Experimental Investigation of Combustion and Emission Characteristics for Internal Combustion Rankine Cycle Engine under Different Water Injection Laws

Fu, Lezhong; Wu, Zhijun; Yu, Xiao; Deng, Jun; Hu, Zongjie; Li, Liguang

doi:10.1016/j.egypro.2015.02.047

Cited by 19 publications

(16 citation statements)

References 7 publications

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“…In ICRC engine concept, high-temperature and high-pressure water needs to be injected into the combustion chamber at firing top dead center (TDC), at this crank angle, the ambient pressure within the combustion chamber is significantly higher compared to traditional water injection conditions (during intake stroke or early compression stroke) in a conventional TDGI engine. The literature [50] shows that the maximum in-cylinder pressure of SI-ICRC and CI-ICRC is normally 7 MPa. In this section, the ambient pressure in the long tube is adjusted by continuous injection and modulation of the back-pressure valve.…”

Section: Water Injection Characteristics Under Different Ambient Presmentioning

confidence: 99%

Experimental Research of High-Temperature and High-Pressure Water Jet Characteristics in ICRC Engine Relevant Conditions

et al. 2019

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The internal combustion Rankine cycle (ICRC) concept provides a potential solution for future high thermal efficiency and low emission powertrains, and direct water injection (DWI) proved to be the key parameter for ICRC optimization. This paper was dedicated to investigating the fundamental mechanisms of water spray characteristics under different water injection control parameters. In order to do so, an experimental test system was carefully designed and built based on the Bosch and Schlieren methods: the Bosch method is utilized to measure the effect of injection and ambient pressure on water injection characteristics, and the Schlieren method is utilized to investigate the impact of water injection and ambient temperature on water spray and evaporation processes. The experimental results indicate that both control parameters show important effects on water injection and spray characteristics. The water injection and ambient pressure show significant impacts on steady-state flow quantity and cyclic water injection quantity, and the water injection and ambient pressure affect the evaporation ability of water vapor within the spray which leads to a different variation trend during the initial, developing, and developed water spray stages. The results of this work can be used as fundamental supplements for ICRC, steam assistant technology (SAT), and DWI-related ICEs experimental and numerical researches, and provide extra information to understand the DWI process within engine-relevant conditions.

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Section: Water Injection Characteristics Under Different Ambient Presmentioning

confidence: 99%

Experimental Research of High-Temperature and High-Pressure Water Jet Characteristics in ICRC Engine Relevant Conditions

et al. 2019

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“…optimized engine load) lead to faster in-cylinder water evaporation, which provide larger increment in cycle efficiency optimization [21]. Although the DWI show huge potential in reducing abnormal combustion, the elimination of abnormal combustion is still a huge problem, therefore, within SI ICRC engine, large portion of exhaust gas recirculation (EGR) is needed for lowering in-cylinder temperature [22], the utilization of EGR limited the potential of ICRC concept as it shows negative impact on cycle efficiency optimization. In order to solve this problem, the compression ignition (CI) combustion mode is tested within the second generation of ICRC prototype engine, by utilization of homogeneous and heterogeneous charge compression ignition, a significant reduction of EGR utilization is realized, intake OF under homogeneous charge compression ignition (HCCI) varies from 70% to 100% [23], while OF decreased to 65% to 75% under traditional diffusion flame CI [24].…”

Section: Introductionmentioning

confidence: 99%

Chemical kinetic analysis of in-cylinder ion current generation under direct water injection within internal combustion Rankine cycle engine

et al. 2022

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Direct water injection provides feasible solution for combustion optimization and efficiency enhancement within internal combustion Rankine cycle engine, while the feedback signal of close-loop direct water injection control is still absent. Ion current detection monitors in-cylinder electron variation which shows potential in revealing direct water injection process. For better understanding of unprecedented augment of ion current signal under direct water injection within internal combustion Rankine cycle engine, a chemical kinetic model is established to calculate the effect of intake oxygen fraction, fuel quantity, initial temperature and residual water vapor on in-cylinder electron formation based on GRI Mech 3.0 and ion current skeleton mechanism. The simulation results indicate direct water injection process show significant impact on in-cylinder electron formation through chemical interactions between H2O and other intermedia species including HO2, O2, CH3 and H, these reactions provides additional OH radical for propane oxidation facilitation, which result in large portion of CH radical formation and therefore, lead to higher in-cylinder electron generation. The initial temperature plays a vital role in determining whether residual water vapor show positive or negative effect by in-cylinder temperature coordination of direct water injection. Results of this work can be used to explain phenomenon related to direct water injection and ion current signal variation under both internal combustion Rankine cycle or traditional petrol engine.

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“…This concept of preheating the injected water by recovering some of the waste heat in oxy-fuel internal combustion engines is known as internal combustion Rankine cycle (ICRC). Better emissions of the ICRC engines have been also reported beside their improved efficiency [19]. It has been shown that the economic feasibility of the ICRC concept for automobiles could be superior to those based on fuel cells and biofuels [14].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Performance and Emissions of HCCI Oxy-Fuel Combustion in a CFR Engine with Recirculated Carbon Dioxide

Mohammed

Elkhazraji

Jan

et al. 2020

SAE Technical Paper Series

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Stringent emission regulations and the anticipated climate change call for a paradigm shift in the design of the conventional internal combustion engines. One way to combat this problem is oxy-fuel combustion in which the combustion products are mainly water vapor and carbon dioxide. Water vapor can be easily separated by condensation and carbon dioxide is then easily captured and stored. However, many technical challenges are associated with this mode of combustion. There are many challenges facing oxy-fuel combustion before it find its way to commercial production especially for internal combustion engines. One such challenge is the relatively high temperature of the oxy-fuel combustion. A solution to this problem is the recirculation of the generated CO2 to moderate the in-cylinder temperature. Therefore, careful study of the effect of recirculating the CO2 back to combustion chamber is needed before the implementation of such a concept. This study is a continuation of a previous work published by the authors. In the previous study, the performance and emissions of an oxy-fuel HCCI engine were investigated. The in-cylinder temperature was moderated by supplying the engine with fresh CO2 from gas cylinders. In this present work the performance of the same oxy-fuel HCCI engine is investigated but the difference is that the in-cylinder temperature is regulated by recirculating the generated CO2. The experiments were conducted in a variable compression CFR engine that was modified to operate in oxy-fuel mode with recycled carbon dioxide. The emissions were also measured using an FTIR exhaust analyzer. The results showed that the implementation of this concept is possible. However, the indicated thermal efficiency deteriorates due to lower combustion and gas exchange efficiencies. Also, the CO2 recirculation resulted in higher CO and unburned hydrocarbon (UHC) emissions.

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Experimental Investigation of Combustion and Emission Characteristics for Internal Combustion Rankine Cycle Engine under Different Water Injection Laws

Cited by 19 publications

References 7 publications

Experimental Research of High-Temperature and High-Pressure Water Jet Characteristics in ICRC Engine Relevant Conditions

Experimental Research of High-Temperature and High-Pressure Water Jet Characteristics in ICRC Engine Relevant Conditions

Chemical kinetic analysis of in-cylinder ion current generation under direct water injection within internal combustion Rankine cycle engine

A Study on the Performance and Emissions of HCCI Oxy-Fuel Combustion in a CFR Engine with Recirculated Carbon Dioxide

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