Numerical Investigation of Fluid Flow and In-Cylinder Air Flow Characteristics for Higher Viscosity Fuel Applications

Hamid, M. F.; Idroas, Mohamad Yusof; Sa’ad, Shukriwani; Teoh, Yew Heng; Mat, Sharzali Che; Alauddin, Zainal Alimuddin Zainal; Shamsuddin, Khairul Akmal; Shuib, Raa Khimi; Abdullah, Moha Asri

doi:10.3390/pr8040439

Cited by 11 publications

(12 citation statements)

References 37 publications

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“…In order to enhance the turbulence intensity, the vortex flow needs to be increased [39]. Nevertheless, the flow structure changes dramatically along the cylinder (due to change in geometry at the intake stroke) influenced by the engine geometry as reported by Hamid et al [40,41]. Thus, as is clearly seen in Figure 11, a progressive airflow was achieved and demonstrated via the installation of the 0.60R GVD design.…”

Section: Swirl Tumble and Cross Tumble Ratio (R S R T And R Ct )mentioning

confidence: 85%

Numerical Investigation of the Characteristics of the In-Cylinder Air Flow in a Compression-Ignition Engine for the Application of Emulsified Biofuels

et al. 2020

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This paper presents a numerical analysis of the application of emulsified biofuel (EB) to diesel engines. The study performs a numerical study of three different guide vane designs (GVD) that are incorporated with a shallow depth re-entrance combustion chamber (SCC) piston. The GVD variables were used in three GVD models with different vane heights, that is, 0.2, 0.4 and 0.6 times the radius of the intake runner (R) and these were named 0.20R, 0.40R and 0.60R. The SCC piston and GVD model were designed using SolidWorks 2017, while ANSYS Fluent version 15 was used to perform cold flow engine 3D analysis. The results of the numerical study showed that 0.60R is the optimum guide vane height, as the turbulence kinetic energy (TKE), swirl ratio (Rs), tumble ratio (RT) and cross tumble ratio (RCT) in the fuel injection region improved from the crank angle before the start of injection (SOI) and start of combustion (SOC). This is essential to break up the heavier-fuel molecules of EB so that they mix with the surrounding air, which eventually improves the engine performance.

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Section: Swirl Tumble and Cross Tumble Ratio (R S R T And R Ct )mentioning

confidence: 85%

Numerical Investigation of the Characteristics of the In-Cylinder Air Flow in a Compression-Ignition Engine for the Application of Emulsified Biofuels

et al. 2020

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“…Fluid shear stresses and wall friction degrades the swirl and tumble kinetic energies [22]. The resulting shear torques τ z,shr and τ x,shr can be determined by integrating the wall friction over the chamber surface and fluid stress over the chamber volume but would require knowledge of the spatial flow field.…”

Section: Evolutions Mech Engmentioning

confidence: 99%

Internal Combustion Engine Modeling Framework in Simulink: Combustion Modeling

Yoon

2022

EME

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An internal combustion engine modeling framework has been developed in the MATLAB/Simulink environment to allow engine component blocks to be connected in a physically representative manner to reduce the model build time. Each component block, derived from physical laws, interacts with other blocks according to block connection. In this series paper, detailed combustion modeling is presented among several engine subsystems. In the engine modeling framework, combustion is represented by a spherical flame propagating from the spark plug, and the burn rate is correlated to combustion chamber geometry, laminar flame speed, and turbulence. To accurately predict the burn rate, the quasi-dimensional model requires tuning. The combustion model has been computationally validated in a previous study and will be experimentally validated with real engine test data in the next series paper.

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“…Nevertheless, R CT has a close correlation with R s and R T . Bari et al found that in order to improve R CT in a CI engine, R s and R T values need to be improved [41,42]. Prasad et al reported that enhancing the R CT air motion is a crucial issue, as it has an impact on increasing the air-fuel mixing process, achieving faster burning rates, increasing indicated efficiency, and improving the air management [43].…”

Section: In-cylinder Swirl (R S ) Tumble (R T ) and Cross Tumble Ratio (R Ct )mentioning

confidence: 99%

Numerical Investigation of the Effect of Incorporated Guide Vane Length with SCC Piston for High-Viscosity Fuel Applications

et al. 2020

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Compression ignition (CI) engines that run on high-viscosity fuels (HVF) like emulsified biofuels generally demonstrate poor engine performance. An engine with a consistently low performance, in the long run, will have a negative effect on its lifespan. Poor combustion in engines occurs mainly due to the production of less volatile, less flammable, denser, and heavier molecules of HVF during injection. This paper proposes a guide vane design (GVD) to be installed at the intake manifold, which is incorporated with a shallow depth re-entrance combustion chamber (SCC) piston. This minor modification will be advantageous in improving the evaporation, diffusion, and combustion processes in the engine to further enhance its performance. The CAD models of the GVD and SCC piston were designed using SolidWorks 2018 while the flow run analysis of the cold flow CI engine was conducted using ANSYS Fluent Version 15. In this study, five designs of the GVD with varying lengths of the vanes from 0.6D (L) to 3.0D (L) were numerically evaluated. The GVD design with 0.6D (L) demonstrated improved turbulence kinetic energy (TKE) as well as swirl (Rs), tumble (RT), and cross tumble (RCT) ratios in the fuel-injected zone compared to other designs. The suggested improvements in the design would enhance the in-cylinder airflow characteristics and would be able to break up the penetration length of injection to mix in the wider area of the piston-bowl.

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Numerical Investigation of Fluid Flow and In-Cylinder Air Flow Characteristics for Higher Viscosity Fuel Applications

Cited by 11 publications

References 37 publications

Numerical Investigation of the Characteristics of the In-Cylinder Air Flow in a Compression-Ignition Engine for the Application of Emulsified Biofuels

Numerical Investigation of the Characteristics of the In-Cylinder Air Flow in a Compression-Ignition Engine for the Application of Emulsified Biofuels

Internal Combustion Engine Modeling Framework in Simulink: Combustion Modeling

Numerical Investigation of the Effect of Incorporated Guide Vane Length with SCC Piston for High-Viscosity Fuel Applications

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