检索结果-内蒙古大学图书馆

Exploring methanol and CNG as low-reactivity fuels in reactivity controlled compression ignition for single-cylinder diesel engines: An experimental based comparative analysis at full load condition

引用

ENERGY 2025年 324卷

作者： Amrutsagar, Lalitrao Vijay Kumar, Raman Kanabar, Bhavesh Beemkumar, N. Sangwan, Gargi AlHazaa, Abdulaziz Romanovski, Valentin Bhowmik, Abhijit DY Patil Coll Engn Akurdi Dept Mech Engn Pune 411044 India Rayat Bahra Univ Univ Sch Mech Engn Kharar 140103 Punjab India Sohar Univ Fac Engn POB 44 Sohar 311 Oman Marwadi Univ Res Ctr Fac Engn & Technol Dept Mech Engn Rajkot 360003 Gujarat India JAIN Deemed Univ Sch Engn & Technol Dept Mech Engn Bangalore Karnataka India Chitkara Univ Chitkara Ctr Res & Dev Baddi 174103 Himachal Prades India King Saud Univ Coll Sci Dept Phys & Astron Surface & Interface Sci Riyadh 11451 Saudi Arabia Univ Virginia Dept Mat Sci & Engn Charlottesville VA 22904 USA Saveetha Inst Med & Tech Sci SIMATS Dept Addit Mfg Mech Engn Chennai 602105 India Chitkara Univ Inst Engn & Technol Ctr Res Impact & Outcome Rajpura 140401 Punjab India

The present study aimed to assess comprehensively the relative advantages and shortcomings of methanol and CNG in RCCI combustion mode operated on a conventional diesel engine under identical operating conditions. The study has investigated the characteristics of peak pressure, combustion stability, emissions, maximum energy share and overall reactivity of methanol and CNG operation under multiple injection strategy at 5 different energy share levels. It was observed that the deteriorated stability of combustion with increasing participating ratio limits the maximum share of methanol to be 59 %. However, the study indicates that methanol achieves significantly greater NOx reductions, whereas CNG offers improved combustion stability and soot control, underscoring the complementary trade-offs between the methanol and CNG RCCI applications. Compared to CNG counterpart, methanol RCCI operation exhibited 1.6 times lower NOx emissions, while CNG demonstrates 62 % improved combustion stability and 33.33 % reduced soot emissions. The methanol operation further exhibited higher BTE by 3.55 % and 42 % lower CO emissions, whereas CNG operation achieved relatively 57 % lower UHC emissions, identifying the conflicting characteristics of the operations. The study also revealed that advanced injection timing effectively reduces CO, UHC, and soot emissions, whereas retarded injection timing strategy proved to be more effective in lowering NOx emissions.

关键词： Low reactive fuel Combustion stability reactivity controlled compression ignition Premixed combustion Peak pressure

来源：评论

学校读者我要写书评

暂无评论

Optimizing Co-generation performance of reactivity controlled compression ignition engines with solar steam reforming of methanol;a thermoeconomic, economic and exergoenvironmental analysis

引用

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2024年 94卷 145-165页

作者： Asgari, Armin Faal, Mehrdad Yousefi Yari, Mortaza Mohebbi, Milad Mahmoodi, Reza Noorzadeh, Saeed Univ Tabriz Dept Mech Engn Tabriz *** Iran Islamic Azad Univ Fac Mech Engn Tabriz Branch Tabriz Iran

reactivity-controlled compression ignition engines have garnered significant interest for their potential to deliver enhanced performance, particularly in environmental aspects. This study investigates the performance of such engines within a co-generation framework for simultaneous power and cooling production. Low reactivity fuel for the engine is derived from solar steam reforming of methanol, with waste heat recovered through a supercritical CO2 cycle and an absorption refrigeration cycle. The designed configuration undergoes comprehensive analysis encompassing thermodynamic, economic, and exergoenvironmental assessments, including parametric analysis. Optimal engine performance is evaluated through computational fluid dynamics, thermodynamic, and exergoenvironmental analyses across various syngas compositions and reforming conditions. Results indicate that a syngas portion of 60% at a reforming temperature and CH3OH to H2O ratio of 200 degrees C and 1.2 yields optimal engine performance. Besides, the inlet temperature of the CO2 turbine exhibits the greatest impact on co-generation performance. At the optimal state, co-generation's power and cooling load generation reach 467.8 kW and 225 kW, with a unit cost of 53.89 $/GJ, an exergy efficiency of 38.14%, a sustainability index of 1.622, and an exergoenvironmental impact index of 1.607.

关键词： reactivity controlled compression ignition engine Methanol steam reforming Computational fluid dynamics Wasted heat recovery Economic analysis Multi-objective optimization

来源：评论

学校读者我要写书评

暂无评论

Effect of EGR on performance and emissions of a methanol-diesel reactivity controlled compression ignition (RCCI) engine

引用

JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 2023年第9期45卷 1-12页

作者： Huang, Fenlian Li, Lingling Zhou, Meng Wan, Mingding Shen, Lizhong Lei, Jilin Kunming Univ Sci & Technol Yunnan Key Lab Internal Combust Engines Kunming 650500 Yunnan Peoples R China

In the context of global efforts to pursue carbon neutrality, the research on the application of methanol fuel in diesel engines has ushered in a new peak. To identify the combined effects of methanol substitution rate (MSR) and EGR on the combustion process, performance and emission characteristics in methanol-diesel RCCI engines and provide a theoretical basis for the development of methanol engines, the parametric experiments were performed by changing the MSR, EGR rate, and engine load at 1800 rpm. The results showed that methanol-diesel RCCI combustion exhibited relatively longer combustion duration, lower maximum cylinder pressure and PPRR, higher BTE and lower ESFC, significantly higher HC and CO emissions compared to CDC combustion. The maximum in-cylinder pressure and PPRR are found to decrease with the increase in MSR as well as EGR rate. With the MSR increased from 0 to 30% without EGR at 90% load, the BTE increased by 4.02%, the ESFC decreased by 3.29%. At lower engine loads, further increasing MSR resulted in reduction of BTE and increasing ESFC, but the utilization of EGR improved the fuel economy. HC and CO emissions increased with increase in MSR and EGR rate, and decreased with increase in engine load. The soot emission reduced with the increase in MSR, and increased with the increase in EGR rate and engine load. NOx emissions decrease with increase in MSR and EGR rate. At 90% load, with the EGR rate increased from 0 to 20%, the NOx emission at 30% MSR can be reduced by 73.6%. With an increase in MSR, the NO emission decreases dramatically, while the NO2 emission gradually increases, which led to lower total NOx emission and higher NO2/NO rate. Methanol-diesel RCCI mode combustion with the support of EGR has potential to reduce the NOx emissions and improve the fuel economy.

关键词： Methanol Diesel engine reactivity controlled compression ignition EGR Emissions

来源：评论

学校读者我要写书评

暂无评论

Potential of hydrogen/diesel reactivity controlled compression ignition (RCCI) combustion from the perspective of the second law of thermodynamics

引用

INTERNATIONAL JOURNAL OF ENGINE RESEARCH 2022年第5期23卷 907-923页

作者： Jia, Ming Bai, Jinpeng Duan, Huiquan Li, Yaopeng Cai, Yikang Chang, Yachao Dalian Univ Technol Minist Educ Key Lab Ocean Energy Utilizat & Energy Conservat Dalian 116024 Peoples R China

The potential of reactivity controlled compression ignition (RCCI) combustion fueled with hydrogen and diesel (i.e. hydrogen/diesel RCCI) was evaluated using multi-dimensional simulations embedded with a reduced chemical mechanism. In hydrogen/diesel RCCI, the premixed hydrogen is ignited by the diesel, which is directly injected into the cylinder well before the top dead center. To investigate the potential benefits of hydrogen/diesel RCCI, its combustion characteristics were compared with that of gasoline/diesel RCCI from the perspective of the second law of thermodynamics. Meanwhile, the impacts of premixed energy ratio and initial pressure on the exergy distribution for hydrogen/diesel RCCI were explored. The results show that hydrogen/diesel RCCI has an advantage over gasoline/diesel RCCI in the reduction of exergy destruction due to higher combustion temperature, shorter combustion duration, and the distinctive oxidation pathways between hydrogen and gasoline. A higher proportion of exergy output work can be achieved for hydrogen/diesel RCCI under the conditions with the same total input energy and 50% heat release (CA50) point. Moreover, a larger premixed energy ratio (i.e. larger hydrogen proportion) is helpful to elevate exergy output work and reduce exergy destruction owing to higher combustion temperature and the undergoing oxidation pathways of hydrogen with less exergy destruction. A higher initial pressure yields raised exergy destruction because of lower combustion temperature and longer combustion duration, but exergy output work is increased owing to the significantly reduced exergy transfer through heat transfer.

关键词： Hydrogen reactivity controlled compression ignition second law of thermodynamics exergy efficiency exergy destruction

来源：评论

学校读者我要写书评

暂无评论

A Double-Wiebe Function for reactivity controlled compression ignition Combustion Using Reformate Diesel

引用

JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME 2022年第11期144卷 112301页

作者： Yang, Ruinan Ran, Zhongnan Ristow Hadlich, Rodrigo Assanis, Dimitris SUNY Stony Brook Dept Mech Engn Stony Brook NY 11794 USA SUNY Stony Brook Dept Mech Engn Inst Adv Computat Sci Adv Energy Res & Technol Ctr Stony Brook NY 11794 USA

reactivity controlled compression ignition (RCCI) combustion has previously been proposed as a method to achieve high fuel conversion efficiency and reduce engine emissions. A single-fuel RCCI combustion strategy can have decreased fuel system complexity by using a reformate fuel for port fuel injection and the parent fuel (diesel) for direct injection. This paper presents a one-dimensional computational model of a compression ignition engine with single-fuel RCCI. A Wiebe function is used to predict the combustion process by representing the mass fraction burned (MFB) on a crank angle resolved basis. One single-Wiebe function (SWF) and two double-Wiebe functions(DWFs) were fitted to experimentally derive MFB data using the least-square method. The fitted results were compared with MFBs calculated from experimental data to verify the accuracy. The SWF did not fully capture the MFB curve with high fidelity while the detailed DWF captured the MFB curve within a root mean square error of 1.4%. The reduced double-Wiebe function (RDWF) also resulted in a predicted combustion profile with similar accuracy. Hence, the RDWF was used in a GT-power thermodynamic study to understand the effects of the low-temperature heat release (LTHR) fraction and combustion phasing on combustion characteristics. At optimum phasing of 5-10 crank angle degree after the top dead center, increasing the LTHR fraction from 20% to 60% resulted in the fuel conversion efficiency increasing from 39.5% to 41.1%, thus suggesting that the reformate fuel-based RCCI strategy is viable to unlock improved combustion performance.

关键词： energy conversion systems energy systems analysis combustion modeling reformate diesel fuel reactivity controlled compression ignition

来源：评论

学校读者我要写书评

暂无评论

Experimental investigation on the effect of gaseous fuels energy share on reactivity controlled compression ignition mode of combustion operated with gaseous fuels and liquid fuels 3

Experimental investigation on the effect of gaseous fuels en...

引用

3rd International Conference on Smart and Sustainable Developments in Materials, Manufacturing and Energy Engineering (SME)

作者： Harari, P. A. Yaliwal, V. S. Banapurmath, N. R. SDM Coll Engn & Technol Dept Mech Engn Dharwad 580002 Karnataka India KLE Technol Univ BVB Coll Engn & Technol Dept Mech Engn Hubballi 580031 Karnataka India

The effect of gaseous fuels energy share (GFES) on reactivity controlled compression ignition (RCCI) mode of combustion operated with gaseous fuels and liquid fuels have been studied in this research work. Pure diesel, Thevetia Peruviana methyl ester (TPME) B20 and B100 fuels are used as high reactive fuels (HRFs) and these fuels injected directly during compression stroke while compressed natural gas (CNG) and compressed biogas (CBG) fuels are utilized as low reactive fuels (LRFs) and these fuels are injected during suction stroke with the help of electronic control unit (ECU). Experimental tests are carried-out on RCCI engine with 50% of rated power. The CNG and CBG fuels are varied in the form of GFES from 10% to 80%. From test results it is found that, brake thermal efficiency (BTE) of RCCI engine increased up to 40% GFES. The engine-out hydrocarbon (HC) and carbon monoxide (CO) emissions of CBG at all GFES are more as related to CNG. The engine-out nitric oxide (NOx) emissions of RCCI engine fueled with CNG at all GFES are higher as related to CBG. Copyright (c) 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Smart and Sustainable Developments in Materials, Manufacturing and Energy Engineering

关键词： Compressed biogas Compressed natural gas Gaseous fuels energy share reactivity controlled compression ignition

来源：评论

学校读者我要写书评

暂无评论

Experimental investigations of mineral diesel/methanol-fueled reactivity controlled compression ignition engine operated at variable engine loads and premixed ratios

引用

INTERNATIONAL JOURNAL OF ENGINE RESEARCH 2021年第7期22卷 2375-2389页

作者： Singh, Akhilendra Pratap Sharma, Nikhil Kumar, Vikram Agarwal, Avinash Kumar Indian Inst Technol Kanpur Engine Res Lab Dept Mech Engn Kanpur 208016 Uttar Pradesh India

Global warming and stringent emission norms have become the major concerns for the road transport sector globally, which has motivated researchers to explore advanced combustion technologies. reactivity controlled compression ignition combustion technology has shown great potential to resolve these issues and deliver high brake thermal efficiency and emit ultra-low emissions of oxides of nitrogen and particulate simultaneously. In this experimental study, baseline compression ignition combustion mode and reactivity controlled compression ignition combustion mode experiments were performed in a single-cylinder research engine using mineral diesel as high-reactivity fuel and methanol as low-reactivity fuel. All experiments were carried out at constant engine speed at four engine loads (brake mean effective pressure: 1-4 bar). For efficient combustion and lower emissions, four premixed ratios (r(p) = 0, 0.25, 0.50, and 0.75) were tested to assess optimized premixed ratio at different engine loads. In these experiments, primary and secondary fuel injection parameters were maintained identical. Combustion results showed that reactivity controlled compression ignition combustion was more stable compared to compression ignition combustion and resulted in lesser knocking. reactivity controlled compression ignition combustion delivered higher brake thermal efficiency and lower exhaust gas temperature and oxides of nitrogen emissions, especially at maximum engine loads. Addition of methanol as secondary fuel reduced particulate emissions. Particulate analyses depicted that reactivity controlled compression ignition combustion mode emitted significantly lower accumulation mode particles;however, emission of nucleation mode particles was slightly higher. A significant reduction in particulate mass emitted from reactivity controlled compression ignition combustion was another important finding of this study. Particulate number-mass distributions showed that increasing the premix

关键词： reactivity controlled compression ignition methanol combustion particulate matter

来源：评论

学校读者我要写书评

暂无评论

Computational optimization of reactivity controlled compression ignition combustion to achieve high efficiency and clean combustion

引用

INTERNATIONAL JOURNAL OF ENGINE RESEARCH 2021年第7期22卷 2213-2232页

作者： Jain, Avilash Krishnasamy, Anand Pradeep, V Indian Inst Technol Madras Chennai 600036 Tamil Nadu India

One of the major limitations of reactivity controlled compression ignition is higher unburned hydrocarbon and carbon monoxide emissions and lower thermal efficiency at part load operating conditions. In the present study, a combined numerical approach using a commercial three-dimensional computational fluid dynamics code CONVERGE along with artificial neural network and genetic algorithm is presented to address the above limitation. A production light-duty diesel engine is modified to run in reactivity controlled compression ignition by replacing an existing mechanical fuel injection system with a flexible electronic port fuel injection and common rail direct injection systems. The injection schedules of port fuel injection and direct injection injectors are controlled using National Instruments port and direct injection driver modules. Upon validation of combustion and emission parameters, parametric investigations are carried out to establish the effects of direct-injected diesel fuel timing start of injection (SOI), premixed fuel ratio and intake charge temperature on the engine performance and emissions in reactivity controlled compression ignition. The results obtained show that the start of injection timing and intake charge temperature significantly influence combustion phasing, while the premixed fuel ratio controls mixture reactivity and combustion quality. By utilizing the data generated with the validated computational fluid dynamics models, the artificial neural network models are trained to predict the engine exhaust emissions and efficiency. The artificial neural network models for gross indicated efficiency and oxides of nitrogen (NOx) are then coupled with genetic algorithm to maximize gross indicated efficiency while keeping the NO(x)and soot emissions within Euro VI emission limits. By optimizing the start of injection timing, premixed fuel ratio and intake charge temperature simultaneously using the artificial neural network models coupled with ge

关键词： reactivity controlled compression ignition low-temperature combustion computational fluid dynamics genetic algorithm artificial neural network diesel

来源：评论

学校读者我要写书评

暂无评论

reactivity controlled compression ignition and low temperature combustion of Fischer-Tropsch Fuel Blended with n-butanol

引用

RENEWABLE ENERGY 2019年 134卷 1173-1189页

作者： Soloiu, Valentin Gaubert, Remi Moncada, Jose Wiley, Justin Williams, Johnnie Harp, Spencer Ilie, Marcel Molina, Gustavo Mothershed, David Georgia Southern Univ Dept Mech Engn Statesboro GA 30460 USA

LTC was researched by introducing an 80% mass fraction of n-butanol in reactivity controlled compression ignition (RCCI) mode. A 60% mass fraction of n-butanol was port fuel injected (PFI) and the additional 20% was directly injected through a blend of n-butanol (Bu) with Fischer-Tropsch gas to liquid synthetic paraffinic kerosene (GTL) or ULSD as reference. The blended fuels GTL20-Bu80 and ULSD20Bu80 have reduced cetane for improved combustion phasing control compared to the reference RCCI mode with direct injection of neat ULSD and n-Butanol PFI (ULSD40-Bu60). RCCI strategies delayed ignition and increased peak heat release rates due to prolonged mixing time and reactivity stratification, inducing faster flame speeds. In RCCI mode, the ringing intensity (RI) increased up to 85% higher than in CDC. NOx and soot were reduced up to 90% with ULSD40-Bu60 compared to CDC. The butanol blends decreased CO by 25% compared to ULSD RCCI. CO levels overlayed each other for GTL20-Bu80 and ULSD2O-Bu80 across loads, suggesting that the butanol was the influencing factor. ULSD and ULSD20Bu80 RCCI increased mechanical efficiencies compared to CDC by 3-4% across loads. ULSD20-Bu80 had the lowest cetane and displayed the greatest improvement in the overall emissions and efficiencies in RCCI compared to CDC. (C)2018 Elsevier Ltd. All rights reserved.

关键词： reactivity controlled compression ignition n-Butanol Gas to liquid kerosene Low temperature combustion Ringing Emissions

来源：评论

学校读者我要写书评

暂无评论

Experimental studies on performance and emission characteristics of reactivity controlled compression ignition (RCCI) engine operated with gasoline and Thevetia Peruviana biodiesel

引用

RENEWABLE ENERGY 2020年 160卷 865-875页

作者： Harari, P. A. Banapurmath, N. R. Yaliwal, V. S. Khan, T. M. Yunus Soudagar, Manzoore Elahi M. Sajjan, A. M. SDM Coll Engn & Technol Dept Mech Engn Dharwad Karnataka India KLE Technol Univ BVB Coll Engn & Technol Dept Mech Engn Hubballi 580031 Karnataka India King Khalid Univ Coll Engn Dept Mech Engn Abha Saudi Arabia CMR Tech Campus Hyderabad India Univ Malaya Fac Engn Kuala Lumpur 50603 Malaysia KLE Technol Univ Dept Chem Hubballi 580031 Karnataka India

Higher fuel economy associated with lower emissions of diesel engines cannot be achieved with conventional low-pressure injection systems. However high-pressure CRDI facilitated diesel engines with electronic control systems can overcome the twin problems of higher emissions of smoke and nitric oxide with acceptable higher brake thermal efficiency as well. Further use of both high-octane fuels like petrol, ethanol as manifold injected fuels along with high pressure CRDI injected high cetane fuels like diesel, biodiesel can successfully overcome the drawbacks of diesel engine emissions. In this direction a newer concept of RCCI operated modified diesel engine was developed in house and was powered with both high octane and high cetane fuels. Comprehensive experiments were conducted on the RCCI engine to obtain its performance, emission characteristics fueled with selected fuel combinations. From the results for B20 and gasoline operation it was concluded that, injection of 10% gasoline drastically reduces the nitric oxide by 6.67% and soot emission by 4.52% compared to diesel mode. However, there was penalty of high hydrocarbon and carbon monoxide emissions by 12.5% and 7.6% respectively. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： compression ignition engine Dual fuel engine Emissions Performance reactivity controlled compression ignition

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：