Experimental investigation of effects of super high injection pressure on diesel spray and induced shock waves characteristics

Jia, Tao-Ming; Yu, Yusong

doi:10.1016/j.expthermflusci.2017.03.026

Cited by 27 publications

(12 citation statements)

References 33 publications

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“…This variation might be due to differences of the shock wave shape in the two ambient gases. As the sprays under SF 6 had a bigger Mach number, an "oblique" shaped shock wave should appear at the spray front (Jia et al, 2017), which affects the density near the shock wave in a different way than "spherical" shaped shock waves (Anderson Jr., 2002). On the contrary, jets under subsonic state in different ambient gases (CO 2 and N 2 ) did not show major differences in the spray penetration, regardless of the difference in Mach number values.…”

Section: Resultsmentioning

confidence: 99%

“…They affirmed that a leading edge shock wave is generated after the spray exited the nozzle, followed by multiple shock waves shock waves around the spray body at a later stage. Jia et al (2017) also stated that the morphology of the leading shock wave changed with increasing injection pressure and spray velocity, going from a "spherical shock wave" to an "oblique shock wave". Also, these authors showed that as the injection pressure went higher, the measured spray penetration increased gradually, but its increasing rate decreased.…”

Section: Introductionmentioning

confidence: 99%

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Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

et al. 2018

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In this work, the effect of high injection pressures and ambient gas properties on diesel spray penetration and spreading angle are studied. To this end a multi-hole piezoelectric injector was used, and MIE-Scattering optical technique to visualize the spray. Injection pressures up to 270 MPa were used throughout the experiments. Additionally, the spray behavior going from subsonic to supersonic state was analyzed by controlling the ambient gas speed of sound, promoting in this way supersonic jets. For this purpose, measurements were done using three different ambient gases (SF 6 , CO 2 , and N 2) at isothermal conditions. The results showed that sprays near transonic or in supersonic state had a higher penetration rate than those in subsonic state. Furthermore, among the sprays near transonic or in supersonic state, those with higher Mach number had faster penetration. Differently, within the sprays at subsonic state, no significant variations in spray penetration rate were found, regardless of the difference in the Mach number. Shock waves appearances were pointed out as a possible explanation for the spray penetration variations observed. Finally, a statistical analysis is presented for the spray penetration under isothermal conditions and for each ambient gas.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

et al. 2018

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“…Key applications include ramjets and scramjets [27,28]. In applications such as high-speed diesel injection, shock waves may be induced and interact with the fuel spray [29].…”

Section: Introductionmentioning

confidence: 99%

Shock wave interaction with a transcritical fuel droplet

Boyd

Jarrahbashi

2021

ICLASS

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Shock-droplet interactions occur in a spectrum of high-speed propulsion systems involving liquid fuels. When the combustion chamber pressure is above the critical pressure of the fuel, transcritical behaviour involving the transition from liquid-like to gas-like states is observed. Our understanding of multiphase-shock interaction is significantly less developed than its gasphase counterpart (i.e., shock-bubble interaction) and is particularly limited at transcritical conditions. We consider the interaction of a shockwave with a liquid n-dodecane droplet exposed to a nitrogen environment at a supercritical pressure. A fully-conservative diffuseinterface framework coupled with the Peng-Robinson equation of state is developed to accurately determine the state of the fluid as the shock propagates through the droplet. The shock-droplet interaction results show the development of interfacial instabilities and an axial jet.

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“…Most of these experiments focused on the macroscopic characteristics of atomization (spray angle, breakup length of liquid film, and droplet size distribution) [22][23][24]. Jia et al [25] measured the spray penetration using a high-speed camera and pointed out that the cone angle increased with pressure. Esfarjani and Dolatabadi [26] found that by increasing the aeration level, the mixing between the gas and liquid is enhanced, and the flow structure near the nozzle exit changes from slug flow to co-annular flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

Liu

et al. 2020

Energies

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A two-phase flow ejector is an important part of a water mist fire suppression system, and these devices have become a popular research topic in recent years. This paper proposes a supersonic ejector that aims to improve the efficiency of water mist fire suppression systems. The effects of ejector geometric parameters on the entrainment ratio (ER) were explored. The effects of primary flow pressure (P P ) on the mixing process and flow phenomena were studied by a high-speed camera. The experimental results show that the ER first increases and then decreases with increasing P P . ER increases with increasing ejector area ratio (AR). The P P corresponding to the maximum ER of ejectors with a different nozzle exit position (NXP) is 3.6 bar. The ejector with an NXP of +1 and AR of 6 demonstrate the best performance, and the ER of this ejector reaches 36.29. The spray half-cone angle of the ejector increases with increasing ER, reaching a maximum value of 7.07 • . The unstable atomization half-cone angle is mainly due to a two-phase flow pulsating phenomenon. The pulsation period is 10 ms. In the present study, a general rule that provides a reference for ejector design and selection was obtained through experiments.

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Experimental investigation of effects of super high injection pressure on diesel spray and induced shock waves characteristics

Cited by 27 publications

References 33 publications

Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

Shock wave interaction with a transcritical fuel droplet

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

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