Localized ignition delay prediction from temperature measurements of n-heptane in the combustion chamber of the ignition quality tester

Fuel ◽  
2021 ◽  
pp. 122828
Author(s):  
Osama Hmood ◽  
Edgar Matida
Keyword(s):  
Combustion Chamber ◽  
Ignition Delay ◽  
Temperature Measurements ◽  
Ignition Quality ◽  
Ignition Quality Tester ◽  
Delay Prediction

A Proposed Biodiesel Combustion Kinetics Based on the Computational Fluid Dynamics Results in an Ignition Quality Tester

2019 ◽  
Vol 141 (8) ◽  
Author(s):  
Mahmoud Elhalwagy ◽  
Chao Zhang
Keyword(s):  
Methyl Ester ◽  
Ignition Delay ◽  
Methyl Esters ◽  
Direct Injection ◽  
Combustion Process ◽  
Major Fatty Acid ◽  
Combustion Behavior ◽  
Ignition Quality ◽  
Reaction Constants ◽  
Ignition Quality Tester

In this paper, five biodiesel global combustion decomposition steps are added to a surrogate mechanism to accurately represent the chemical kinetics of the decomposition of different levels of saturation of biodiesel, which are represented by five major fatty acid methyl esters. The reaction constants were tuned based on the results from the numerical simulations of the combustion process in an ignition quality tester (IQT) in order to obtain accurate cetane numbers. The prediction of the complete thermophysical properties of the five constituents is also carried out to accurately represent the physics of the spray and vaporization processes. The results indicated that the combustion behavior is controlled more by the spray and breakup processes for saturated biodiesel constituents than by the chemical delay, which is similar to the diesel fuel combustion behavior. The chemical delay and low temperature reactions were observed to have greater effects on the combustion and ignition delay for the cases of the unsaturated biodiesels. The comparison between the physical ignition delay and overall ignition delay between the saturated and unsaturated biodiesel constituents has also confirmed those stronger effects for the physical delay in the saturated compounds as compared to the unsaturated compounds. The validation of the proposed model is conducted for the simulations of two direct injection diesel engines using palm methyl ester and rape methyl ester.

Formulation of Sasol Isomerized Paraffinic Kerosene Surrogate Fuel for Diesel Engine Application Using an Ignition Quality Tester

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Ziliang Zheng ◽  
Tamer Badawy ◽  
Naeim Henein ◽  
Peter Schihl ◽  
Eric Sattler
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Alternative Fuels ◽  
Internal Combustion Engines ◽  
Cetane Number ◽  
Surrogate Fuels ◽  
Cycle Simulation ◽  
Ignition Quality ◽  
Surrogate Fuel ◽  
Ignition Quality Tester

Sasol isomerized paraffinic kerosene (IPK) is a coal-derived synthetic fuel under consideration as a blending stock with jet propellant 8 (JP-8) for use in military equipment. However, Sasol IPK is a low ignition quality fuel with derived cetane number (DCN) of 31. The proper use of such alternative fuels in internal combustion engines (ICEs) requires the modification in control strategies to operate engines efficiently. With computational cycle simulation coupled with surrogate fuel mechanism, the engine development process is proved to be very effective. Therefore, a methodology to formulate Sasol IPK surrogate fuels for diesel engine application using ignition quality tester (IQT) is developed. An in-house developed matlab code is used to formulate the appropriate mixture blends, also known as surrogate fuel. And aspen hysys is used to emulate the distillation curve of the surrogate fuels. The properties of the surrogate fuels are compared to those of the target Sasol IPK fuel. The DCNs of surrogate fuels are measured in the IQT and compared with the target Sasol IPK fuel at the standard condition. Furthermore, the ignition delay, combustion gas pressure, and rate of heat release (RHR) of Sasol IPK and its formulated surrogate fuels are analyzed and compared at five different charge temperatures. In addition, the apparent activation energies derived from chemical ignition delay of the surrogate fuel and Sasol IPK are determined and compared.

An Investigation on Sensitivity of Ignition Delay and Activation Energy in Diesel Combustion

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Umashankar Joshi ◽  
Ziliang Zheng ◽  
Amit Shrestha ◽  
Naeim Henein ◽  
Eric Sattler
Keyword(s):  
Activation Energy ◽  
Ignition Delay ◽  
Cetane Number ◽  
Ignition Process ◽  
Start Of Injection ◽  
Auto Ignition ◽  
Time Period ◽  
Ignition Quality ◽  
Ignition Quality Tester ◽  
Start Of Combustion

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 cooperative fuel research 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 (ID) 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 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.

An Investigation on Sensitivity of Ignition Delay and Activation Energy in Diesel Combustion

2014 ◽  
Author(s):  
Umashankar Joshi ◽  
Ziliang Zheng ◽  
Amit Shrestha ◽  
Naeim Henein ◽  
Eric Sattler
Keyword(s):  
Activation Energy ◽  
Ignition Delay ◽  
Cetane Number ◽  
Ignition Process ◽  
Start Of Injection ◽  
Auto Ignition ◽  
Time Period ◽  
Ignition Quality ◽  
Ignition Quality Tester ◽  
Start Of Combustion

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.

Formulation of Sasol IPK Surrogate Fuel for Diesel Engine Application Using an Ignition Quality Tester (IQT)

2016 ◽  
Author(s):  
Ziliang Zheng ◽  
Tamer Badawy ◽  
Naeim Henein ◽  
Peter Schihl ◽  
Eric Sattler
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Cetane Number ◽  
Combustion Gas ◽  
Surrogate Fuels ◽  
Aspen Hysys ◽  
Ignition Quality ◽  
Apparent Activation Energies ◽  
Surrogate Fuel ◽  
Ignition Quality Tester

This paper presents an approach to develop Sasol IPK (Iso-Paraffinic Kerosene) surrogate fuels for diesel engine application using Ignition Quality Tester (IQT). The methodology includes: 1) in-house developed MATLAB code to formulate the appropriate mixture blends, 2) Aspen HYSYS to develop the distillation curve and compares it to the target Sasol IPK fuel, 3) IQT to measure the derived cetane number (DCN) of surrogate fuels and compare it with the target Sasol IPK fuel, 4) analysis of autoignition and combustion characteristics for Sasol IPK surrogate fuels. The ignition delay, combustion gas pressure, and rate of heat release of Sasol IPK and its formulated surrogate fuel are analyzed and compared at five different charge temperatures. Furthermore, the apparent activation energies derived from chemical ignition delay of the surrogate fuel and Sasol IPK are determined and compared.

Relating the octane numbers of fuels to ignition delay times measured in an ignition quality tester (IQT)

Fuel ◽  
2017 ◽  
Vol 187 ◽  
pp. 117-127 ◽  
Author(s):  
Nimal Naser ◽  
Seung Yeon Yang ◽  
Gautam Kalghatgi ◽  
Suk Ho Chung
Keyword(s):  
Ignition Delay ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Ignition Quality ◽  
Ignition Quality Tester
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