Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters

Askari, Omid; Metghalchi, Hameed; Hannani, Siamak Kazemzadeh; Hemmati, Hadis; Ebrahimi, Reza

doi:10.1115/1.4026204

Cited by 40 publications

(9 citation statements)

References 33 publications

(27 reference statements)

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“…This can be attributed to higher adiabatic flame tem perature of H2 compared to CH4 gas. Similar trend was observed by Ghoniem et al [34], Bose and and Banerjee [35], and Askari et al [36]. They similarly attribute the increased NOx formation to the high flame temperature experienced in hydrogen combus tion.…”

Section: Thermal Fieldsupporting

confidence: 85%

Experimental Study on the Effect of Hydrogen Enrichment of Methane on the Stability and Emission of Nonpremixed Swirl Stabilized Combustor

Sanusi

Habib

Mokheimer

2014

Journal of Energy Resources Technology

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An ultra lean mixture (0< O .5 ) o f methane-hydrogen-air was experimentally investi gated to explore the effect o f fuel flexibility on the flame stability and emission o f a non premixed swirl stabilized combustor. In order to isolate the effect o f hydrogen addition to methane, experiments were carried out at fixed fuel energy input to the combustor while increasing the hydrogen content from 0% up to 50% in the methane-hydrogen mixture on volume basis. The combustor fuel energy was then increased up to the range o f typical gas turbine combustors. Equivalence ratio sweep was carried out to determine the lean stability limit o f the combustor. Results show that the hydrogen c ontent in the fuel mixture and fuel energy input have a coupled effect on the combustor lean blow o ff velocity (LBV), temperature and emissions. The LBV increases by ~103% with the addition o f 30% H2. On the other hand, the LBV increases by ~20% as the fuel energy increases from 1.83MWIm3 to 2.75 MWIni3. Burning under ultra lean condition sen>es two pur poses. (I) The excess air supplied reduces the overall combustor temperature with its ensuing effect on low NOx formation. (2) It increases the overall combustor volume flow rate which reduces the residence time fo r NO, formation. The axial temperature profile presented along with the emission data can serve as basis fo r the validation o f numerical models. This would give more insight onto the effect o f hydrogen on the turbulence level and how it would improve the localized extinction o f methane in a cost-effective way.

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Section: Thermal Fieldsupporting

confidence: 85%

Experimental Study on the Effect of Hydrogen Enrichment of Methane on the Stability and Emission of Nonpremixed Swirl Stabilized Combustor

Sanusi

Habib

Mokheimer

2014

Journal of Energy Resources Technology

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“…A data acquisition system was used to capture the pressure-time data. The vessel was also fitted with band heaters which allow the vessel to be heated to an initial tem perature of 500 K [12,13], Figure 1 shows a schematic the cylin drical vessel installed in a Z-type shadowgraph system.…”

Section: Experimental Facilitiesmentioning

confidence: 99%

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Rokni

Moghaddas

Askari

et al. 2014

Journal of Energy Resources Technology

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Laminar burning speeds and flame structures of spherically expanding flames of mixtures o f acetylene (C2H2) with air have been investigated over a wide range of equivalence ratios, temperatures, and pressures. Experiments have been conducted in a constant vol ume cylindrical vessel with two large end windows. The vessel was installed in a shadow graph system equipped with a high speed CMOS camera, capable of taking pictures up to 40,000 frames per second. Shadowgraphy was used to study flame structures and transi tion from smooth to cellular flames during flame propagation. Pressure measurements have been done using a pressure transducer during the combustion process. Laminar burning speeds were measured using a thermodynamic model employing the dynamic pressure rise during the flame propagation. Burning speeds were measured for tempera ture range o f300-590 K and pressure range of 0.5-3.3 atm, and the range of equivalence ratios covered from 0.6 to 2. The measured values of burning speeds compared well with existing data and extended for a wider range of temperatures. Burning speed measure ments have only been reported for smooth and laminar flames.

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“…Hence it has been widely investigated in engines [1][2][3][4] and even it main components (methane) was involved in some fundamental studies [5,6]. Compared with diesel and gasoline, natural gas exhibits lower carbon emission for its high hydrocarbon ratio [7], besides, it is free from aromatic compounds thus results in low PM emission [4].…”

Section: Introductionmentioning

confidence: 99%

Effects of H2 and CO enrichment on the combustion, emission and performance characteristics of spark ignition natural gas engine

Gao

Zhu

et al. 2016

Fuel

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h i g h l i g h t sCO is less effective than H 2 in improving engine combustion and thermal efficiency. Both CO and H 2 smoothes engine operation and lowers THC emission. CO is less effective in improving the laminar flame speed of CH 4 than H 2 . a b s t r a c tFuel reforming is an attractive way for improving the performances of internal combustion engine. The primary components of the reformed gas are H 2 , CO, CO 2 and N 2 . A detailed knowledge of each component in reformed gas is essential for judging or making better use of the reformed gas as well as reforming technologies. In this paper, the influences of the major combustibles of the reformed gas, H 2 and CO, on the performances of a lean burn spark ignition natural gas engine are investigated. Results indicate that addition of H 2 and CO could improve in-cylinder combustion, smooth engine operation and increase engine thermal efficiency. With the addition of H 2 and CO, both the peaks of in-cylinder pressure and heat release rate increase, flame development duration and rapid combustion duration as well as CovIMEP decrease. However, CO is less effective compared with H 2 . The influence of H 2 on engine THC emission is insignificant while addition of CO tends to increase engine CO emission remarkably owing to the quenching and crevice effect. Both H 2 and CO tend to worsen engine NO x emission due to the increased in-cylinder temperature while the effect of H 2 is more distinct. The simulation of laminar flame speed manifests that addition of H 2 and CO increase O, H and OH radical concentration and hence improve the flame propagation and the combustion process, resulting in improved laminar flame speed of the fuel-air mixtures. In compare, H 2 addition leads to higher laminar flame speed than CO addition does. The whole investigation of this paper implies that both H 2 and CO in the reformed gas are effective in improving engine combustion and effective thermal efficiency while H 2 is more effective.

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Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters

Cited by 40 publications

References 33 publications

Experimental Study on the Effect of Hydrogen Enrichment of Methane on the Stability and Emission of Nonpremixed Swirl Stabilized Combustor

Experimental Study on the Effect of Hydrogen Enrichment of Methane on the Stability and Emission of Nonpremixed Swirl Stabilized Combustor

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Effects of H2 and CO enrichment on the combustion, emission and performance characteristics of spark ignition natural gas engine

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