Time resolved characteristics of gaseous jet injected by a group-hole nozzle

Hajialimohammadi, Alireza; Honnery, Damon; Abdullah, Amir; Mirsalim, Mojtaba

doi:10.1016/j.fuel.2013.05.050

Cited by 23 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The necessity of examining various spray characteristics during the test, the 10-time repetition of each test and the high number of images stored in different test modes require an algorithm that can analyze the number of images with high speed and precision., therefore the modified version of the code provided in the (Hajialimohammadi et al 2013 has been developed to analyze the images in MATLAB software.…”

Section: Image Processing Methodsmentioning

confidence: 99%

Experimental Study of the Coking Phenomenon Effects on Spray Characteristics of the High Pressure Diesel Injector

Sheykhvazayefi¹,

Gorji-Bandpy²,

Hajialimohammadi³

et al. 2020

JAFM

View full text Add to dashboard Cite

The novel diesel engines with advanced fuel injection systems are equipped with solenoid injectors comprising multiple small nozzle orifices which makes considerable improvement in fuel spray characteristics and engine performance along with providing high pressure fuel injection system. On the other hand, poor fuel quality, impurities and heavy metal elements in the diesel fuel, and high temperature medium in the diesel engines combustion chamber lead to remarkable deposits formation in the small holes of the nozzle. In addition, it results in partial or complete nozzle hole obstruction which is called injector nozzle coking having detrimental effects on discharged spray ideal behavior and proper engine performance. In this work, the analysis of coking phenomenon influences on diesel spray macroscopic characteristics have been done. Initially, the coked injectors with different time operation and deposit amounts are prepared under experimental and specific operating conditions. Then, the images recorded from the spatial and temporal evolution of a diesel spray in various injection and chamber pressures, are processed through the extended code in MATLAB software in order to analyze discharged fuel spray characteristics. The SCHLIEREN Imaging Method with high speed camera has been utilized in a CVC (constant volume chamber) without combustion. Non-Destructive Electron Microscopy Method of SEM (Scanning Electron Microscope) imaging was utilized in order to analyze sediments quantity and construction changes during injector working in the real engine conditions. The results show that, sediments occupy 20, 40, 75 and 90% of the total hole opening surface, respectively in the injectors with 300, 700, 800 and 900 hours operating time. By increasing the injector operation time and accumulated sediment amount on the nozzle, the discharged injector spray exhibits a more inappropriate behavior. Moreover, The Results revealed that coking has considerable effects on the spray tip penetration at low injection pressures. As injection pressure increases, the decreasing rate of the penetration length alleviates gently. In other words, at high injection pressures (1500 bar and higher) the penetration length has minor drop compared with non-utilized injectors even at 900 hours operating time, but the spray projected area can be reduced up to 28% in high chamber pressures.

show abstract

Section: Image Processing Methodsmentioning

confidence: 99%

Experimental Study of the Coking Phenomenon Effects on Spray Characteristics of the High Pressure Diesel Injector

Sheykhvazayefi¹,

Gorji-Bandpy²,

Hajialimohammadi³

et al. 2020

JAFM

View full text Add to dashboard Cite

show abstract

“…Figure 5 shows the comparison between experimental injection quantity curve and that of simulation, and the results of the injector model at the rail pressure of 1600 bar for twelve energizing times (from 0.25 to 1.1 ms). It should be noted that during injector opening, discharge coefficient increases from very low values to its maximum value and the injector flow rate is not constant in this time, so in this time injector does not behave linearly [13]. This nonlinear behavior continues for a very short time after injector fully open condition due to needle bouncing.…”

Section: Common Rail System Modelmentioning

confidence: 95%

Modeling of pressure line behavior of a common rail diesel engine due to injection and fuel variation

Mohebbi

Aziz

Hamidi

et al. 2016

J Braz. Soc. Mech. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

“…The observation of under-expanded jets can be performed both with quantitative and qualitative techniques. Among the first category, schlieren and shadowgraph imaging surely can be mentioned, adopted for capturing images of both near and far field zones [13,[41][42][43].…”

Section: Experimental Observation Of Under-expanded Jetsmentioning

confidence: 99%

“…Commercially available injectors were also modified to inject gaseous fuels generating multi-hole patterned sprays [13,43,57].…”

Section: Characteristics and Parameters Of The Injectionmentioning

confidence: 99%

“…High-injection pressures are typically used for gaseous fuelling in order to achieve the required mass flow rates and promote air/fuel mixing [11][12][13][14][15][16][17], typically leading to the formation of highly under-expanded jets (UEJ) at the injector outlet, when the fuel jet faces surrounding airflow. Under-expanded jets are complex high-speed flows, which are also formed in many other engineering applications and devices such as exhaust aircraft plumes (rockets and missiles), supersonic combustion chambers, actuators, etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Under-Expanded Jets in Advanced Propulsion Systems—A Review of Latest Theoretical and Experimental Research Activities

Duronio,

Villante,

De Vita

2023

Energies

View full text Add to dashboard Cite

The current ongoing rise in environmental pollution is leading research efforts toward the adoption of propulsion systems powered by gaseous fuels like hydrogen, methane, e-fuels, etc. Although gaseous fuels have been used in several types of propulsion systems, there are still many aspects that can be improved and require further study. For this reason, we considered it important to provide a review of the latest research topics, with a particular focus on the injection process. In advanced engine systems, fuel supply is achieved via enhanced direct injection into the combustion chamber. The latter involves the presence of under-expanded jets. Under-expanded jets are a particular kind of compressible flow. For this reason, the review initially provides a brief physical explanation of them. Next, experimental and numerical CFD investigation techniques are discussed. The last section of this manuscript presents an analysis of the jet’s structure. The injection parameters commonly used are examined; next, the characteristics of the near-nozzle field are reviewed and finally, the far-field turbulent mixing, which strongly affects the air–fuel mixture formation process, is discussed.

show abstract

Time resolved characteristics of gaseous jet injected by a group-hole nozzle

Cited by 23 publications

References 23 publications

Experimental Study of the Coking Phenomenon Effects on Spray Characteristics of the High Pressure Diesel Injector

Experimental Study of the Coking Phenomenon Effects on Spray Characteristics of the High Pressure Diesel Injector

Modeling of pressure line behavior of a common rail diesel engine due to injection and fuel variation

Under-Expanded Jets in Advanced Propulsion Systems—A Review of Latest Theoretical and Experimental Research Activities

Contact Info

Product

Resources

About