Controlling fuel and diluent gas flow for a diesel engine operating in the fuel rich low-temperature-combustion mode

The flow of a diluent gas supplied to a motoring engine was controlled at a diluent to air mass flow ratios of 10%, 30%, 50%, and 70%. This arrangement was a significant set up for running the engine in the Low-Temperature Combustion mode. The engine used was a 436 cc Yanmar Diesel engine, driven at constant 2200 rpm by a 10 hp AC powered dynamometer. Intake air flow was measured by a model FMA-903-V Air Velocity Transducer by Omega Engineering, Inc., and the diluent gas flow was both measured and controlled by a model FMA-2613A Mass Flow Controller, also by Omega Engineering, Inc. Both were connected to a computer through a National Instruments USB-6211 data acquisition hub, and the signals from both were processed in real time through National Instruments' LabView 8.2 software. The diluent gas used was nitrogen. The flow controller was found to have reasonable flow precision but poor flow accuracy at many of the flow rates encountered during this experiment, with a minimum steady state error of 3.7% for a flow rate of 207.4 Standard Liters Per Minute (SLPM), the highest flow studied, and a maximum error of 97.4% at 53.8 SLPM, the lowest flow studied.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2007

Author dc:creator

• Lopez, David M

Advisor dc:contributor.advisor

• Wai K. Cheng.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/40455

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/40455