ARC Researcher at
ASME 2014 Internal Combustion Engine Division
Fall Technical Conference

October 19-22, 2014, Columbus, IN, USA

Below listed are papers from ARC investigator Prof. Naeim Henein, Wayne State University.

Session: 2-3 Fuel Spray Dynamics I
Tuesday, October 21, 2014 13:30 PM-15:30 PM
ICEF2014-5589: Effects of Cetane Improver on Combustion and Emission Characteristics of Coal-derived Sasol IPK in a Single Cylinder Diesel Engine
Ziliang Zheng, Umashankar Joshi, Naeim Henein (Wayne State University); Eric Sattler (US Army TARDEC)
Abstract: Sasol IPK is a coal-derived synthetic fuel under consideration as an extender to JP-8 used in military ground vehicles. Since Sasol IPK is a low ignition quality fuel with Derived Cetane Number (DCN) of 31, there is a need to improve its ignition quality. This paper investigates the effect of adding different amounts of Lubrizol 8090 cetane improver to Sasol IPK on increasing its DCN. The experimental investigation was conducted in a single-cylinder research type diesel engine. The engine is equipped with a common rail injection system and an open Engine Control Unit (ECU). Experiments covered different injection pressures and intake air temperatures. Analysis of test results was made to determine the effect of cetane improver percentage in the coal-derived Sasol IPK blend on autoignition, combustion and emissions of carbon monoxide (CO), total unburned hydrocarbon (HC), oxides of nitrogen (NOx), and particulate matter (PM). In addition, the effect of cetane improver on the apparent activation energy of the global autoignition reactions was determined.

Session: 2-4 Fuel Spray Dynamics II
Tuesday, October 21, 2014 16:00 PM-17:30 PM
An Investigation on Sensitivity of Ignition Delay and Activation Energy in Diesel Combustion
Umashankar Joshi, Ziliang Zheng, Amit Shrestha, Naeim Henein (Wayne State University); Eric Sattler (US Army TARDEC)
Abstract: The auto-ignition process plays a major role in the combustion, performance, fuel economy and emission in diesel engines. The auto-ignition quality of different fuels has been rated by its cetane number (CN) determined in the CFR engine, according to ASTM D613. More recently, the Ignition Quality Tester (IQT), a constant volume vessel, has been used to determine the derived cetane number (DCN) to avoid the elaborate, time consuming and costly engine tests, according to ASTM D6890. The ignition delay period in these two standard tests and many investigations has been considered to be the time period between start of injection (SOI) and start of combustion (SOC). The ignition delay (ID) values determined in different investigations can vary due to differences in instrumentation and definitions. This paper examines the different definitions and the parameters that effect ID period. In addition the activation energy dependence on the ID definition is investigated. Furthermore, results of an experimental investigation in a single-cylinder research diesel engine will be presented while the charge density is kept constant during the ID period. The global activation energy is determined and its sensitivity to the charge temperature is examined.