Injection characteristics of gaseous jet injected by a single-hole nozzle direct injector

Erfan, Iman; Chitsaz, Iman; Ziabasharhagh, Masoud; Hajialimohammadi, Alireza; Fleck, Brian A.

doi:10.1016/j.fuel.2015.07.037

Cited by 37 publications

(8 citation statements)

References 26 publications

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“…Then, the absolute values of the differences between the background images and the jet images were calculated. After a 3×3 pixel median filtering was implemented to improve the signalto-noise ratio (SNR), the Canny edge detection algorithm was employed to detect the jet boundary [31]. This algorithm is based on finding the local maximum of intensity gradient in the jet image, and it enables to distinguish unclear edges.…”

Section: Image Processing and Definitions Of Jet Characteristicsmentioning

confidence: 99%

Injection characteristics and fuel-air mixing process of ammonia jets in a constant volume vessel

Zhang

Chen

Wang

et al. 2021

Fuel

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Section: Image Processing and Definitions Of Jet Characteristicsmentioning

confidence: 99%

Injection characteristics and fuel-air mixing process of ammonia jets in a constant volume vessel

Zhang

Chen

Wang

et al. 2021

Fuel

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“…In Port Fuel Injection, CNG and air are mixed before entering the cylinder, whereas for Direct Injection CNG is injected directly into the cylinder. CNG DI leads to higher volumetric efficiency and power output than PFI for a given engine displacement [5][6][7]. To achieve sufficient mass flow rate and fast air/fuel mixing, CNG DI requires higher rail pressures [8], typically from 16 to 20 bar compared to 2 to 10 bar for PFI [9,10].…”

Section: Introductionmentioning

confidence: 99%

Large-eddy simulation of methane direct injection using the full injector geometry

Yosri

Meulemans

et al. 2021

Fuel

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Understanding the mixing process of under-expanded gaseous-fuel jets from an outward opening injector is essential for developing Direct Injection (DI) internal combustion engines. This paper presents a Large-Eddy Simulation (LES) study of the DI of methane into a Constant Volume Chamber (CVC), considering the full, internal geometry of a prototype injector. Four cases at conditions relevant to Compressed Natural Gas (CNG) DI engines are investigated, with methane as a surrogate for CNG. A new post-processing method permits the 3D LES field to be projected into a 2D density gradient field that can be compared to a schlieren image. The LES results are then validated against high-speed, schlieren imaging experiments, demonstrating that the simulations are able to reproduce experimental trends. Three main regions of the external flow are observed: a recirculation zone just downstream of the injector tip, a stagnation zone and a far-mixing zone. The location of the stagnation zone increases as the CVC pressure decreases, consistent with a theory presented in the literature.The modelling of the full internal geometry of the injector leads to a determination of the injector pressure losses. Once the pressure loss within the injector is considered, a short version of the injector can reasonably represent the full injector for prediction of the external flow.

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“…The combustion limit of the NG direct injection is impressed on injection timing and injection duration. Injector and injection characteristics are dominant parameters for achieving effective combustion in direct injection SI engines . To the stratified charge engine, NG is injected with a proper injection timing at the late of compression stroke to assist the engine to have steady operation at a very lean overall blending .…”

Section: Introductionmentioning

confidence: 99%

Investigation of multistage injection strategies in a DISI engine fueled with methane under stratified charge lean combustion conditions

Fırat

2020

Env Prog and Sustain Energy

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A three‐dimensional numerical study has been performed to study combustion and emission of methane in a stratified charge direct injection spark ignition engines under the multistage injection strategies. Firstly, the combustion and emission characteristics of a single‐injection strategy were investigated, and then the effects of two‐stage and three‐stage injection strategies of the injected fuel on combustion and emissions were analyzed. This simulation was run from intake valve opening to exhaust valve opening under stratified charge conditions using the ANSYS Forte numerical software. The Discrete Particle Ignition Kernel Flame model was used to investigate the ignition process and also the combustion and flame propagation were simulated with the G‐equation model. The numerical results show that the multistage injection strategies achieve a significant improvement in the cylinder pressure and combustion efficiency, while reducing NOx, CO, and unburned hydrocarbon emissions compared to single‐injection strategy under stratified charge conditions. Also, the efficient multistage injection strategies enhanced the benefits of the emission reduction in the stratified lean combustion with additional increases of combustion efficient.

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Injection characteristics of gaseous jet injected by a single-hole nozzle direct injector

Cited by 37 publications

References 26 publications

Injection characteristics and fuel-air mixing process of ammonia jets in a constant volume vessel

Injection characteristics and fuel-air mixing process of ammonia jets in a constant volume vessel

Large-eddy simulation of methane direct injection using the full injector geometry

Investigation of multistage injection strategies in a DISI engine fueled with methane under stratified charge lean combustion conditions

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