Experimental investigation on the spray characteristics of a droplet under sinusoidal inertial force

Liu, Fushui; Kang, Ning; Li, Yikai; Wu, Qing

doi:10.1016/j.fuel.2018.04.008

Cited by 35 publications

(6 citation statements)

References 41 publications

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“…Recently, the ability of TRF to characterize the soot formation characteristics of gasoline has drawn more attention since gasoline direct injection (GDI) engines are facing the soot emissions due to nonhomogeneous air-fuel mixing as a result of in-cylinder mixture preparation − and emissions regulations are becoming more stringent . Toluene is the representative of aromatics in gasoline, which is crucial for the prediction of soot formation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Toluene Addition on the PAH Formation in Laminar Coflow Diffusion Flames of n-Heptane and Isooctane

Liu

Hua

et al. 2018

Energy Fuels

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Characterization of soot formation is becoming more important for gasoline surrogate fuels, requiring a deeper understanding of the effect of toluene ratio on PAHs formation. In this work, the different size PAHs distribution in laminar diffusion flames was measured by PLIF technique, and the chemiluminescences of OH and CH radicals were recorded by ICCD coupled with band-pass filters. The effect of toluene addition to n-heptane and isooctane on the flame and PAHs formation was comparatively studied. Then, the chemical kinetic of PAHs was analyzed using the CHEMKIN Diffusion Flame model. The experimental results showed that the cool flame area ranks as n-heptane > isooctane > toluene may due to the NTC action. The OH intensity and flame lift-off height show a monotonous increasing trend with the toluene ratio. At the same toluene ratio, the peak OH intensity and flame lift-off height of n-heptane/toluene is lower than that of isooctane/toluene. The CH intensity in nheptane, isooctane, and toluene flames shows completely different distribution characteristics. As the toluene ratio increases, the 320 nm-LIF in n-heptane and isooctane flames shows a weakening monotonous increasing trend with different inflection points. The 360/400/450 nm-LIF in n-heptane and isooctane flames show a nonmonotonic trend with different peak points. The peak point is 50% toluene ratio in n-heptane/toluene flames and 40% in isooctane/toluene flames, and it corresponds exactly to the smoke point of the flame. The kinetic analysis showed that the benzyl has a significant effect on the formation of A2−A4 through the generation of C 10 H 9 , C 9 H 7 , and C 14 H 12 . A1 trend is dominated by C 6 H 5 CH 3 + H = A1 + CH 3 and A1 − + CH 4 → A1 + CH 3 . The trends of A2, A3 and A4 are mainly dominated by the reactions between their own dehydrogenation groups with H 2 .

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Section: Introductionmentioning

confidence: 99%

Effect of Toluene Addition on the PAH Formation in Laminar Coflow Diffusion Flames of n-Heptane and Isooctane

Liu

Hua

et al. 2018

Energy Fuels

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“…Faraday technique is a new research method used in the literature to explain the mechanism underlying atomization formation in this field. Although there is a limited number of research on this subject, Fushui Liu et al Revealed an experimental study [11]. In the study, they revealed the effects of frequency, liquid amount, surface tension, and liquid density on atomization.…”

Section: Introductionmentioning

confidence: 99%

Görüntü İşleme Yöntemi̇ İle Si̇nüzoi̇dal Atalet Kuvvetleri̇ Altinda Benzi̇n Atomi̇zasyon Kali̇tesi̇ni̇n Beli̇rlenmesi̇

Tanyeri

Atila

Ucar

et al. 2022

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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The atomization quality has gained importance with the used of injection systems in internal combustion engines. The atomization quality has been increased by raising spray pressures by the way advances in the production technologies of high-pressure pumps and injectors. In the current situation, the spray pressures in Gasoline Direct Injection (GDI) technology have been reached bar levels between 200 and 800. When the pressure level is raised higher than the specified pressure value, it is understood from studies in the literature that the atomization quality is not provided a significant improvement and the production cost increase due to the technology required for high pressure. In this paper, the fuel has been atomized by using Sinusoidal Intertidal Forces (SIF) as another method to improve the atomization quality. In the literature, there is no any study regarding the suitability of using by atomized under SIF of the gasoline fuel used in internal combustion engines. In the application study, the gasoline fuel has been atomized without the pressure by manufactured SIF generator and the droplet images obtained analysis result has been examined by using the image processing method. According to analysis results, it has been observed that the droplets sizes produced with SIF method were similar results to the droplet sizes founded using the GDI method. It has been determined that the smaller droplet sizes can be obtained with lower costs without using pressure thanks to this method and the method can be applied efficiently in internal combustion engines.

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“…1,2 Many new technologies have been developed and then applied to diesel engines to meet more and more stringent vehicle emission regulations and the high requirement for fuel economy performance. 3–11 These new technologies—such as the multiple injections, 12 exhaust gas recirculation (EGR), 13 and variable geometry turbocharger (VGT) or variable nozzle turbocharger 14 —mainly focused on the in-cylinder combustion optimization and exhaust after-treatment. 15–17 These novel applications showed a much more significant effect on the diesel engine performance and continuously increased its market share in the highly competitive automotive sector.…”

Section: Introductionmentioning

confidence: 99%

Autoignition characteristics of diesel spray under different injection pressures and cold start strategy for compression ignition engines

Yang

Liu

2020

International Journal of Engine Research

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Poor cold start performance is one of the main factors restricting the application range of compression ignition engines. Stable flame generation in the cylinder is the prerequisite for the successful start of the engine. In order to explore ways to improve the cold start ability of the compression ignition engine, the ignition characteristics of diesel sprays at different injection pressures were studied in a constant volume combustion chamber. A high-speed photography technique was used to obtain the color images of the initial flames of diesel free sprays. And the yellow flame is introduced as the criterion for a successful flame generation. It was found that under moderate injection pressures, the reactant concentration and energy dissipation rate reached equilibrium. Under this condition, the duration of the blue flame is relatively stable, and it is most conducive to the generation of the yellow flame in the cylinder. The negative temperature coefficient phenomenon is also observed, and the temperature range in which this phenomenon occurs is identical with the change of injection pressure. A cold start strategy for the compression ignition engine is proposed by controlling the compression-end temperature in the cylinder to be higher than the threshold ignition temperature of diesel spray.

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Experimental investigation on the spray characteristics of a droplet under sinusoidal inertial force

Cited by 35 publications

References 41 publications

Effect of Toluene Addition on the PAH Formation in Laminar Coflow Diffusion Flames of n-Heptane and Isooctane

Effect of Toluene Addition on the PAH Formation in Laminar Coflow Diffusion Flames of n-Heptane and Isooctane

Görüntü İşleme Yöntemi̇ İle Si̇nüzoi̇dal Atalet Kuvvetleri̇ Altinda Benzi̇n Atomi̇zasyon Kali̇tesi̇ni̇n Beli̇rlenmesi̇

Autoignition characteristics of diesel spray under different injection pressures and cold start strategy for compression ignition engines

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