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Towards low emissions and high thermal efficiency of gasoline compression ignition engine under high loads by modulating the fuel reactivity and injection strategy

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Science China(Technological Sciences) 2020年第1期63卷 96-104页

作者： JIANG ChenXu LI ZiLong QIAN Yong LU XingCai Key Lab for Power Machinery and Engineering of MOE Shanghai Jiao Tong University

Gasoline compression ignition(GCI) is a practicable way to obtain low emissions and high thermal efficiency of gasoline-like fuels in internal combustion engines. In this paper, the research octane number(RON) and injection strategy were coordinated to optimize the GCI engine performance and emissions under high loads. The direct injection and port injection were used to achieve two injection strategies: direct injection(DI) and port injection plus direct injection(PIDI), and the primary reference fuels(PRF) with the RON of 60, 70, 80 and 90 were used. The results show that using lower RON fuels under high loads, DI mode can achieve higher efficiency, while PIDI mode can achieve lower combustion noise at an expense of slightly lower fuel economy. When the DI mode is converted to PIDI mode with a pre-injection ratio of 30%, using PRF70 under 12 bar and the exhaust gas recirculation(EGR) rate of 40%, the gross indicated thermal efficiency and the maximum pressure rise rate are reduced by 1% and by 2 bar/°CA, respectively, while the particle emissions also decrease significantly, thus achieving low emissions and high efficiency. However, under the same load and EGR rate, DI mode produces less regulated and unregulated emissions than PIDI mode. In addition, the effect of fuel RON was obvious, the lower RON fuels exhibit obvious three-stage heat release in PIDI mode, however, PRF90 with higher RON only exhibits two-stage heat release, and the peak value of the firststage heat release rate is also lower than those of other fuels.

关键词： gasoline compression ignition regulated and unregulated emissions injection strategy particle emissions fuel reactivity

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A methodology for regulating fuel stratification and improving fuel economy of GCI mode via double main-injection strategy

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Frontiers in Energy 2023年第5期17卷 678-691页

作者： Haoqing WU Yaoyuan ZHANG Shijie MI Wenbin ZHAO Zhuoyao HE Yong QIAN Xingcai LU Key Laboratory for Power Machinery and Engineering of the Ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China

Gasoline compression ignition(GCI)combustion faces problems such as high maximum pressure rise rate(MPRR)and combustion deterioration at high *** paper aims to improve the engine performance of the GCI mode by regulating concentration stratification and promoting fuel-gas mixing by utilizing the double main-injection(DMI)*** direct injectors simultaneously injected gasoline with an octane number of 82.7 to investigate the energy ratio between the two main-injection and exhaust gas recirculation(EGR)on combustion and ***-load experiments were conducted using the DMI strategy and compared with the single main-injection(SMI)strategy and conventional diesel *** results indicate that the DMI strategy have a great potential to reduce the MPRR and improve the fuel economy of the GCI *** a 10 bar indicated mean effective pressure,increasing the main-injection-2 ratio(Rm-2)shortens the injection duration and increases the mean mixing *** Rm-2 could moderate the trade-off between the MPRR and the indicated specific fuel consumption with both *** appropriate EGR should be adopted considering combustion and *** DMI strategy achieves a highly efficient and stable combustion at high loads,with an indicated thermal efficiency(ITE)greater than 48%,CO and THC emissions at low levels,and MPRR within a reasonable *** with the SMI strategy,the maximum improvement of the ITE is 1.5%,and the maximum reduction of MPRR is 1.5 bar/°CA.

关键词： gasoline compression ignition injection strategy fuel stratification high efficiency high load

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Distributed Gas Ignition Using injection strategy for High Efficiency and Clean Combustion Under Lean Condition

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Automotive Innovation 2020年第4期3卷 366-373页

作者： Ziqing Zhao Wei Liu Fubai Li Qinhao Fan Zhi Wang State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China

Jet ignition is an efficient way to achieve lean burn of the engine and a promising strategy to meet the stringent emission regulations in the *** paper presents a distributed gas ignition(DGI)combustion concept and realizes a DGI combustion mode using a newly designed DGI *** igniter integrates a fuel injector and a spark plug to achieve minimum volume and easy *** the mixture preparation within the jet chamber is essential for the performance of the igniter,different jet chamber injection strategies were tested with varying excess air-fuel ratio ranging from 1.4 to *** addressing the dual injection strategy,the ignition delay and combustion duration were improved *** with the single injection strategy,dual injection strategy improves the flexibility when preparing the mixture inside the jet chamber and therefore retains more *** increased energy density of the jet chamber helps to generate more energetic jets under dual injection strategy,resulting in the improvement of ignition and combustion performance with lean burn.A higher thermal efficiency and a leaner limit of the engine are attained with dual injection than that with single *** injection exhibits its potential in reducing CO and THC emissions to an acceptable level with leaner *** on dual injection strategy,the maximum indicated thermal efficiency of 45%is achieved.

关键词： Distributed gas ignition Multi-scattering flame injection strategy Thermal efficiency Lean combustion

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Numerical analysis of hydraulic fracture propagation in deep shale reservoir with different injection strategies

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JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 2024年第9期16卷 3558-3574页

作者： Xia, Yingjie Yao, Mingyu Li, Tianjiao Yang, Hai Tang, Chun'an Dalian Univ Technol Sch Civil Engn Dalian 116024 Peoples R China Dalian Univ Technol Deep Underground Engn Res Ctr Dalian 116024 Peoples R China CNPC Chuanqing Drilling Engn Co Ltd Chengdu 610052 Peoples R China

Deep shale reservoirs are characterized by elevated breakdown pressures, diminished fracture complexity, and reduced modified volumes compared to medium and shallow reservoirs. Therefore, it is urgent to investigate particular injection strategies that can optimize breakdown pressure and fracturing efficiency to address the increasing demands for deep shale reservoir stimulation. In this study, the efficiency of various stimulation strategies, including multi-cluster simultaneous fracturing, modified alternating fracturing, alternating shut-in fracturing, and cyclic alternating fracturing, was evaluated. Subsequently, the sensitivity of factors such as the cycle index, shut-in time, cluster spacing, and horizontal permeability was investigated. Additionally, the flow distribution effect within the wellbore was discussed. The results indicate that relative to multi-cluster simultaneous fracturing, modified alternating fracturing exhibits reduced susceptibility to the stress shadow effect, which results in earlier breakdown, extended hydraulic fracture lengths, and more consistent propagation despite an increase in breakdown pressure. The alternating shut-in fracturing benefits the increase of fracture length, which is closely related to the shut-in time. Furthermore, cyclic alternating fracturing markedly lowers breakdown pressure and contributes to uniform fracture propagation, in which the cycle count plays an important role. Modified alternating fracturing demonstrates insensitivity to variations in cluster spacing, whereas horizontal permeability is a critical factor affecting fracture length. The wellbore effect restrains the accumulation of pressure and flow near the perforation, delaying the initiation of hydraulic fractures. The simulation results can provide valuable numerical insights for optimizing injection strategies for deep shale hydraulic fracturing. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by

关键词： Fracture propagation Numerical simulation Hydraulic fracturing Rock failure process analysis (RFPA) injection strategy GEOLOGICAL MEDIA FLUID-FLOW ROCK SIMULATION MODEL DEPTH

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Investigation of flue gas water-alternating gas (flue gas–WAG) injection for enhanced oil recovery and multicomponent flue gas storage in the post-waterflooding reservoir

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Petroleum Science 2021年第3期18卷 870-882页

作者： Zhou-Hua Wang Bo-Wen Sun Ping Guo Shuo-Shi Wang Huang Liu Yong Liu Dai-Yu Zhou Bo Zhou State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500SichuanChina Research Institute of Exploration and Development PetroChina Tarim Oilfeld CompanyKorla 841000XinjiangChina Research Institute of Experiment and Detection PetroChina Xinjiang Oilfeld CompanyKaramay 834000XinjiangChina Xinjiang Laboratory of Petroleum Reserve in Conglomerate Karamay 834000XinjiangChina

Flue gas fooding is one of the important technologies to improve oil recovery and achieve greenhouse gas *** order to study multicomponent fue gas storage capacity and enhanced oil recovery(EOR)performance of fue gas water-alternating gas(fue gas-WAG)injection after continuous waterfooding in an oil reservoir,a long core fooding system was *** experimental results showed that the oil recovery factor of fue gas-WAG fooding was increased by 21.25%after continuous waterfooding and fue gas-WAG fooding could further enhance oil recovery and reduce water cut signifcantly.A novel material balance model based on storage mechanism was developed to estimate the multicomponent fue gas storage capacity and storage capacity of each component of fue gas in reservoir oil,water and as free gas in the post-waterfooding *** ultimate storage ratio of fue gas is 16%in the fue gas-WAG fooding *** calculation results of fue gas storage capacity showed that the injection gas storage capacity mainly consists of N_(2) and CO_(2),only N_(2) exists as free gas phase in cores,and other components of injection gas are dissolved in oil and ***,injection strategies from three perspectives for fue gas storage,EOR,and combination of fue gas storage and EOR were proposed,respectively.

关键词： Flue gas storage Enhanced oil recovery Flue gas water-alternating gas Material balance model injection strategy

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Optimization of Combustion Characteristics and Fuel injection Timing of a New Type Dual-Pit Combustor Rotary Engine

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Energy Engineering 2021年第3期118卷 581-603页

作者： Zhongjia Li Jianfeng Pan Hongjun Liu Baowei Fan Wenming Yang Abiodun Oluwaleke Ojo School of Energy and Power Engineering Jiangsu UniversityZhenjiang212013China Department of Mechanical Engineering National University of Singapore119260Singapore

In order to improve the performance of the rotary engine,this paper has designed a new type of dual-pit rotary engine combustion chamber structure,and compares the combustion and emission characteristics with the rotary engine with a traditional combustion *** existence of the dual-pit combustion chamber strengthens the overall vortex intensity in the cylinder,effectively promotes the mixing process of fuel and air in the cylinder,the maximum combustion pressure in the cylinder increased by 8.6%,significantly increases the diffusion combustion speed,and significantly improves the dynamic performance of the rotary *** this basis,the effects of fuel injection timing parameters on fuel distribution,combustion and emission characteristics were *** distribution is more even and dispersed during injection in the later stage of *** the fuel injection timing was 105°BTDC in the middle of the compression phase,the matching effect of fuel distribution law and ignition scheme was the *** the injection timing was 75°BTDC and 85°BTDC in the late compression stage,the mass fraction of NOx remained at a low *** correlation between soot generation and the change of fuel injection timing was *** the injection time was 85°BTDC,the soot generation remained at a relatively high level.

关键词： Rotary engine combustion chamber structure spray combustion characteristics injection strategy experiment and simulation

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