated. Compared with water free fuels, the smoke density of the emulsified fuels reduced remarkably at all operating conditions.
To examine the formation process of particulate, experiments using a model chamber were made. It is possible to simulate diesel combustion and a model chamber simulating constant volume combustion was employed. The experimental apparatus consisted of five parts : a modified combustion chamber of the diesel engine, a vessel for high temperature and high pressure air, a rupture system with a needle cutter driven by a solenoid, a vessel to contain expanded gas, and a system for single injections of diesel fuel. A thin steel plate is used to partition the combustion chamber and the gas expansion vessel. In the combustion process the thin plate is ruptured by the needle cutter and the combustion reaction stops immediately, because the burnt gas expands in an extremely short time. The preliminary combustion experiments were conducted at atmospheric conditions with an initial air pressure of 2MPa and 450℃, and the ignition delay was longer than with actual engines. The apparatus will need improvements to obtain more precise data.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi