A CFD (computational fluid dynamics) study for optimization of gas injector orientation for performance improvement of a dual-fuel diesel engine

Chintala, Venkateswarlu; Subramanian, K.A.

doi:10.1016/j.energy.2013.06.009

Cited by 62 publications

(23 citation statements)

References 29 publications

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“…Since the Reynolds number ranges from 3.038 × 10 5 to 1.044 × 10 6 in the calculations, a realizable -turbulence model [19][20][21][22][23] is employed to close the flow governing equations and describe the turbulent properties:…”

Section: Governingmentioning

confidence: 99%

Numerical Analysis of Flow Erosion on Sand Discharge Pipe in Nitrogen Drilling

Zhu

Lin

Feng

et al. 2013

Advances in Mechanical Engineering

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In nitrogen drilling, entrained sand particles in the gas flow may cause erosive wear on metal surfaces and have a significant effect on the operational life of discharge pipelines, especially for elbows. In this paper, computational fluid dynamics (CFD) simulations based code FLUENT is carried out to investigate the flow erosion on a sand discharge pipe in conjunction with an erosion model. The motion of the continuum phase is captured based on solving the three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations, while the kinematics and trajectory of the sand particles are evaluated by the discrete phase model (DPM). The flow field has been examined in terms of pressure, velocity, and erosion rate profiles along the flow path in the bend of the simulated discharge pipe. Effects of flow parameters such as inlet velocity, sandy volume fraction, and particle diameter and structure parameters such as pipe diameter and bend curvature are analyzed based on a series of numerical simulations. The results show that small pipe diameter or small bend curvature leads to serious erosion, while slow flow, little sandy volume fraction, and small particle diameter can weaken erosion. The results obtained from the present work provide useful guidance to practical operation and discharge pipe design.

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Section: Governingmentioning

confidence: 99%

Numerical Analysis of Flow Erosion on Sand Discharge Pipe in Nitrogen Drilling

Zhu

Lin

Feng

et al. 2013

Advances in Mechanical Engineering

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“…This result is due to that the opposite direction of the holes with the airflow allows the generation of highly turbulent flow with vortices inside the mixer and the mixture of air with gaseous fuel for the longest possible time (Table 6) [54]. Furthermore, increasing the number of holes inside the mixer does not affect the diffusion of gaseous fuel inside the mixer when the direction of the holes is opposite that of the airflow.…”

Section: Uniformity Index Of Gaseous Fuel Inside the New Mixer Modelsmentioning

confidence: 76%

New Design of a CNG-H2-AIR Mixer for Internal Combustion Engines: An Experimental and Numerical Study

et al. 2017

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Several studies have aimed to convert diesel engines to dual-or tri-fuel engines to improve their fuel economy and reduce the emissions from diesel engine, however, most of these studies do not consider enhancing the homogeneity of fuel mixtures inside the engine and accurately controlling the air fuel ratio. In this study, a new air-fuel mixer was designed, manufactured and tested. The proposed air-gaseous fuel mixer design was conceived to be suitable for mixing air with compressed natural gas (CNG) and a blend of hydrogen and compressed natural gas (HCNG) that gives homogenous mixtures with high uniformity index and also to be easily connected with an Electronic Control Unit (ECU) for controlling accurately the air-gaseous fuel ratio for different engine speeds. For optimizing the homogeneity inside the new mixer, fourteen different mixer models were created to investigate the effects of diameter, location, and the number of holes inside the mixer on the homogeneity and distribution of the mixtures. Computational fluid dynamics analysis software was used to check the flow behavior, distribution and homogeneity of mixtures inside the new mixer models. The simulation results revealed that the best uniformity index (UI) values are obtained in model 7 where the UI values are 0.939 and 0.937, respectively, for an air fuel ratio for a blend of hydrogen and compressed natural gas (AFRHCNG) = 51.31 and the air fuel ratio for compressed natural gas (AFRCNG) = 34.15. According to the numerical and experimental results for the new mixer (model 7) under different engine speeds (1000-4000) and air-CNG ratio of 34.15, a meaningful agreement is reached between the experimental and numerical values for AFRCNG (coefficient of determination (R 2 ) = 0.96 and coefficient of variation (CoV) = 0.001494).

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“…The end of injection for H 2 was varied with respect to the H 2 energy share requirement while it kept constant for water. These injection timings were optimized based on better performance and lower emissions for H 2 dual-fuel operation in our earlier study [23].…”

Section: Gas and Water Injection Systemsmentioning

confidence: 99%