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نتیجه جستجو - Dimethyl ether

تعداد مقالات یافته شده: 2
ردیف عنوان نوع
1 Second-law analysis of the reforming-controlled compression ignition
تجزیه و تحلیل قانون دوم احتراق فشرده سازی کنترل شده اصلاح-2020
This paper presents the optimization of energy conversion in a novel reforming-controlled compression ignition system, combining the benefits of low-temperature combustion with high-pressure thermochemical recuperation (mostly from the perspective of the second law of thermodynamics). Further, new insights into ways of improving efficiency are provided. A promising renewable fuel dimethyl ether is analyzed for the first time as a primary fuel. A comprehensive analysis of various factors influencing exergy destruction in the reformingcontrolled compression ignition system in their complex interdependence is also performed for the first time. Exergy mapping results show that approximately 33% of the exergy supplied to the system is destroyed owing to irreversible processes in the cylinder itself, and approximately 5% is destroyed in the reforming system (intercooler, vaporizer, and reformer). The reformer is the main source of exergy destruction in the reforming system. Approximately 45% and 38% of the engine exergy destruction is related to chemical reaction and in-cylinderwalls heat interaction, respectively. The results indicate that the efficiency improvement due to second-law optimization reaches up to 7.1%, and if the compression ratio is increased to 18:1 instead of 16:1, this reaches up to 9.2%. The higher improvement is achieved at the highest loads.
Keywords: Homogeneous charge compression ignition | Fuel reactivity control | Thermochemical recuperation | Exergy analysis | Hydrogen | Dimethyl ether
مقاله انگلیسی
2 Study on combustion and emission of a dimethyl ether-diesel dual-fuel premixed charge compression ignition combustion engine with LPG (liquefied petroleum gas) as ignition inhibitor
بررسی احتراق و انتشار یک دی متیل اتر دیزل دوگانه سوز فشرده سازی شارژ پیش آمیخته موتور احتراق جرقه زنی با LPG (گاز مایع) به عنوان مهار کننده سیستم جرقه زنی-2016
A scheme of the DME-diesel dual-fuel PCCI (premixed charge compression ignition) combustion is an attractive option of relatively high thermal efficiency, low emission and operating costs as well as availability of wide DME (dimethyl ether) resource. However, one of the main problems in the DME- diesel dual-fuel PCCI operation is that an early start of combustion easily leads to detonation due to high cetane number and better auto-ignition property of DME, and above-mentioned phenomenon is especially pronounced with a large DME energy ratio or at higher loads. Thus, LPG (liquefied petroleum gas), as a kind of ignition inhibitor, is added into DME for changing the property of port premixed fuel, and the effects of LPG quantity on the combustion and exhaust performance of a DME-diesel dual-fuel PCCI engine is investigated in this paper. Experimental results show that the appearing positions of the maximum cylinder pressure and mass-averaged temperature shift towards later crank angles and their peak values decline slightly when LPG mass fraction in DME/LPG mixture (fL) increases. The start of combustion postpones, and the combustion duration shortens with a rise of fL. Simultaneously, brake thermal efficiency and NOx emission reduce slightly; whereas the number concentration of particles firstly increases but then decreases with a rise of fL.© 2015 Elsevier Ltd. All rights reserved.
Keywords: Dual-fuel | DME-diesel engine | LPG (liquefied petroleum gas) | Combustion | Emission
مقاله انگلیسی
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بازدید امروز: 3905 :::::::: بازدید دیروز: 0 :::::::: بازدید کل: 3905 :::::::: افراد آنلاین: 71