June 2024
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6 Reads
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1 Citation
International Journal of Heat and Mass Transfer
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Publications (9)
June 2024
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17 Reads
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1 Citation
Combustion and Flame
March 2024
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16 Reads
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3 Citations
Fuel
November 2023
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41 Reads
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6 Citations
Combustion and Flame
April 2023
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48 Reads
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7 Citations
Fuel
January 2023
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23 Reads
January 2023
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14 Reads
March 2022
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35 Reads
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13 Citations
Journal of Fluids Engineering
The entrainment coefficient reflects the air-fuel mixing quality, which is one of the foremost concerns for the development of cleaner and higher power-density internal combustion engines. Previous prediction models constructed by the change of axial mass flow rate have lower accuracy under high injection pressure conditions. During modeling in the work, a new construction method based on local entrainment velocity and local entrainment area is developed, and the influences of dilution effect and forces such as flow resistance, lateral pressure, etc. on local entrainment velocity are considered. With the modified model, its prediction accuracy can be effectively extended to high injection pressure and detailed information about entrainment can be provided for analysis. It is found that, with the increase of injection pressure, the entrainment coefficient rises in the whole flow field. When increasing to high injection pressure, the entrainment coefficient constantly decreases with distance in the far-field, which is consistent with the experiments, but not a constant value predicted by previous models. Besides, the decreased rate rises with the increase of injection pressure. Meanwhile, the increase of ambient pressure also makes the entrainment coefficient rise, but barely influences the decreased rate in the far-field. The large decrease of local entrainment velocity in the far-field caused by strong resistance can explain the decrease of entrainment coefficient with distance. Overall, the modified model can rapidly predict the spray mixing quality over a wider range of operating conditions and provide more detailed entrainment information for analysis.
January 2022
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20 Reads
SSRN Electronic Journal
Citations (3)
... 204 Considering that the system in this study is a binary ammonia-nitrogen system, it is suitable to determine 205 the mode transition time using the criterion based on the temperature-fuel mole fraction (T-x) line versus the 206 vapor-liquid equilibrium (VLE) line proposed by Mo et al [5]. The Peng-Robinson cubic equation of state 207 (PR-EoS) was used to calculate the VLE of the binary system and the critical parameters for ammonia and 208 nitrogen were shown in Table 3. PR-EoS was widely used to calculate the thermodynamic properties of 209 mixture and phase equilibria at high pressures with good reliability [30,35,36]. Recently, Vrabec et al. [37] 210 studied the VLE of ammonia with supercritical gases (Ar, CH4, H2, N2, O2). ...
- Citing Article
June 2024
Combustion and Flame
... The process can be divided into distinct regimes: primary atomization near the nozzle, air-induced breakup, and fuel-air entrainment [25]. Aerodynamic forces at the liquid-gas interface significantly influence spray characteristics, yet many studies are constrained to single-or two-scale approaches due to limitations in optical window size and camera resolution [26][27][28][29]. Marine diesel engines, characterized by larger bore diameters, demand investigations into extended spray evolution times and scales to address their unique operational challenges. ...
- Citing Article
March 2024
Fuel
... Figure 3 shows the model of the reverse tumble combustion system. To ensure the accuracy of the calculations, the spray model was selected on the basis of spray test data from a constant volume chamber, and the combustion model was selected on the basis of the cylinder pressure curve and the heat release rate curve, since the atomization and mixing processes are critically important for the combustion characteristics [17]. The spray model calibration was based on the AVL-FIRE software. ...
- Citing Article
March 2022
Journal of Fluids Engineering