A comparative study of mixture formation and combustion processes in a gasoline Wankel rotary engine with hydrogen port and direct injection enrichment

Yang, Jinxin; Ji, Changwei; Wang, Shuofeng; Wei, Du; Ma, Zedong; Ma, Lili

doi:10.1016/j.enconman.2018.04.105

Cited by 52 publications

(10 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To more accurately investigate how hydrogen addition accelerates the combustion process and promotes the chemical reaction rate, the distributions and trends of reaction radicals OH, O, H, H 2 O 2 , and HO 2 , which represent important intermediate products of the combustion reaction are displayed in Table . As shown in Table , the OH, O, and H radicals distribute in the burned zone while the H 2 O 2 and HO 2 radicals distribute around the flame front.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…The reaction mechanism is given in the form of elementary equations to describe a general chemical reaction in detail and it has been validated in shock tube, rapid compression machine, jet stirred reactor, and ICE over a wide range of conditions by Jia . Because the hydrogen oxidation model is a fundamental submodel in all hydrocarbon fuels, this reaction mechanism also could be used in hydrogen‐enriched gasoline combustion . In addition, the pollutant NO generation is regulated by thermal NO and prompt NO models according to literature .…”

Section: Calculation Models and Model Validationmentioning

confidence: 99%

See 1 more Smart Citation

Effect of different hydrogen blending ratios on combustion process of gasoline‐fueled rotary engine

Pan

Huang

et al. 2019

Env Prog and Sustain Energy

View full text Add to dashboard Cite

The pre‐eminent gasoline rotary engine may be criticized for its unsatisfactory fuel consumption rate and unburnt emissions. The clean and renewable hydrogen fuel is a promising alternative for conventional fuels to improve the combustion process and power performance of the rotary engine. In this article, highly advanced numerical simulation was used to obtain some pivotal results such as the distribution of combustion intermediates, the turbulent kinetic energy, the kinetic rate of reactions, and the fuel concentration fields which are difficult to experimentally achieve. An experimentally validated three‐dimensional dynamic simulation model of a rotary engine coupled with chemical kinetics skeletal mechanism was set up to exactly investigate the effects of hydrogen blending on the combustion process, power performance, and pollutant emissions. The results showed that with the increase of hydrogen mixing ratio, the average pressure and the peak pressure increased in the combustion process. Meanwhile, more combustion active intermediates were generated in both the flame development period and flame propagation period. The mass fraction of OH and H radicals has an increase of 36% and 34%, respectively. The fuel combustion rate rose and the turbulent kinetic energy increased which are conducive to improving flame diffusion in the rear part of the chamber and thus facilitate the complete combustion of the fuel. Moreover, the hydrogen blending led to an effective reduction in the CO emission of gasoline‐fueled rotary engine; however, the NO emission slightly increased due to the rise of temperature in cylinder. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

show abstract

Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Calculation Models and Model Validationmentioning

confidence: 99%

Effect of different hydrogen blending ratios on combustion process of gasoline‐fueled rotary engine

Pan

Huang

et al. 2019

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…Figure 2 shows the relative locations of the port fuel injector, the direct injector, and the spark plug in the CFD model. stirred reactor, flow reactor, and homogeneous charge compression ignition (HCCI) engine, and it has also been widely applied or verified in other studies [32][33][34]. The NOx mechanism, a so-called extended Zeldovich mechanism, comes from Tao's work [35], which is widely referenced in published articles [36][37][38].…”

Section: Geometric Model and Boundary Conditionsmentioning

confidence: 99%

Inner Selective Non-Catalytic Reduction Strategy for Nitrogen Oxides Abatement: Investigation of Ammonia Aqueous Solution Direct Injection with an SI Engine Model

et al. 2019

Energies

View full text Add to dashboard Cite

This study contributes to a method based on an aqueous solution of ammonia direct injection for NO x emissions control from internal combustion engines. Many previously published studies about deNO x technology are based on selective catalytic reduction (SCR), but only few deal with inner selective non-catalytic reduction (inner SNCR) technology, which is an intensive improvement of selective non-catalytic reduction (SNCR) applied in the in-cylinder purification procedure. Before numerical calculations were carried out, the computational fluid dynamic (CFD) simulation model was validated with steady-state experimental results. The main results revealed that with the increasing concentration of aqueous solution of ammonia, nitrogen oxides gradually decrease, and the largest decline of NO x is 65.1% with little loss of cylinder peak pressure. Unburned hydrocarbon (UHC) and carbon monoxide (CO) may increase using inner SNCR, and soot emissions show a decreased tendency. However, there is little change when ammonia content varies. Ulteriorly, refining the direct injection phase is of great help to inner SNCR technology to enhance the reduction of NO x and reduce NH 3 oxidation and NH 3 slipping.Energies 2019, 12, 2742 2 of 18 water emulsion diesel as compared with diesel fuel. Adnan et al. [10] conducted an experimental investigation on the optimum water injection timing for power augmentation and emission control of a hydrogen fueled compression ignition (HFCI) engine. The results show that a longer injection duration introduces more water droplets into the cylinder, reducing the in-cylinder charge temperature, which leads to NO x reduction. Although, the amount of water by injecting or emulsifying requires special attention. Excessive water injection may lead to decreased power performance and increased incomplete combustion [11]. Thus, the NO x emissions are limited by increasing the amount of the injected water.SCR has been widely applied in the exhaust after-treatment device of internal combustion engines (ICE). Compared with the three-way catalytic converter (TWC), SCR is not strictly restricted by the equivalence ratio [12]. Thus, the application of SCR has more rationality and scientificity in lean burn gasoline engines and diesel engines. However, the traditional SCR technology has some blemishes, such as poor durability of SCR catalyst [13], narrow temperature window for active deNO x [14], catalyst deactivation due to particulates accumulation [15], catalyst poisoning effect caused by heavy metals (Pb, Zn, and so on, and their oxides) [16], high cost, and difficult recovery by using the noble metal catalysts. The miniaturization and compactification of SCR equipment are also very important factors, which influence the automobile lightweight, especially the passenger car [17]. These limitations led researchers to begin to focus on selective non-catalytic reduction (SNCR), which is another technical route to reduce NO x emissions. As a result of getting rid of the reliance on catalysts, engines with SNCR tec...

show abstract

“…However, it is undeniable that the combustion performance of the rotary engine still needs further improvement even if it uses the natural gas/hydrogen blended fuel. This is because the structure and operation characteristics of the rotary engine itself cause two inherent defects, , specifically the following: (1) The mixture at the back of the cylinder cannot burn in time. The main reason for this defect is that the flow field in the cylinder at the combustion stroke is a unidirectional flow, the direction of which is from the back to the front of the cylinder.…”

Section: Introductionmentioning

confidence: 99%

“…The main reason for this defect is that the flow field in the cylinder at the combustion stroke is a unidirectional flow, the direction of which is from the back to the front of the cylinder. The unidirectional flow makes the flame difficult to propagate to the back of the cylinder against the direction of the unidirectional flow . (2) The fuel leakage caused by apex seal leakage (ASL) is a defect.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Combustion Performance of a Natural Gas/Hydrogen Dual Fuel Rotary Engine under the Action of Apex Seal Leakage

et al. 2020

View full text Add to dashboard Cite

Direct injection (DI) technology can improve the combustion performance of the rotary engine by realizing the fuel stratification in the cylinder. The purpose of this paper is to numerically investigate the influence of hydrogen DI strategy on the combustion process in a DI natural gas/hydrogen rotary engine. In addition, it should be noted that the apex seal leakage (ASL) problem is difficult to avoid in the actual work process of the rotary engine. Meanwhile, the ASL flow can significantly change the fuel movement and flame propagation in the rotary engine. Therefore, the action of ASL cannot be ignored for the in-depth study of the combustion process. In this paper a 3D dynamic simulation model considering ASL was first established and verified by particle image velocimetry (PIV) results and in-cylinder-pressure experiment results. Further, based on the established 3D model, the fuel movement and flame propagation process of the DI natural gas/hydrogen rotary engine under varied hydrogen injection position and hydrogen injection timing were numerically studied. By comparing the fuel distribution and combustion speed of all calculation cases, an ideal hydrogen distribution which could improve the engine combustion efficiency was obtained. The ideal hydrogen distribution is that, under the premise of ensuring minimized hydrogen leakage, the hydrogen should mainly distribute in the middle and front of the cylinder, and a high hydrogen concentration should distribute around the spark plug. Under the guidance of the research results of this paper, to promote the engine combustion performance in the actual engine development, the position which is located at the intersection between the cylinder form line and the major axis is recommended as the installation position of the hydrogen nozzle, and 240°CA (BTDC) is recommended as the injection timing of the hydrogen nozzle.

show abstract

A comparative study of mixture formation and combustion processes in a gasoline Wankel rotary engine with hydrogen port and direct injection enrichment

Cited by 52 publications

References 72 publications

Effect of different hydrogen blending ratios on combustion process of gasoline‐fueled rotary engine

Effect of different hydrogen blending ratios on combustion process of gasoline‐fueled rotary engine

Inner Selective Non-Catalytic Reduction Strategy for Nitrogen Oxides Abatement: Investigation of Ammonia Aqueous Solution Direct Injection with an SI Engine Model

Numerical Investigation on the Combustion Performance of a Natural Gas/Hydrogen Dual Fuel Rotary Engine under the Action of Apex Seal Leakage

Contact Info

Product

Resources

About