Effects of cavitation in common-rail diesel nozzles on the mixing process

López, J. Javier; Garza, Oscar A. de la; Morena, Joaquín De la; Martínez-Martínez, Simón

doi:10.1177/1468087417697759

Cited by 12 publications

(3 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Payri et al [12] investigated the internal flow in a transparent nozzle under cavitating conditions using an optical experimental system with a charge-coupled device (CCD) camera, and the results showed that the cavitation occurs before the mass flow collapse that takes place once the cavitation is fully developed through the whole orifice. Lopez et al [13] experimentally analyzed the effect of cavitation on the mixing process in nozzles and stated that the increment of the spray cone angle caused by the cavitation leads to a better mixing process. An optical experiment was carried out by He et al [14], and the bubble "suction" from orifice exit at the end of injection and the bubble "discharge" at the initial stage of the next injection were observed.…”

Section: Introductionmentioning

confidence: 99%

Research on the Dynamic Cavitation Flow Characteristics in the Control Valve Region During the Opening Process of the Valve in an Electronic Unit Pump

Liang

Liu

et al. 2020

IEEE Access

View full text Add to dashboard Cite

In this paper, the dynamic evolution of cavitation flow in the solenoid valve area and the flow coefficients during the opening process of the valve in an electronic unit pump (EUP) are studied. Firstly, the pressures of high-pressure fuel and low-pressure fuel, the displacement curve of the control valve, and the flow image in the EUP in the period are obtained by an optical experiment. Then, setting the test results as the boundary conditions, a transient CFD simulation of cavitation flow in the valve region during the opening process including rebounds is carried out using dynamic mesh technology. Then the evolution and forming mechanism of cavitation during the process are analyzed. Cavitation is affected by the jet from the valve port which varies with the pressure differential, the geometry of the domain and the movement of the valve. By comparing with the mass flow rate, velocity coefficient, area coefficient and flow coefficient under conditions without cavitation and without rebound, it is found that cavitation can increase the velocity of the fuel, but significantly reduce the effective flow area, which finally affects the flow capacity of the EUP.INDEX TERMS Cavitation, CFD, flow characteristic, control valve, electronic unit pump.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on the Dynamic Cavitation Flow Characteristics in the Control Valve Region During the Opening Process of the Valve in an Electronic Unit Pump

Liang

Liu

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Therefore, many researchers have carried out a lot of research work around the structural parameters of electronic fuel injector. [12][13][14][15][16][17][18][19][20] These studies focus on the nozzle area. The effect of nozzle hole arrangements and structural parameters on the performance of the electronic fuel injector is discussed.…”

Section: Introductionmentioning

confidence: 99%

Study on the sensitivity of the hydraulic response characteristics of the electronic fuel injector regarding the key structural parameters

Feng

Wang

et al. 2019

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The sensitivity of key structural parameters to the hydraulic response characteristics in an electronic fuel injector is investigated. First, the hydraulic response characteristic is defined in detail (the opening/closing delay and the opening/closing time). Second, the key structural parameters influencing the hydraulic response characteristics are derived. Finally, the importance and effects of key structural parameters on hydraulic response characteristics are examined, by using the design of experiments method and the range analysis. Results show that the fuel inlet passage diameter is the primary influencing factor to the opening delay and closing delay, while the control piston diameter has the dominant effect on opening time and closing time. A small opening delay and a small opening time prefer a little fuel inlet passage diameter and control piston diameter; however, they contribute to a large closing time and closing delay. The fuel outlet passage diameter is the secondary influencing factor in opening delay, but the second factor that affects the opening time is the diameter of needle.

show abstract

“…The cone angle can be defined as the angle formed by two straight lines that start from the outlet hole at the nozzle and they are tangent to the spray contour. If the cone angle is greater, the air engulfing and mixing processes are better [16,19,20].…”

Section: Introductionmentioning

confidence: 99%

Automatic macroscopic characterization of diesel sprays by means of a new image processing algorithm

Rubio-Gómez¹,

Martínez-Martínez²,

Rua-Mojica³

et al. 2018

Meas. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

A novel algorithm is proposed for the automatic segmentation of diesel spray images and the calculation of their macroscopic parameters. The algorithm automatically detects each spray present in an image, and therefore it is able to work with diesel injectors with a different number of nozzle holes without any modification. The main characteristic of the algorithm is that it splits each spray into three different regions and then segments each one with an individually calculated binarization threshold. Each threshold level is calculated from the analysis of a representative luminosity profile of each region. This approach makes it robust to irregular light distribution along a single spray and between different sprays of an image. Once the sprays are segmented, the macroscopic parameters of each one are calculated. The algorithm is tested with two sets of diesel spray images taken under normal and irregular illumination setups.

show abstract

Effects of cavitation in common-rail diesel nozzles on the mixing process

Cited by 12 publications

References 60 publications

Research on the Dynamic Cavitation Flow Characteristics in the Control Valve Region During the Opening Process of the Valve in an Electronic Unit Pump

Research on the Dynamic Cavitation Flow Characteristics in the Control Valve Region During the Opening Process of the Valve in an Electronic Unit Pump

Study on the sensitivity of the hydraulic response characteristics of the electronic fuel injector regarding the key structural parameters

Automatic macroscopic characterization of diesel sprays by means of a new image processing algorithm

Contact Info

Product

Resources

About