Experimental study on the effect of nozzle geometry on string cavitation in real-size optical diesel nozzles and spray characteristics

Chen, Zhou; He, Zhixia; Shang, Weiwei; Duan, Lian; Zhou, Han; Guo, Genmiao; Guan, Wei

doi:10.1016/j.fuel.2018.05.132

Cited by 70 publications

(30 citation statements)

References 28 publications

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“…In addition, the error bars of the macroscopic spray characteristics also contained changes in the angle of inclination of the fuel sprays central axis against the geometrical axis of the nozzle hole 50 . The angle changes depended on cavitation and were affected by fuel properties 49,51 .…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Assessing fuel properties effects of 2,5-dimethylfuran on microscopic and macroscopic characteristics of oxygenated fuel/diesel blends spray

Zhang

Chen

et al. 2020

Sci Rep

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Abstract2,5-Dimethylfuran (DMF) is a type of attractive sustainable green energy for diesel engines that is designed to reduce soot emission. This study investigated the effect of fuel properties on the macroscopic and microscopic spray characteristics of four test blends under injection pressures of 90, 120 and 150 MPa and ambient pressure of 5 MPa in a common diesel rail injection system. The macroscopic results indicate that with higher density, lower viscosity and lower latent heating of DMF20, the spray tip penetration and spray area are increased and the average spray angle is slightly increased. Interestingly, the effect of latent heating on the average spray angle is more obvious than that of kinematic viscosity. The microscopic results suggest that higher density, lower viscosity and lower latent heating of DMF20 have an adverse effect on the breakup of small droplets. The results of comparative analysis show that the change rules of the spray parameters remain nearly unchanged with increased injection pressure, and the influence of DMF20 properties produces a different change in different spray parameters with increasing injection pressure. The meaningful conclusion is that the properties of DMF are favourable to improvement of the spray and atomization parameters under high injection pressure.

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Section: Experimental Setup and Methodsmentioning

confidence: 99%

Assessing fuel properties effects of 2,5-dimethylfuran on microscopic and macroscopic characteristics of oxygenated fuel/diesel blends spray

Zhang

Chen

et al. 2020

Sci Rep

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“…4 (a) at the time of needle closing are shown in Fig. 4 (b), where the black areas with the nozzles are caused by string cavitation [8,24] or geometry cavitation [9,10,25]. In other words, in terms of inclined-hole nozzles, different NL max could lead to different internal flow characteristics, which could bring an important influence on subsequent spray evolution.…”

Section: Needle Lift Movementmentioning

confidence: 99%

“…The effect of nozzle geometry (such as conicity, inlet rounding, nozzle hole numbers) on mixture formation and combustion of the diesel spray has also been an interest field to the research community and the automotive manufacturer [7]. In addition, the cavitation inside the nozzle could bring a significant influence on Diesel spray development, as well as combustion process, which has also been investigated a lot in recent years in order to control the spray actively [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Optical study on needle lift and its effects on reacting diesel sprays of a single hole solenoid injector

Xuan

Sun

et al. 2021

Therm sci

Self Cite

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Precise control of needle lift provides one possibility to control the Diesel spray and combustion process actively. However, most studies of needle lift focus on internal flow or near nozzle spray. Little work has been performed on its effects on reacting spray. In this work, one way to change the needle lift profile of a solenoid injector has been developed and the relationship between needle lift and reacting spray has been investigated. The needle movement was detected with an optical nozzle. In addition, the visualization of reacting sprays of the same injector equipped with a single-hole nozzle was conducted in a combustion chamber. Some simulations were also performed to assist the analysis. The results show that the needle lift profile can be regulated by changing the thickness of an adjusting pad. It seems the different needle lift profiles do not bring in significant influences on reacting spray characteristics. The CFD results indicate that it is mainly caused by the similar internal flow characteristics which do not show strong variation when needle lift is higher than 0.1 mm. However, the discharge coefficient and velocity coefficient decrease sharply when needle lift is smaller than 0.05 mm because of the ?throttle? effect.

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“…Nozzle geometry is one of the parameters on which the quality of atomization of the fuel in the diesel engine depends [109][110][111][112]. In fact, the effectiveness of the combustion and performance of a compression ignition diesel engine depends on the nozzle geometry [113,114].…”

Section: Nozzle Geometrymentioning

confidence: 99%

“…Nozzle Geometry Improved performance with small hole diameter but worsened NOx [107,[109][110][111][112] Strategies for NOx reduction i) Using nano additive [113] ii) modified nozzle configuration [114] Split Injection NOx worsened [124] Strategies for NOx reduction i) By advanced injection [99,126] ii) By triple injection [125,127] iii) By EGR [128] Solenoid Injector Better performance [142] Lack of literature thus potential area to work Piston Bowl Improved performance by RTPBG [148] piston bowl modifications needs to be tested along with different fuel injection strategies…”

Section: Fuel Injectionmentioning

confidence: 99%

A Review of Performance-Enhancing Innovative Modifications in Biodiesel Engines

Khan

2020

Energies

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The ever-increasing demand for transport is sustained by internal combustion (IC) engines. The demand for transport energy is large and continuously increasing across the globe. Though there are few alternative options emerging that may eliminate the IC engine, they are in a developing stage, meaning the burden of transportation has to be borne by IC engines until at least the near future. Hence, IC engines continue to be the prime mechanism to sustain transportation in general. However, the scarcity of fossil fuels and its rising prices have forced nations to look for alternate fuels. Biodiesel has been emerged as the replacement of diesel as fuel for diesel engines. The use of biodiesel in the existing diesel engine is not that efficient when it is compared with diesel run engine. Therefore, the biodiesel engine must be suitably improved in its design and developments pertaining to the intake manifold, fuel injection system, combustion chamber and exhaust manifold to get the maximum power output, improved brake thermal efficiency with reduced fuel consumption and exhaust emissions that are compatible with international standards. This paper reviews the efforts put by different researchers in modifying the engine components and systems to develop a diesel engine run on biodiesel for better performance, progressive combustion and improved emissions.

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Experimental study on the effect of nozzle geometry on string cavitation in real-size optical diesel nozzles and spray characteristics

Cited by 70 publications

References 28 publications

Assessing fuel properties effects of 2,5-dimethylfuran on microscopic and macroscopic characteristics of oxygenated fuel/diesel blends spray

Assessing fuel properties effects of 2,5-dimethylfuran on microscopic and macroscopic characteristics of oxygenated fuel/diesel blends spray

Optical study on needle lift and its effects on reacting diesel sprays of a single hole solenoid injector

A Review of Performance-Enhancing Innovative Modifications in Biodiesel Engines

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