Effects of full transient Injection Rate and Initial Spray Trajectory Angle profiles on the CFD simulation of evaporating diesel sprays- comparison between singlehole and multi hole injectors

Safiullah,; Ray, Samir Chandra; Nishida, Keiya; McDonell, Vincent; Ogata, Yoichi

doi:10.1016/j.energy.2022.125796

Cited by 19 publications

(8 citation statements)

References 38 publications

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“…As the spray evolves, the second peak appears closer to the spray tip, according to the stagnation region. In short, the shape of curves is something like a saddleback [28]. On the other hand, the liquid phase equivalence ratio curves show a single peak that reduces with axial distance, indicating that the fuel evaporates at the same rate as it is injected.…”

Section: Probability Density Of Vapor Phase Concentrationmentioning

confidence: 97%

“…This paper does not describe the details of the C-LAS principle since as it was systematically presented in previous papers [22,[24][25][26][27][28]. Here, the C-LAS technique is only illustrated simply, as necessary for reading this paper.…”

Section: Measurement Principlementioning

confidence: 99%

“…However, because of the actual viewpoint and blurriness of the window at high ambient pressure and temperature, the nozzle tip's location could not be seen clearly. Therefore, the first 7 mm downstream of the nozzle tip was eliminated from the original image during image processing to provide a synthetic and clean appearance of the data [24][25][26][27][28][29][30]. The Vis and UV images were then synchronized, and ensemble averaging was applied to six image sequences recorded at each experimental condition.…”

Section: Optical Arrangementmentioning

confidence: 99%

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Evaluation of Vaporizing Diesel Spray with High-Speed Laser Absorption Scattering Technique for Measuring Vapor and Liquid Phase Concentration Distributions

Ray

Safiullah

Naito

et al. 2023

Fuels

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The Conventional Laser Absorption Scattering (C-LAS) technique is used to measure the mixture concentration and visualize the vapor phase. The former is determined by the attenuation of visible and ultraviolet light whereas the latter is achieved via light absorption and scattering theory. The C-LAS uses the Nd: YAG pulsed laser and CCD cameras to provide one spray shot at a particular instance which requires time and effort. However, the temporal measurement of a single spray shot is not possible. To record the distribution of the whole vapor phase in an injection event and measure liquid and vapor concentrations inside the spray, a High-Speed Laser Absorption Scattering (HS-LAS) technique was developed. The HS-LAS consists of continuous diode light sources, high-speed video cameras, and an image intensifier for UV light, which can provide the temporal variation of a single-shot spray. In the experiment, a commercial seven-hole injector with a hole diameter of 0.123 mm allowing high injection pressure of up to 100 MPa was used to avoid the potential inconsistencies with a single-hole test injector. The diesel surrogate fuel which consists of 97.5% n-tridecane and 2.5% of volume-based 1-methylnaphthalene was used. The injection amount of 5.0 mg/hole was selected to investigate the structure and mixture formation process of the spray. The findings of the experiments show that this imaging approach is a promising diagnostic technique for concurrently obtaining quantitative information on the quantity of vapor and droplets in a fuel spray. Furthermore, the turbulent/vortex fluid dynamics’ temporal development/variation can be investigated.

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Section: Probability Density Of Vapor Phase Concentrationmentioning

confidence: 97%

Section: Measurement Principlementioning

confidence: 99%

Section: Optical Arrangementmentioning

confidence: 99%

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Evaluation of Vaporizing Diesel Spray with High-Speed Laser Absorption Scattering Technique for Measuring Vapor and Liquid Phase Concentration Distributions

Ray

Safiullah

Naito

et al. 2023

Fuels

Self Cite

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“…As shown in Fig. 7, the diesel spray with a smaller number of holes is concentrated in a smaller area, and the high temperature area generated by diesel combustion is closer to the bottom of the combustion chamber, which is not conducive to the ignition of methanol (Safiullah et al, 2023). As the number of holes increases, CA50 gradually delays and CD prolongs.…”

Section: Effect Of Diesel Holes Number On Combustion and Emission Per...mentioning

confidence: 98%

Effects of pilot injector specifications on combustion and emissions of diesel-methanol dual-fuel direct injection engine

LV,

WEI,

SONG

et al. 2024

JTST

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Diesel-ignited methanol direct injection engine can achieve high methanol substitution rate and low emissions. The effects of pilot diesel injector specifications, including hole number and installation location, on the combustion and emissions of a diesel-methanol dual-fuel direct injection engine were investigated in this study. The results show that increasing the number of diesel injection holes reduces the proportion of methanol premixed combustion, which is beneficial to reducing ringing intensity (RI) and reducing pollutant emissions. Different pilot injector types and installation positions have a significant impact on the combustion mode of methanol, but have little impact on fuel economy. The equivalent indicated specific fuel consumption (EISFC) is below 165g/kWh in all cases. When the diesel ignition area deviates from the center of the cylinder, methanol mainly undergoes premixed combustion, and NO X , HC, and CO emissions increase significantly. When the diesel combustion area is located in the center of the cylinder, methanol mainly undergoes diffusion combustion, with lower RI and less pollutant emissions.

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“…Adjust the liquid penetration by decreasing the RT constant, the parent parcel breaks up to form new droplets with different KH constants. Using a discrete multi-component (DMC) fuel-vaporization model to represent the vaporization of spray droplets, DMC is formulated to track each component of the fuel regardless of the direction of the process [46,47]. The Adaptive Collision Mesh Model is used in modeling droplet collision and coalescence [48].…”

Section: Mesh and Initial Boundary Condition Settingsmentioning

confidence: 99%

Study of Scavenging and Combustion Processes for Small Two-Stroke Aviation Heavy Fuel Direct Injection Engines

et al. 2023

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Heavy-fuel aviation piston engines (HF-APEs) are widely used in general aviation and unmanned aerial vehicle (UAV) due to their safety and fuel economy. This paper describes a numerical and experimental study of scavenging and combustion processes on a 2-Stroke Direct Injected HF-APEs for light aircraft, with its cylinder specifically designed as cross scavenging. A 3-Dimentional transient model of in-cylinder flow and combustion process is established by the Forte platform, and the engine test system is set up. By comparing the simulation results to the experimental results, it showed that multi-ports cross scavenging can generate unbalanced aerodynamic torque in the cylinder. In the compression process, the swirl ratio (SR) gradually increases, and the peak SR reaches 15. Moreover, approximately 25% of exhaust residual gas in the cylinder is conducive to the fuel atomization and evaporation process in a high-altitude environment. When the injection timing is between −8 °CA and −16 °CA, the engine has the optimal power and economy performance at different altitudes. Finally, when the injection advance angle moves forward by 4 °CA, the maximum pressure increases by 2 MPa, with the rising rate decreasing gradually. The results have important significance for the development of the combustion system of small 2-Stroke Direct Injected HF-APEs.

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Effects of full transient Injection Rate and Initial Spray Trajectory Angle profiles on the CFD simulation of evaporating diesel sprays- comparison between singlehole and multi hole injectors

Cited by 19 publications

References 38 publications

Evaluation of Vaporizing Diesel Spray with High-Speed Laser Absorption Scattering Technique for Measuring Vapor and Liquid Phase Concentration Distributions

Evaluation of Vaporizing Diesel Spray with High-Speed Laser Absorption Scattering Technique for Measuring Vapor and Liquid Phase Concentration Distributions

Effects of pilot injector specifications on combustion and emissions of diesel-methanol dual-fuel direct injection engine

Study of Scavenging and Combustion Processes for Small Two-Stroke Aviation Heavy Fuel Direct Injection Engines

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