Simulation Research of the Effect of Compression Ratios on Combustion and Emission for Methanol/Diesel Dual Fuel Engine

2014 ◽  
Vol 709 ◽  
pp. 78-82
Author(s):  
Xu Dong Zhang ◽  
Yin Nan Yuan ◽  
Jia Yi Du
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Pressure Rise ◽  
Delay Period ◽  
Dual Fuel ◽  
Ignition Timing ◽  
Simulation Research ◽  
Rise Rate ◽  
Crank Angle ◽  
Ignition Delay Period

This paper has studied the influence of the different ratio on combustion process and emissions of air premixed methanol/diesel dual fuel engine. The research was based on 4B26 diesel engine, and the 3-D numerical simulation on combustion process and emissions of the diesel engine with intake premixed methanol was carried out using AVL FIRE software. The study showed that,with the compression ratio reducing,the ignition delay period prolonged, and the ignition timing delayed, the maximum firing pressure, the peak of pressure rise rate and the maximum combustion temperature in cylinder decreased, the crank angle postponed, the NOX emission decreased and the Soot emission increased obviously.

Experimental Investigation of Combustion Characteristics of a Single Cylinder Diesel Engine at Altitude

2021 ◽  
pp. 1-21
Author(s):  
Zhentao Liu ◽  
Jinlong Liu
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Pressure Rise ◽  
Combustion Characteristics ◽  
Atmospheric Conditions ◽  
Single Cylinder ◽  
Combustion Duration ◽  
Rise Rate ◽  
Heavy Duty Diesel ◽  
Intake Pressure

Abstract Concern over the change of atmospheric conditions at high altitudes prompted interests in the deteriorated efficiency and emissions from heavy-duty diesel engines. This study utilized a single-cylinder, four stroke, direct injected diesel engine to experimentally investigate the altitude effects on combustion characteristics. High altitude operations were simulated via reducing the intake pressure but maintaining constant engine speed and torque. The results suggested reduced in-cylinder pressure but increased temperature as altitude rose. The combustion analysis indicated a slight longer ignition delay, raising and retarding the pressure rise rate and energy release rate in the premixed combustion process. A smaller excess air ratio contributed to combustion deterioration, reflected from a retarded end of combustion, a longer combustion duration, a reduced thermal efficiency, and an increased level of incomplete combustion. However, the phasing and combustion profile were not significantly impacted, when the altitude was elevated from sea level to 2000m, at least for the engine and conditions investigated in this study. Consequently, it is not necessary to adjust the engine ECU when operated in the U.S., considering that the mean elevations of most states are lower than 2000m.

Simulation Research on Post-Injection of Electronically Controlled Heavy-Duty Diesel Engine

2011 ◽  
Vol 121-126 ◽  
pp. 2238-2242
Author(s):  
Ming Hai Li ◽  
Feng Jiang ◽  
Biao Liu ◽  
Ming Gao Ouyang
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Process ◽  
Pressure Rise ◽  
Injection System ◽  
Post Injection ◽  
Simulation Research ◽  
Di Diesel Engine ◽  
Heavy Duty Diesel

GT-Suite software is used to establish the simulation model of electronic fuel injection system for 16V280ZJ diesel engine. Combustion process simulation calculation is conducted to the direct injection (DI) diesel engine based on a main-post double injection scheme. Simulation parameters are modified based on the comparison with given experimental results. The calculation results effectively reflect the influence of fuel ratio and the interval angle between main and post injection over emission and fuel economy. Finally, in order to improve the engine emissions and reduce the pressure rise rate, we get the optimal injection solution for the main-post injection mode.

The Study on Combustion Mechanism of Methanol and Diesel Micro-Emulsion in Engine

2012 ◽  
Vol 424-425 ◽  
pp. 1237-1243
Author(s):  
Qing Hui Zhou ◽  
Qing Bo Li ◽  
Wei Ji
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Chemical Kinetic ◽  
Delay Period ◽  
Combustion Mechanism ◽  
Cylinder Pressure ◽  
Combustion Duration ◽  
Micro Emulsion ◽  
Process Product ◽  
Ignition Delay Period

Based on S195 diesel engine, the cylinder pressure of different methanol and diesel micro-emulsion were mea sured, and Chemical Kinetic was analyzed. The result showed that the max combustion pressure was added and the heat release was reduced by the methanol increase. The reason was that the different methanol content could effect the combustion process product such as CH2O，H2O2，O，OH，H, and effect ignition delay period and combustion duration period, and accordingly effect power and emission.

Influence of Micro-Emulsified Biodiesel on Combustion and Emission Characteristics of a Turbocharged Diesel Engine

2012 ◽  
Vol 608-609 ◽  
pp. 269-274
Author(s):  
Qi Min Wu ◽  
Ping Sun ◽  
De Qing Mei ◽  
Zhen Chen
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Pressure Rise ◽  
Operating Conditions ◽  
Maximum Pressure ◽  
Emission Characteristics ◽  
Combustion Duration ◽  
Rise Rate ◽  
Di Diesel Engine ◽  
Emulsified Biodiesel

In this paper, two kinds of micro-emulsified biodiesel containing 5.6% and10% water are prepared. The effects of micro-emulsified biodiesel on engine’s power, combustion and emission characteristics are investigated in a DI diesel engine. The results show that under the rated speed and full load operating conditions, the maximum pressure rise rate and peak heat release rate for micro-emulsified biodiesel increase dramatically, while the ignition delay is prolonged and the combustion duration becomes shorter. Compared to base diesel, the HC, CO and smoke emissions from the engine fueled with biodiesel decrease sharply, except for a 9% increased NOx at large loads. However, micro-biodiesel could significantly reduce the NOx and smoke emissions, except for the higher HC and CO emissions at low and medium loads. When fuelled with 10%MB, the NOx and smoke emissions are 9% and 90% lower than that of diesel, respectively. Results reported here suggest that the application of micro-emulsified biodiesel in diesel engines has a potential to improve combustion process and reduce NOx, PM emissions simultaneously.

Accelerometer Signal to Characterize the Combustion Development in Multiple Injection Diesel Engine

2012 ◽  
Author(s):  
G. Chiatti ◽  
O. Chiavola ◽  
E. Recco
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Pressure Rise ◽  
Vibration Signal ◽  
Injection System ◽  
Cylinder Pressure ◽  
Multiple Injection ◽  
Real Time Control ◽  
Common Rail Injection System ◽  
Crank Angle

This work constitutes one of the last steps of a comprehensive research program in which vibration sensors are used with the purpose of developing and setting up a methodology that is able to perform a real time control of the combustion process by means of non-intrusive measurements. Previous obtained and published results have demonstrated that a direct relationship exists between in-cylinder pressure and engine block vibration signals. The analysis of the processed data have highlighted that the block vibration signal may be used to locate, in the crank–angle domain, the combustion phases (the start of the combustion, the crank angle value corresponding to the beginning of main combustion and to the in-cylinder pressure maximum value) and to quantify the in-cylinder pressure development by evaluating the pressure peak value and the pressure rise rate caused by the combustion process. The aim of this work is to extend and validate the developed methodology when a multiple-injection strategy is imposed on the engine. The paper presents the results obtained during the experimentation of a two cylinder diesel engine equipped with a common rail injection system, that was performed in the Laboratory of the Mechanical and Industrial Department of ‘ROMA TRE’ University. During the tests, a wide variation of the injection parameters settings is imposed on the engine (timing and duration) in its complete operative field.

Effect of Dual Fuel Engine Parameters and Fuel Type on Engine Noise Emissions

2010 ◽  
Author(s):  
Emad Elnajjar ◽  
Mohamed Y. E. Selim ◽  
Farag Omar
Keyword(s):  
Compression Ratio ◽  
Engine Speed ◽  
Pressure Rise ◽  
Dual Fuel ◽  
Operating Parameters ◽  
Injection Timing ◽  
Cylinder Pressure ◽  
Fuel Type ◽  
Rise Rate ◽  
Crank Angle

Investigating experimentally the effects of different fuel types and engine parameters on the overall generated engine noise levels. Engine parameters such as: Engine speed, Injection timing angle, engine loading, different pilot fuel to gases fuel ratio and engine compression ratio. Engine noises due to combustion, turbulent flow and motoring were reported in this study by direct sound pressure level SPL (dB) measurements and compared to the maximum cylinder pressure rise rate with respect to the engine crank angle (dP/dθ)max. Experimental procedures conducted using a Ricardo diesel version variable compression research engine. The study was conducted for three different fuels: single diesel fuel, and dual fuel engine that uses LPG or natural gas. The study for each fuel type covered the following operating parameters range, engine speed from 20–28 rev/sec, injection timing form 20 to 45° BTDC, compression ratio from 16 to 22, load range 2 to 14 N.m, and ratio of pilot to gaseous fuel from 0 to 10%. The study reported the location (crank angle) corresponding to maximum cylinder pressure and max pressure rise rate. Results from testing dual fuel engine with varying design and operating parameters are presented and discussed. The present work reported higher SPL (dB) generated from burning a dual fuel compared to burning diesel fuel only.

scholarly journals An Examination of the Ignition Delay Period in Gas-Fueled Diesel Engines

1998 ◽  
Vol 120 (1) ◽  
pp. 225-231 ◽  
Author(s):  
Z. Liu ◽  
G. A. Karim
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Chemical Processes ◽  
Delay Period ◽  
Dual Fuel ◽  
Gaseous Fuels ◽  
Gas Fueled ◽  
Fuel Mixtures ◽  
Physical And Chemical ◽  
Ignition Delay Period

Changes in the physical and chemical processes during the ignition delay period of a gas-fueled diesel engine (dual-fuel engine) due to the increased admission of the gaseous fuels and diluents are examined. The extension to the chemical aspects of the ignition delay with the added gaseous fuels and the diluents into the cylinder charge is evaluated using detailed reaction kinetics for the oxidation of dual-fuel mixtures at an adiabatic constant volume process while employing n-heptane as a representative of the main components of the diesel fuel. In the examination of the physical aspects of the delay period, the relative contributions of changes in charge temperature, pressure, physical properties, pre-ignition energy release, heat transfer, and the residual gas effects due to the admission of the gaseous fuels are discussed and evaluated. It is shown that the introduction of gaseous fuels and diluents into the diesel engine can substantially affect both the physical and chemical processes within the ignition delay period. The major extension of the delay is due to the chemical factors, which strongly depend on the type of gaseous fuel used and its concentration in the cylinder charge.

scholarly journals Effects of Ignition Timing on Combustion Characteristics of a Gasoline Direct Injection Engine with Added Compressed Natural Gas under Partial Load Conditions

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 755
Author(s):  
Peng Zhang ◽  
Jimin Ni ◽  
Xiuyong Shi ◽  
Sheng Yin ◽  
Dezheng Zhang
Keyword(s):  
Natural Gas ◽  
Direct Injection ◽  
Pressure Rise ◽  
Combustion Characteristics ◽  
Gasoline Direct Injection ◽  
Dual Fuel ◽  
Ignition Timing ◽  
Combustion Duration ◽  
Rise Rate ◽  
Dual Fuel Combustion

The gasoline/natural gas dual-fuel combustion mode has been found to have unique advantages in combustion. The ignition timing has a significant impact on the combustion characteristics of gasoline engines. Thus, here we study the combustion characteristics of gasoline/natural gas dual-fuel combustion mode to determine the details of their respective advantages under cooperative combustion. A direct-injection turbocharged gasoline engine was modified, and an engine experimental platform was built for the coordinated control of gasoline direct-injection and natural gas port injection. A low-speed and low-load operating point was selected, and the in-cylinder pressure, heat release rate, pressure rise rate, combustion temperature, ignition delay, and combustion duration under the coordinated combustion of gasoline and natural gas dual fuel at the ignition moment were studied through bench tests among other typical combustion parameters. The results show that with the increase of the ignition advance angle, the maximum cylinder pressure, heat release rate, pressure rise rate, and maximum combustion temperature increase. The ignition advance angle is 28°CA-BTDC, and PES40 has the best fuel synergy effect and the best power performance improvement. The effect of the advance of the ignition advance angle on the ignition delay and the combustion duration reaches the peak at 20°CA-BTDC–22°CA-BTDC, and the improvement of the two periods is more significant at PES60.

Sign in / Sign up

Export Citation Format

Share Document