Numerical and experimental study of spray impingement and liquid film separation during the spray/wall interaction at expanding corners

Zhang, Yanzhi; Duan, Huiquan; Wang, Pengfei; Wang, Jiangxiang; Liu, Hong; Xie, Maozhao

doi:10.1016/j.ijmultiphaseflow.2018.05.016

Cited by 24 publications

(7 citation statements)

References 27 publications

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“…Based on previous works, Zhang et al [191] improved the spray-wall interaction model with special emphasis on the high-injection pressure condition and achieved reasonably accurate predictions for the penetration of the impinging sprays and the secondary droplet characteristics compared to experimental data. They further improved the model by considering the film separation criterion, mass ratio of the film separation, and film atomization model based on the Rayleigh-Taylor (RT) instability theory [192]. The results showed good agreement between the predicted size distribution of the detached droplets and the experimental data using the improved model, as shown in Fig.…”

Section: Spray-wall Interactionmentioning

confidence: 90%

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Spray–turbulence–chemistry interactions under engine-like conditions

Zhou

Zhao

Luo

et al. 2021

Progress in Energy and Combustion Science

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Section: Spray-wall Interactionmentioning

confidence: 90%

“…The improved model demonstrated a better ability of capturing film separation characteristics. In the wall film separation model by Zhang et al [192], a new separation criterion coupled with the film atomization model based on the RT instability theory is adopted:…”

Section: Spray-wall Interactionmentioning

confidence: 99%

Spray–turbulence–chemistry interactions under engine-like conditions

Zhou

Zhao

Luo

et al. 2021

Progress in Energy and Combustion Science

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“…Quasi-dimensional multi-component vaporization models for fuel droplet 42,43 and wall film 44 were adopted. To capture the spray/wall interaction and wall film dynamics behaviors, improved spray/wall interaction 45 and wall film dynamics 46,47 models were used. To reproduce the turbulent characteristics within the cylinder, the Re-normalization Group k-e model was used.…”

Section: Cfd Model and Model Validationmentioning

confidence: 99%

Multiple-objective optimization of heavy-duty compression ignition engine fueled by gasoline/hydrogenated catalytic biodiesel blends at low loads

Zhang

Wang

et al. 2021

International Journal of Engine Research

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Multiple-objective optimization of a heavy-duty compression ignition engine fueled by gasoline/hydrogenated catalytic biodiesel (HCB) blends at low loads was performed by employing the KIVA-3V code and genetic algorithm. In addition, the mechanism of multiple-injection and sensitivity of operating parameters on engine performance of the optimal cases were also explored. The results indicated that efficient combustions for G70H30 (70% gasoline and 30% HCB) and G100 (pure gasoline) with ultra-low nitrogen oxides (NOx) and soot emissions could be obtained after optimization. As HCB fraction increases, the ranges of operating parameters become more extensive, and the required initial temperature for optimal cases can be effectively reduced. When the main injection occurs after the ignition caused by pilot injection, main injection moderates the heat release rate (HRR) by creating concentration and temperature stratifications in the spray area simultaneously, and the exhaust gas recirculation (EGR) rate, pilot, and main start of injections and pilot fraction play dominant roles on engine performance. Moreover, when main injection is much more advanced than the ignition timing, main injection controls the HRR only through the concentration stratification in the reaction zone, and the EGR rate, initial temperature, and pilot faction have dominated effects on engine performance.

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“…In modern diesel homogeneous charge compression ignition (HCCI) engines, the phenomenon of spray-wall impingement is inevitable 1 . This causes the formation of fuel film over the piston surface, which affects the combustion, thermal efficiency, and emissions, as well as heat loss 2 – 4 . Transient heat transfer plays an important role in this process.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer for diesel spray impingement on a high temperature wall

Guo

Zhang

Jin

et al. 2022

Sci Rep

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In this paper, the heat transfer characteristics of spray-wall impingement on a high temperature wall were studied by using a transient thermocouple and a one-dimensional finite-difference conduction model to obtain variations of wall temperature and heat flux. Results showed that increasing the injection pressure and decreasing the ambient temperature both caused an increase in surface heat flux and heat transfer coefficient. However, with the increase of the initial surface temperature from 200 to 600 °C, the surface heat flux and heat transfer coefficient first increased and then decreased, and reached the maximum at about 520 °C and 390 °C respectively, which was due to the change of heat transfer regime on the wall. The contribution of experimental factors descended in the order of initial surface temperature, injection pressure and ambient temperature. The dimensionless surface heat fluxes in terms of Biot and Fourier numbers were highly similar and a dimensionless correlation was developed to quantify this heat transfer behavior, which showed that the ratio of the thermal resistance of the high temperature wall to the thermal resistance of convection heat transfer on the wall surface changed almost linearly during the process of spray-wall impingement.

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Numerical and experimental study of spray impingement and liquid film separation during the spray/wall interaction at expanding corners

Cited by 24 publications

References 27 publications

Spray–turbulence–chemistry interactions under engine-like conditions

Spray–turbulence–chemistry interactions under engine-like conditions

Multiple-objective optimization of heavy-duty compression ignition engine fueled by gasoline/hydrogenated catalytic biodiesel blends at low loads

Experimental investigation of heat transfer for diesel spray impingement on a high temperature wall

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