An experimental study on the needle valve motion characteristics of high pressure natural gas and diesel co-direct injector

Yang, Xiyu; Dong, Quan; Wang, Xiaoyan; Zhou, Tanqing; Wei, Daijun

doi:10.1016/j.energy.2022.126257

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…Therefore, researchers have explored the feasibility of a natural gas/diesel-integrated dual needle valve injector. The results indicate that the performance of the dual needle valve injector can meet the engine requirements and solve the layout difficulties of dual injectors [27]. Researchers also found that the combustion efficiency is higher in engines with a flat-bottom combustion chamber compared to engines with a hemispherical-shaped combustion chamber.…”

Section: Introductionmentioning

confidence: 88%

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Tian,

Cui,

Xiao

et al. 2023

Processes

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Pilot diesel ignition is an effective approach for achieving efficient and clean combustion of natural gas. In this study, a rapid compression and expansion machine (RCEM) was constructed for examining diesel-ignited premixed methane combustion. The effects of the methane equivalence ratio and pilot diesel mass on the combustion process of diesel-ignited premixed methane gas were investigated. The results show that the combustion process can be divided into two stages: diesel dominance and premixed methane combustion. An increase in the methane equivalence ratio inhibits diesel combustion, leading to delayed CA10 and OH radical generation. However, it enhances premixed methane flame propagation and improves the heat release rate, resulting in a shorter combustion duration. An increase in the pilot diesel mass contributes to a larger flame area and higher OH generation intensity in the ignition region; however, too large a diesel mass inhibits methane flame propagation towards the diesel nozzle due to an extended injection duration. In conclusion, a larger pilot diesel mass can achieve better overall combustion performance, but excessive amounts may be counterproductive.

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Section: Introductionmentioning

confidence: 88%

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Tian,

Cui,

Xiao

et al. 2023

Processes

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“…Based on the identification of the high and low frequencies of pressure fluctuations, these trends can theoretically support studies of cavitation characterization. Yang et al [4] proposed a novel, non-invasive method of measuring needle valve motion to examine the effect of needle valve motion on the injector's injection rate. The findings demonstrated that the injection rate is not linearly related to changes in the spool position and that the spool's lifting speed varies as gas injection pressure changes.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann Simulation of Cavitating Flow in a Two-Dimensional Nozzle with Moving Needle Valve

Yang,

Dai,

Jin

2024

Processes

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A cascaded pseudo-potential lattice Boltzmann model and refilling algorithms for moving boundary treatment were used to simulate the large density ratio cavitating flow in a two-dimensional nozzle with the periodic motion of the needle valve. The relationships between density variation at the cavitation zone, the evolution of force acting on the lower boundary of the sack wall region, and the surface of the needle valve with time under different needle valve motion frequencies were obtained. The results indicate that the inception and evolution of cavitation mainly exist in the vicinity of the lower boundary of the sack wall region. The density at cavitation decreases by approximately three orders of magnitude, while the force on the lower boundary of the sack wall region decreases by about one order of magnitude. Since cavitation does not exist in the vicinity of the needle valve, the forces are mainly influenced by the periodic motion of the needle valve and do not change significantly. Changes in the frequency of needle valve motion affect the time taken for cavitation evolution to reach a relatively steady state but do not significantly affect the forces acting on the different components.

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Hydrogen use in high-efficiency compression ignition engines

McTaggart-Cowan,

Farzam,

Safavi

2024

Hydrogen Energy Conversion and Management

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An experimental study on the needle valve motion characteristics of high pressure natural gas and diesel co-direct injector

Cited by 7 publications

References 14 publications

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Lattice Boltzmann Simulation of Cavitating Flow in a Two-Dimensional Nozzle with Moving Needle Valve

Hydrogen use in high-efficiency compression ignition engines

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