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Research on the Effect of CO2 Addition in Intake Air on Combustion and Unregulated Exhaust Emissions of CI Engine Operated with Dimethyl Ether

Author: ZhouShaoRen
Tutor: ZhangZuoSheng
School: Huazhong University of Science and Technology
Course: Power Machinery and Engineering
Keywords: Dimethyl ether engine Blended CO2 intake Combustion Unregulated emissions Zero-dimensional simulation The quasi Victoria region model
CLC: TK401
Type: Master's thesis
Year: 2007
Downloads: 82
Quote: 1
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Abstract


Facing the dual challenges of energy crisis and environmental pollution, the internal combustion engine efficient and clean combustion in the countries internal combustion engine sector has caused widespread concern. Dimethyl ether (DME) is clean and efficient vehicle engine fuel, at home and abroad in recent years launched a dimethyl ether combustion performance and emissions of a large number of experimental and simulation studies because of its outstanding physical and chemical characteristics and ultra-low emissions. Firstly a brief introduction on the development of the internal combustion engine of alternative fuels as well as the physical and chemical characteristics of dimethyl ether engine, EGR technology development. Emissions of DME engine combustion unconventional and variable parameter test study, to get a limit unregulated emissions test conditions and engine operating parameters. Explore the the unregulated emissions reaction mechanism and unregulated emissions with conventional emissions (formaldehyde and HC emissions, the relationship between the formic acid and NO emissions). Intake blended CO 2 DME engine test bench, to design the intake system of the bench, calibration Swiss production of high-precision Kistler piezoelectric sensor with ancillary charge amplifier set of Fourier transform infrared analyzer measurement unregulated emissions CALCMET detection library. Combustion performance and emissions test, measuring the the CO 2 Add DME engine cylinder pressure, pressure rise rate and pressure rise acceleration, fuel consumption rate, exhaust gas temperature, noise, excessive conventional air ratio, exhaust emissions CO, CO 2 the O 2 , HC and NOx, as well as the concentration of unregulated emissions of formaldehyde, formic acid and methyl formate . Provide a large number of experimental data for further in-depth theoretical calculation. Watson zero-dimensional model the entered gas adding CO 2 Numerical Simulation of DME engine combustion characteristic parameters (such as cylinder temperature, specific heat ratio) and performance parameters (such as cylinder pressure) and experimental verification, confirmed watson model and its calculation of the effectiveness of the program. At the same time. Measured engine indicator diagram, DME engine combustion heat release rate calculated with the parameters analyzed. Watson zero-dimensional model based on the quasi-Victoria-area model of DME engine NOx emissions numerical simulation, discussed with CO 2 blending amount of change and change the law, and by trial data to verify the applicability of the model and the good predictive ability.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > General issues > Theory
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