Simulation and experimental investigation of swirl-loop scavenging in two-stroke diesel engine with two poppet valves

Xu, Zheng; Ji, Fenzhu; Ding, Shuiting; Zhao, Yunhai; Wang, Yan; Zhang, Qi; Du, Feng; Zhou, Yu

doi:10.1177/1468087420916083

Cited by 19 publications

(4 citation statements)

References 32 publications

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“…The spray model includes nozzle flow, spray atomization, droplet breakup, collision, coalescence, vaporization, and wall impingement (Zhu, 2019;Feng et al, 2021). The radius of influence model was chosen because of its independence on the CFD mesh size (Costa et al, 2014;Xu et al, 2020b). The model set up three injection nozzles and four ITs to research its effect on GDI engine performance, and Table 2 shows the detailed simulation operating conditions (Potenza et al, 2019;Liu Z. et al, 2021).…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical Investigations of Injection Timing Effects on a GDI Engine Performance: Part B, In-Cylinder Emission Formation and Oxidation Process

et al. 2022

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The emphasis on environmental protection and energy security has promoted automobile engine technology toward low emission and economy. While the traditional port fuel injection engine can hardly meet the latest regulations and requirements, the gasoline direct injection (GDI) engine becomes a hot research topic because of its potential to reduce fuel consumption and emissions. Since injection timing has a determining effect on overall engine performance, this paper aimed to investigate the injection timing effects on mixture formation and emissions. A validated three-dimensional numerical simulation model of a 4-stroke GDI engine combustion chamber was adopted. In a previous work (Part A), the in-cylinder combustion process has been discussed. In this study, the simulation results demonstrate that with the injection timing advancing, the fuel–gas mixture was more uniformly distributed and combusted more completely; the CO, UHC, and soot had decreased sharply by 80.6, 99.2, and 97.5%; the NOx emission increased by 151.7%. The optimized injection timing for this case was 300 CA BTDC. Moreover, this paper studied the in-cylinder views of injection timing effects on mixture formation and emission, providing reference to optimize injection of GDI engine.

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Section: Numerical Modelmentioning

confidence: 99%

Numerical Investigations of Injection Timing Effects on a GDI Engine Performance: Part B, In-Cylinder Emission Formation and Oxidation Process

et al. 2022

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“…Traditional direct injection is characterized by extremely high injection pressure and good atomization quality [9]. However, the high-pressure fuel pump and fuel rail reduce the power-to-weight ratio of the engine, and the highpressure fuel also increases the risk of fuel leakage, which cannot meet the requirements of aviation engines [10,11]. By contrast, the air-assisted fuel injection (AAFI) system, which is a low-pressure direct injection system developed by Orbital Inc., uses the expansion of compressed air bubbles to shear fuel droplets.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effects of Injection Parameters on the Air-Assisted Diesel Spray Characteristics

Zhao

2022

International Journal of Aerospace Engineering

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The air-assisted fuel injection (AAFI) system may be installed in the spark ignition aviation piston engine for the atomization of heavy fuels. However, studies on the effects of injection parameters on the spray characteristics are insufficient, which affects the improvement of AAFI engine performance. In this study, air-assisted diesel spray characteristics are investigated experimentally using a high-speed backlit imaging technique. The effects of main air-assisted injection control parameters such as fuel injection pressure, fuel temperature, and fuel injection duration on the spray characteristics are examined. The results show that spray shape changes from “spindle” to “cone” with an increase in fuel injection pressure. As the fuel injection pressure increases to 1.0 MPa, both the spray penetration and spray width increase significantly. “Protrusions” appear on the spray edge at high fuel temperatures. When the fuel temperature drops to 268 K, the spray penetration and spray width increase slightly. The spray shrinks significantly in both the axial and radial directions with an increase in fuel injection duration. Key parameters that directly affect air-assisted spray characteristics include the difference between the fuel-air mixture injection pressure and the ambient pressure, the density of fuel-air mixture in the air-assisted injector premixed chamber, and the kinetic energy density of the fuel. The former two parameters affect the spray penetration while the latter affects the spray width. The study is beneficial for the design of AAFI engines.

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“…Xu ve ark. iki popet valfli iki zamanlı dizel bir motor için süpürme verimliliği için yapmış oldukları çalışmada girdap döngüsü süpürme konfigürasyonu önerisi modellenmiştir [7]. Choe ve ark.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Parametric Investigation of Theoretical Cycles of Two-Stroke Gasoline Engines

ORMAN

2022

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Özellikle küçük tarım makinelerinde, küçük ulaşım araçlarında ve düşük kapasiteli güç jeneratörlerinde sıklıkla tercih edilen iki zamanlı motorlar 19. yüzyıldan bu yana kullanılmaktadır. Bu çalışmada basit bir termodinamik model oluşturulmuş ve motor performansını etkileyici tasarım parametrelerinden geometrik sıkıştırma oranı, egzoz açılma açısı ve biyel uzunluğu-krank yarıçapı oranı parametrelerinin etkileri 50 cc kurs hacmine sahip bir motorun performansı için sayısal olarak incelenmiştir. Buna göre bu üç parametrenin efektif sıkıştırma oranı, maksimum sıcaklık, maksimum basınç ve efektif güç parametrelerine etkileri üçlü grafiklerle incelenmiştir. Böylelikle her üç tasarım parametresinin etkisi tek bir grafikle incelenmiştir. Yapılan sayısal inceleme neticesinde motor performansını en etkileyen tasarım parametresinin geometrik sıkıştırma oranı olduğu görülmüştür. Bununla birlikte biyel uzunluğu-krank yarıçapı oranının artırılması da motor performansını belirgin bir biçimde iyileştirmektedir. Egzoz açılma açısının düşük tercih edilmesinin motor performansını iyileştirdiği görülmüştür. Burada sunulan sonuçlar özellikle motor tasarımcılarının kullanabileceği niteliktedir.

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Simulation and experimental investigation of swirl-loop scavenging in two-stroke diesel engine with two poppet valves

Cited by 19 publications

References 32 publications

Numerical Investigations of Injection Timing Effects on a GDI Engine Performance: Part B, In-Cylinder Emission Formation and Oxidation Process

Numerical Investigations of Injection Timing Effects on a GDI Engine Performance: Part B, In-Cylinder Emission Formation and Oxidation Process

Experimental Investigation on the Effects of Injection Parameters on the Air-Assisted Diesel Spray Characteristics

Parametric Investigation of Theoretical Cycles of Two-Stroke Gasoline Engines

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