Development of a POD-Based Analysis Approach for Quantitative Comparison of Spray Structure Variations in a Spark-Ignition Direct-Injection Engine

Chen, Hao; Xu, Min; Hung, David L.S.; Yang, Jie; Zhuang, Hanyang

doi:10.4271/2013-01-2545

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…Moreover, several sinks of pressure waves are located inside the jets. As the latter set of snapshots reveals, the number of these sinks increases within the spray as the diffusion flame is completely established, forming the oscillating structure already reported in several works [167,168]. This structure is characterized by opposed amplitude regions along the spray axis as result of an helical 3D oscillation pattern [169,170].…”

Section: Effects Of Turbulence On Combustion Noise Sourcessupporting

confidence: 59%

Computational assessment of combustion noise of automotive compression-ignited engines

Soriano¹

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derstanding the unsteady pressure field inside combustion chambers of compression ignition engines using a CFD approach". International J of Engine Research (available on-line), 2018. I would like to record my sincere gratitude to my advisor Prof. Alberto Broatch for his guidance and support during the chase of this research. A gratitude that also must be extended to Prof. Payri and Prof. Desantes on behalf of CMT-Motores Térmicos and Universitat Politècnica de València for offering me the chance to become part of this research group during these four years. I owe my most special thanks to Prof. Ricardo Novella for his advice and invaluable help in the most difficult moments but especially for the good ones we shared during the fruitless lunchtime discussions, sports sessions... I just can say, moltes gràcies per tot Rick.

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Section: Effects Of Turbulence On Combustion Noise Sourcessupporting

confidence: 59%

Computational assessment of combustion noise of automotive compression-ignited engines

Soriano¹

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“…Probability presence image (PPI) analysis technique was used by Zhong et al 10 to evaluate the cycle-to-cycle variations of pulsing spray characteristics. Chen et al 11 applied proper orthogonal decomposition (POD) analysis approach for quantitative comparison of spray structure variations in engine flows. Wu et al 12 found that flash boiling sprays were more stable than non-flash boiling sprays.…”

Section: Introductionmentioning

confidence: 99%

Investigation on spray cyclic variations under idle operation of engine using optical diagnostics and statistical methods

Zhou

Zhang

et al. 2020

International Journal of Engine Research

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Under idle operations of a spark-ignition direct-injection engine, issues such as misfire, unstable combustion, and power imbalance between individual cylinders are often encountered, which worsen the fuel economy and tailpipe emissions. These undesired phenomena have close relations with cyclic variations of the fuel sprays in the cylinder. In this article, the spray cyclic variations under idle operations have been investigated at a constant volume chamber using ultraviolet/visible laser absorption/scattering imaging technique and Mie scattering optical diagnostics combined with different statistical methods such as probability presence image, intersection over union, and edge fluctuation length. The variations in spray morphology of liquid/vapor phases and vapor mass distributions have been characterized. It was found that the cyclic spray variation after the end of injection is too large to ignore, implying that this cyclic variation should be taken into consideration when matching the spray to a combustion chamber or numerical modeling. The effects of injection pressure and fuel temperature on spray cyclic variations have been quantitatively examined. The results show that the higher injection pressure or the higher fuel temperature is, the larger variation in spray morphology and vapor mass distributions was observed, indicating that adopting an appropriately lower injection pressure or lower fuel temperature is helpful to a stable ignition and combustion under idle conditions for a non-homogeneous spark-ignition direct-injection engine.

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“…As the latter set of snapshots reveal, the number of these sinks increases within the spray as the diffusion flame is completely established, forming the oscillating structure already reported in several works. 84,85 This structure is characterized by opposed amplitude regions along the spray axis as result of a helical 3D oscillation pattern. 86,87 Focusing on the URANS solution, the equivalent instants are slightly different.…”

Section: Effects Of Turbulence On Combustion Noise Sourcesmentioning

confidence: 99%

Investigation of the effects of turbulence modeling on the prediction of compression-ignition combustion unsteadiness

Broatch

Novella

García-Tíscar

et al. 2021

International Journal of Engine Research

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Adverse effects of global warming due to the greenhouse gas emissions is changing the actual paradigm for the use energy resources. In the absence of a mid-term solution for reducing these emissions in transportation, internal combustion (IC) engines are going to coexist in the social spheres in the foreseeable future. Therefore, the study of other IC engine-related problems remains relevant to ensuring the health of the society. In this investigation, a numerical methodology for comprehensive understanding of Noise, Vibration and Harshness in internal combustion engines is proposed. Due to its inherent complexity and lack of awareness, the main objective is to evaluate the impact of the turbulence modeling framework on the in-cylinder acoustic field recreation. Modal decomposition methods have been applied to isolate the coherent flow structures and to analyze how they change with the turbulence approach. Results demonstrate that the choice of the turbulence model is a critical aspect for noise modeling. Unsteady Reynolds-Averaged Navier-Stokes schemes predict a raw estimation of the internal acoustic field with the added value of being computationally less expensive. However, the use of more complex turbulence approaches such us large eddy simulation offers an accurate prediction of the acoustic structures and their cyclic dispersion.

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Development of a POD-Based Analysis Approach for Quantitative Comparison of Spray Structure Variations in a Spark-Ignition Direct-Injection Engine

Cited by 7 publications

References 17 publications

Computational assessment of combustion noise of automotive compression-ignited engines

Computational assessment of combustion noise of automotive compression-ignited engines

Investigation on spray cyclic variations under idle operation of engine using optical diagnostics and statistical methods

Investigation of the effects of turbulence modeling on the prediction of compression-ignition combustion unsteadiness

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