Structure of turbulent rich hydrogen-air premixed flames

Sun, Zuo-Yu

doi:10.1002/er.4048

Cited by 42 publications

(3 citation statements)

References 32 publications

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“…The gathered real-time FC data include mainly temperature, the density of exchange current, oxygen pressure, hydrogen pressure, etc. 51 Because the energy from solar panels is utilized in water electrolyzation for hydrogen production, to maintain high FC performance water management is an important factor. 52 Too much water will negatively affect the internal reactant transportation, reducing the durability and stability of fuel cell operation.…”

Section: Analyzing the Voltage Stability Of The Pvh-fcmentioning

confidence: 99%

Reactive power control of hybrid systems using improved coyote optimizer

Chen

Zhou

et al. 2023

Concurrency and Computation

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SummaryA new method of reactive power control by photovoltaic and hydrogen is presented in this study. Photovoltaic has been employed for harvesting the hydrogen which is based on considering the weather conditions. The proposed system includes a combination of photovoltaic, hydrogen, and fuel cell along with a DG to connect to the grid and to improve the supply power quality. The main contribution of this paper is to direct an improved metaheuristic algorithm, called improved coyote optimization (CO) algorithm for achieving a proper DG placement. The improved version of the CO algorithm has benefitted from a spiral policy that is derived from Whale optimization algorithm. This process makes better control for the social behavior of the coyotes. Reactive power optimization (RPO) has been established after the size selection objective function. Big data technology is also used for improving the historical solution matching‐based RPO appliance. Cosine distance is used for measurement purposes of the historical solution matching‐based similarity technique during the computation time of conventional RPO and PVH‐FC features. As a result of using the suggested CO, the costs for electricity and losses are reduced by around 86.6% and 26.9%, respectively. Additionally, realized profits showed that applying the suggested strategy reduced the overall cost from 9.315e6 to 4.435e6 units. After optimization, the network loss and power are finally reduced to 1325 Kvar and 1371 kW, respectively. The results show that the suggested RPO technique has higher speed of calculation in comparison with some latest algorithms. Achievements also show that the suggested method provides a proper and optimal solution for RPO.

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Section: Analyzing the Voltage Stability Of The Pvh-fcmentioning

confidence: 99%

Reactive power control of hybrid systems using improved coyote optimizer

Chen

Zhou

et al. 2023

Concurrency and Computation

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“…Through the reasons for the increase in turbulence intensity, more initial cracks are induced on wrinkling curvatures, and the development of the initial cracks is accelerated. Due to hydrodynamic instability, it is strengthened by increasing the density ratio across the flame front [10].…”

Section: IIImentioning

confidence: 99%

Conceptual Approach to Combustor Nozzle and Reformer Characteristics for Micro-Gas Turbine with an On-Board Reforming System: A Novel Thermal and Low Emission Cycle

Kim

Park

2020

Sustainability

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In order to implement moderate or intensive low oxygen dilution (MILD) combustion, it is necessary to extend the flame stability and operating range. In the present study, the conceptual designs of a combustor single nozzle and reformer were numerically suggested for a micro-gas turbine with an on-board reformer. The target micro-gas turbine achieved a thermal power of 150 kW and a turbine inlet temperature (TIT) of 1200 K. Studies on a nozzle and reformer applying an open-loop concept have been separately conducted. For the nozzle concept, a single down-scaled nozzle was applied based on a reference nozzle for a heavy-duty gas turbine. The nozzle can achieve a good mixture with a high swirl with a splined swirl curve lower NOx emissions and smaller pressure drop in the combustor. The concept of the non-catalytic partial-oxidation reforming reformate was designed using the combustor outlet temperature (COT) of the exhaust gas. Feasible hydrogen yields were mapped through the reformer. Based on the hydrogen yields from the reformer, hydrogen was added to the nozzle to investigate its combustion behavior. By increasing the hydrogen addition and decreasing the O2 fraction, the OH concentrations were decreased and widely distributed similar to the fundamental characteristics of MILD combustion.

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“…Although there are multiple breakthroughs in the understanding of combustion characteristics of hydrogen enriched flames in multiple research devices, the applicability of this knowledge is still in its early stage. While there are plenty of research works related to constantvolume chambers, 26,27 scaled burners, 28 or rapid compression machines 29 ; the state-of-the-art in H 2 ICE is more limited and mostly focused on developing engines fueled by pure hydrogen. 30 Nonetheless, this approach is still difficult to implement for commercial transportation in passenger cars due to severe economic constraints.…”

mentioning

confidence: 99%

Advantages of hydrogen addition in a passive pre‐chamber ignited SI engine for passenger car applications

et al. 2021

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Hydrogen is one of the most promising alternative fuels for the transportation industry. The use of hydrogen to enable lean burn in internal combustion engines is an attractive solution for reducing CO 2 emissions from two points of views: the substitution of carbon-based fuels and the increased thermal efficiency due to lean operation. Combining this strategy with the passive prechamber ignition system with gasoline/hydrogen blends is even more interesting. The main limitations of the passive pre-chamber concept in a high compression ratio spark-ignition engine were shown through engine experiments.A numerical study was then performed to evaluate the chance of extending the dilution limit by using hydrogen along with this technology. Results show how the use of hydrogen provides considerable benefits in the main chamber combustion process by enhancing the thermo-chemical properties of the mixture, increasing the flame speed, and improving the flame structure. Using an adequate gasoline-hydrogen blend proved to enable optimum burning rates at lean conditions, leading to a relevant thermal efficiency gain. K E Y W O R D Scomputational fluid dynamics, hydrogen combustion, passive pre-chamber, spark-ignition engine, ultra-lean combustion | INTRODUCTIONEvery year, the energy crisis associated with the world's demand of natural resources, used to power the industrial infrastructure of society, is becoming more urgent. 1 As human population grows, so does the consumption of energy coming from the limited fossil fuels that are available in the planet. Additionally, burning these fuels contributes to the production of greenhouse gases (GHG) like carbon dioxide (CO 2 ), hydro-carbon (HC), and other air-polluting emissions. These facts motivated several global treaties based on multiple research works, such as the Paris Agreement, 2 to aim for a decarbonization of the global energy network to improve sustainability and reduce pollution.List of Symbols/Abbreviations: SI, spark ignition; CI, compression ignition; TJI, turbulent jet ignition; HAJI, hydrogen assisted jet ignition; MC, main combustion chamber; PC, pre-chamber; ICE, internal combustion engine; H 2 ICE, hydrogen internal combustion engine; CFD, computational fluid dynamics; NO x , nitrogen oxides; H 2 , hydrogen; TWC, three-way catalyst; PFI, port fuel injection; DOHC, double over-head camshaft; CO 2 , carbon dioxide; λ, relative air-to-fuel ratio; RON95, 95 research octane number; CCV, cycle-to-cycle variability; TDC, top dead center; CAD, crank-angle degree; HRR, heat release rate; Δp, pressure difference between the pre-chamber and the main chamber; CA50, combustion phasing; IMEP, indicated mean effective pressure; σIMEP, variability of the indicated mean effective pressure; MAPO, maximum amplitude pressure oscillation; MBT, maximum break torque; ST, spark timing; URANS, unsteady Reynoldsaveraged Navier Stokes; ECFM, extended coherent flamelet model; TKE, turbulent kinetic energy; s L , laminar flame speed; l f , flame thickness; l t , turbulence length scale;...

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Structure of turbulent rich hydrogen-air premixed flames

Cited by 42 publications

References 32 publications

Reactive power control of hybrid systems using improved coyote optimizer

Reactive power control of hybrid systems using improved coyote optimizer

Conceptual Approach to Combustor Nozzle and Reformer Characteristics for Micro-Gas Turbine with an On-Board Reforming System: A Novel Thermal and Low Emission Cycle

Advantages of hydrogen addition in a passive pre‐chamber ignited SI engine for passenger car applications

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