Combustion and Particulate Matter Emission Characteristics for Diesel Engine Run by Partially-Premixed Low-Temperature Combustion Mode

Liu, Bei; Cheng, Xiaobei; Liu, Jialu; Han, Pu; Li, Yi

doi:10.4271/2017-01-2398

Cited by 9 publications

(4 citation statements)

References 55 publications

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“…35 Figure 12 in Supplemental Appendix A1 depicts that a high premixed combustion ratio is obtained with a late injection timing of 4° CA BTDC because combustion occurs mainly during the expansion stroke. This is consistent with the findings, 8,36–38 which show that the premixed combustion peak of heat release rate initially reduces as fuel injection timings advance and then displays an increasing trend at excessively early SOI timing.…”

Section: Resultssupporting

confidence: 92%

An experimental investigation into the combustion stability and emissions of an n-butanol/diesel blended fueled partially premixed compression ignition (PPCI) engine

Kumar

Sandhu

2022

International Journal of Engine Research

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Higher cyclic variability in internal combustion engines (ICE) increases driveability problems, specific fuel consumption, and exhaust emissions. Consequently, quantification of the combustion stability in different combustion parameters is essential for the design of closed-loop control for a partially premixed combustion (PPC). This research examines the impacts of a PPC strategy on the spectral features of IMEP combustion parameters for early, and late injection timings of a 4-cylinder CRDI engine using wavelet transforms (WT). Furthermore, operating points were optimized based on the combustion and emissions characteristics of the partially premixed compression ignition engine. Results indicated that the early start of injection (SOI) timing of 12° CA BTDC has a lower standard deviation in the time-series data of IMEP than the late SOI timing. Moreover, when the amount of n-butanol in diesel fuel was increased from 0% to 20% at a load of 2 bar BMEP, COVIMEP decreased from 3.1% to 2.75% at early SOI timing. The WT results reveal that the continuous strong intensity band pattern changes irregularly when the injection timing is advanced. It was also found that at lower cyclic variability conditions (SOI = 12°CA BTDC), CO and smoke emissions decreased, and there was a noticeable increase in NOx emissions.

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Section: Resultssupporting

confidence: 92%

An experimental investigation into the combustion stability and emissions of an n-butanol/diesel blended fueled partially premixed compression ignition (PPCI) engine

Kumar

Sandhu

2022

International Journal of Engine Research

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“…The velocity time series of the core position of the backflow zone behind the bluff body and the points at the shear layer were tested during the calculation process, and a spectral analysis was performed. The slope of the red line in Figure 3 was −5/3, and the spectral curve reflected Kolmogorov's −5/3 power law, thus demonstrating that the mesh size satisfied the basic LES calculation conditions [32]. Consequently, for both stable and unsteady calculations, a mesh with 3.4 million nodes was selected in this study.…”

Section: Meshingmentioning

confidence: 77%

Numerical Simulation Study on the Dynamics of Bluff-Body Flames under Oxygen-Lean Conditions

Deng,

Zhao,

Qin

et al. 2023

Energies

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As modern aeroengine combustors advance towards high temperatures, afterburners are inevitably affected by diminished oxygen content in incoming flows, thus affecting combustion efficiency, instability, and flammability limits. In this study, the dynamic combustion characteristics of V-shaped bluff body-stabilised diffusion flames were investigated using a large eddy simulation method with an oxygen mass fraction range of 14–23% and temperatures ranging from 900 to 1100 K. The results show the significant effects of oxygen content and inflow temperature on the flame/flow behaviours downstream of the bluff-body flame holder. In a separated shear layer, two distinct modes of flow/flame shedding are observed when varying the oxygen content and inflow temperature. The results show that BVK instability governs the far-field wake flow/flame features, whereas the oxygen concentration and temperature significantly affect their oscillation amplitudes. In addition, variations in the incoming oxygen content and temperature shift the axial position of the transition from KH instability to BVK instability. Finally, a spectral analysis is conducted to investigate the characteristics of pressure and heat release pulsations under different scenarios. This study highlights the importance of oxygen content on the combustion dynamics of bluff body-stabilised diffusion flames at various temperatures, which is essential for optimising combustion efficiency and stability in practical applications.

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“…The velocity time series in the core region of the recirculation zone behind the bluff body and in the shear layer were analysed spectrally. The spectral curves in Figure 3 reflect Kolmogorov's −5/3 power law, indicating that the setup mesh size meets the requirements of the LES simulation [42]. Therefore, a mesh of 3.4 million nodes was chosen in this study for stable and unstable calculations.…”

Section: Meshingmentioning

confidence: 99%

Exploring Vortex–Flame Interactions and Combustion Dynamics in Bluff Body-Stabilized Diffusion Flames: Effects of Incoming Flow Velocity and Oxygen Content

Chen,

Zhao,

Wang

et al. 2024

Processes

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An afterburner encounters two primary features: high incoming flow velocity and low oxygen concentration in the incoming airflow, which pose substantial challenges and contribute significantly to the deterioration of combustion performance. In order to research the influence of oxygen content on the dynamic combustion characteristics of the afterburner under various inlet velocities, the effect of oxygen content (14–23%) on the field structure of reacting bluff body flow, flame morphology, temperature pulsation, and pressure pulsation of the afterburner at different incoming flow velocities (0.1–0.2 Ma) was investigated in this study by using a large eddy simulation method. The results show that two different instability features, BVK instability and KH instability, are observed in the separated shear layer and wake, and are influenced by changes in the O2 mass fraction and Mach number. The oxygen content and velocity affected the oscillation amplitude of the downstream flow. As the O2 mass fraction decreases, the flame oscillation amplitude increases, the OH concentration in the combustion chamber decreases, and the flame temperature decreases. Additionally, the amplitude of the temperature pulsation in the bluff body flame was primarily influenced by the temperature intensity of the flame and BVK instability. Moreover, the pressure pulsation is predominantly affected by the dynamic characteristics of the flow field behind the bluff body. When the BVK instability dominated, the primary frequency of the pressure pulsation aligned with that of the temperature pulsation. Conversely, under the dominance of the KH instability, the temperature pulsation did not exhibit a distinct main frequency. At present, the influence of oxygen content and incoming flow rate on the combustion performance of the combustion chamber is not clear. The study of the effect of oxygen content on the combustion characteristics of the combustion chamber at different incoming flow rates provides a reference for improving the performance of the combustion chamber and enhancing the combustion stability.

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Combustion and Particulate Matter Emission Characteristics for Diesel Engine Run by Partially-Premixed Low-Temperature Combustion Mode

Cited by 9 publications

References 55 publications

An experimental investigation into the combustion stability and emissions of an n-butanol/diesel blended fueled partially premixed compression ignition (PPCI) engine

An experimental investigation into the combustion stability and emissions of an n-butanol/diesel blended fueled partially premixed compression ignition (PPCI) engine

Numerical Simulation Study on the Dynamics of Bluff-Body Flames under Oxygen-Lean Conditions

Exploring Vortex–Flame Interactions and Combustion Dynamics in Bluff Body-Stabilized Diffusion Flames: Effects of Incoming Flow Velocity and Oxygen Content

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