Ultra high speed investigation of gaseous jet injected by a single-hole injector and proposing of an analytical method for pressure loss prediction during transient injection

Hajialimohammadi, Alireza; Edgington-Mitchell, Daniel; Honnery, Damon; Montazerin, Nader; Abdullah, Amir; Mirsalim, Mojtaba

doi:10.1016/j.fuel.2016.06.112

Cited by 23 publications

(7 citation statements)

References 25 publications

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“…The validity of this model has been demonstrated for highly underexpanded jets with pressure ratio of up to 70, unaffected by the barrel-shaped shock. This model, described by Equations (4) and (5) [110,111], assumes a constant momentum discharge rate and density during the injection, as well as self-similar jet velocity and mixing distribution. Since the underexpanded jet flow is choked, the nozzle exit velocity (subscript e) is assumed to be the sonic speed [112].…”

Section: Axial Jet Penetrationmentioning

confidence: 99%

“…In reality, the effective pressure (P eff ) at the nozzle exit is less than the fuel supply reservoir pressure due to the high compressibility of gas flow [113], which is not considered in Equation (4). An estimation of the effective pressure depending on the reservoir pressure, ambient pressure and other gas properties was developed by Hajialimohammadi et al [111] based on the shock tube diaphragm rupture process as described by Equation (7). The effective pressure ratio to the ambient pressure (P eff /P a ) in Equation (7) can be approximated using the Newton-Raphson method.…”

Section: Axial Jet Penetrationmentioning

confidence: 99%

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A Review of Hydrogen Direct Injection for Internal Combustion Engines: Towards Carbon-Free Combustion

et al. 2019

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A paradigm shift towards the utilization of carbon-neutral and low emission fuels is necessary in the internal combustion engine industry to fulfil the carbon emission goals and future legislation requirements in many countries. Hydrogen as an energy carrier and main fuel is a promising option due to its carbon-free content, wide flammability limits and fast flame speeds. For spark-ignited internal combustion engines, utilizing hydrogen direct injection has been proven to achieve high engine power output and efficiency with low emissions. This review provides an overview of the current development and understanding of hydrogen use in internal combustion engines that are usually spark ignited, under various engine operation modes and strategies. This paper then proceeds to outline the gaps in current knowledge, along with better potential strategies and technologies that could be adopted for hydrogen direct injection in the context of compression-ignition engine applications—topics that have not yet been extensively explored to date with hydrogen but have shown advantages with compressed natural gas.

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Section: Axial Jet Penetrationmentioning

confidence: 99%

Section: Axial Jet Penetrationmentioning

confidence: 99%

A Review of Hydrogen Direct Injection for Internal Combustion Engines: Towards Carbon-Free Combustion

et al. 2019

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“…The effects of this barrel-shaped pattern on the downstream flow can be represented by employing the pseudo-diameter concept (Ouellette and Hill 2000). The pressure drop caused by the expansion wave travelling upstream the nozzle (towards the high-pressure side) can be estimated by using the shock tube theory, as reported in Hajialimohammadi et al (2016).…”

Section: Gas Injection Modelmentioning

confidence: 99%

“…This study aims at developing a CFD model to sufficiently represent the processes of the closed cycle of a marine two-stroke engine with direct gaseous fuel injection. To address the previous studies limitations discussed above, the pseudo-diameter concept (Ouellette and Hill 2000) and the one-dimensional shock tube theory (Hajialimohammadi et al 2016) are combined to accurately evaluate the gas jet penetration and the air entrainment. In addition, a novel approach for modelling the gas admission in the engine combustion chamber is developed by appropriately calculating the corresponding source terms in the governing equations.…”

Section: Introductionmentioning

confidence: 99%

CFD modelling and numerical investigation of a large marine two-stroke dual fuel direct injection engine

Yang

Theotokatos

Vassalos

2021

Ships and Offshore Structures

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This study aims at developing a CFD model for large marine two-stroke dual fuel engine with gaseous fuel direct injection at high pressure. For the gaseous fuel, the shock tube theory and the pseudo-diameter concept are employed to model the injection, jet penetration and air entrainment processes, whereas its non-premixed combustion is represented by a steady diffusion flamelet model along with a pilot fuel ignition kernel. Following this model validation, a large marine two-stroke dual fuel engine closed cycle is simulated for both the gas and diesel modes at 75% load, and the involved phenomena are comparatively assessed. The derived results demonstrate that the gas mode combustion takes place in lower maximum temperature and leaner conditions compared to the diesel mode, resulting in lower NOx emissions. This study is expected to benefit the development of future engine designs and the engine settings optimisation for reducing emissions and increasing efficiency.

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“…As the high-pressure gas is injected into the engine combustion chamber, the underexpanded flow near the gas nozzle and the expansion fan navigating toward the high-pressure side inside the gas nozzle are observed, which significantly affects the gas injection and cause entrainment with the ambient mixture. 17,18 Herein, the pseudo-diameter concept 17 and the one-dimensional (1D) shock tube theory are employed to evaluate such effects, as proposed in Hajialimohammadi et al 18 The normal gas injection velocity and the pseudo-diameter are calculated by the following formulas…”

Section: Mathematic Modelsmentioning

confidence: 99%

Parametric investigation of a large two-stroke marine high-pressure direct injection engine by using computational fluid dynamics method

Yang

Theotokatos

Vassalos

2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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This study aims at the parametric investigation of the gas injection system settings of a large marine two-stroke dual fuel engine by using a developed and customized CFD method in the ANSYS Fluent software. The investigated engine injection system parameters include the gas injection timing, the gas injection duration, the gas injector lateral angle, and the gas injector holes number. Based on the comparison of the predicted performance parameters for the closed-cycle processes, the results indicate that the gas injector lateral angle is the most significant parameter that affects the engine power as well as the NO and CO2 emissions. For satisfying the contradictory objectives of retaining the engine power and reducing the NO and CO2 emissions, appropriate design settings for the gas injection are recommended for the investigated engine operation in the gas mode at 75% load.

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Ultra high speed investigation of gaseous jet injected by a single-hole injector and proposing of an analytical method for pressure loss prediction during transient injection

Cited by 23 publications

References 25 publications

A Review of Hydrogen Direct Injection for Internal Combustion Engines: Towards Carbon-Free Combustion

A Review of Hydrogen Direct Injection for Internal Combustion Engines: Towards Carbon-Free Combustion

CFD modelling and numerical investigation of a large marine two-stroke dual fuel direct injection engine

Parametric investigation of a large two-stroke marine high-pressure direct injection engine by using computational fluid dynamics method

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