Numerical study on prediction of icing phenomena in intake system of diesel engine: Operating conditions with low-to-middle velocity of inlet air

Yoon, Wonjun; Kim, Jong-Hyun; Chung, Chungsoo; Park, Jungsoo

doi:10.1016/j.energy.2022.123569

Cited by 6 publications

(7 citation statements)

References 20 publications

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“…On the other hand, the problem of condensation due to LP EGR usage has been known for a long time, but the academic approach has recently become increasingly important as field issues with condensation have arisen accompanying icing problems in engine system. There are a few studies that have linked academic results on condensation and icing in automobile engines to field issues, and the study by Yoon et al provided almost the only results that correspond to the study prior to this study [28]. Yoon et al studied the amount of ice generated when blow-by gas (BB) mixed with HP EGR and LP EGR meets sub-zero air in a low-and middle-velocity region in the intake system.…”

Section: Introductionmentioning

confidence: 91%

“…Xbb is expressed in terms of the amount of mbb/total mixed gas, considering that some of the cylinder gas escapes to the BB. A detailed explanation of the mass balance equation and CFD modeling can be found in the previous paper [28]. Table 1 represents the target engine specifications for this study.…”

Section: Mass Balance Equationsmentioning

confidence: 99%

“…The calculation time reflected the actual driving time of 30 min, and the value of the analyzed result was adopted for the FENSAP-Droplet and ICE. The FENSAP-Droplet and ICE processes are described in our previous published paper [28].…”

Section: Geometry Modelingmentioning

confidence: 99%

“…result was adopted for the FENSAP-Droplet and ICE. The FENSAP-Droplet and ICE processes are described in our previous published paper [28].…”

Section: Tunnel Test With Chassis Dynamometermentioning

confidence: 99%

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Numerical Study on Prediction of Icing Phenomena in Fresh Air and Blow-by Gas Mixing Region of Diesel Engine under High Velocity of Intake Air Condition

Yoon,

Lee,

Park

2024

Energies

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The icing of an intake pipe that might happen in an actual vehicle was numerically predicted in this study. For various operating conditions, the amount of icing was estimated, and the variables influencing the amount of icing were identified. We compared the factors that affected icing: relative humidity, air temperature, and inlet velocity. Seven RPM and load conditions, an intake temperature range of 253–268 K, and a relative humidity range of 65–85% were used for the case studies. To verify the model accuracy, wind tunnel test results from chassis dynometer tests were compared to the data from simulations. The flow analysis was performed using the numerical analytical tool ANSYS Fluent (2019 R1), while the amount of condensed water and icing was predicted using FENSAP-ICE, a program that analyzes and predicts icing phenomena under mechanical systems. The ambient temperature, relative humidity, and inlet air velocity had the biggest effects on the icing rate. The total amount of icing increased for similar BB and input air velocities. When the input air and BB velocities are the same, the variables influencing icing are the ambient temperature and relative humidity. The amount of ice was less affected by outside temperature and relative humidity when the rpm was high, and the inlet air velocity also had an impact.

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Section: Introductionmentioning

confidence: 91%

Section: Mass Balance Equationsmentioning

confidence: 99%

Section: Geometry Modelingmentioning

confidence: 99%

“…result was adopted for the FENSAP-Droplet and ICE. The FENSAP-Droplet and ICE processes are described in our previous published paper [28].…”

Section: Tunnel Test With Chassis Dynamometermentioning

confidence: 99%

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Numerical Study on Prediction of Icing Phenomena in Fresh Air and Blow-by Gas Mixing Region of Diesel Engine under High Velocity of Intake Air Condition

Yoon,

Lee,

Park

2024

Energies

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“…Therefore, the charge air cooler (CAC) and intercooler, which are heat exchanger auxiliary devices of an internal combustion (IC) engine into which a high-temperature mixed gas is introduced, carry water vapor. Recently, heat exchangers have been required to maintain efficiency and durability; however, there are various disadvantages owing to internal water vapor and difficulties, such as loss of function [10][11][12][13]. Gürbüz et al performed a series of tests on the exhaust waste heat recovery using a thermoelectric generator (TEG) in a propanefueled spark-ignition (SI) engine.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Condensation in the Heat Exchangers of Engine Intake Systems according to External Environmental and Operating Conditions

Ju,

Chung,

Lee

et al. 2023

International Journal of Energy Research

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Low-pressure exhaust gas recirculation (LP-EGR) systems are applied to diesel engines because they reduce nitrogen oxide emission by lowering the internal temperature of the cylinder by mixing the oxides with intake air. However, low-temperature ambient conditions include a large amount of vapor in the mixed gas flowing into the intercooler; when heat is exchanged, the water vapor condenses and is adsorbed on the surface of the intercooler fin to form a liquid film. Condensation occurs as the thermal resistance between the vapor and solid surface increases with the thickness of the liquid film and causing a corrosion due to condensation of the surface. In this study, the amount of condensation was predicted through calculations based on thermodynamic studies. Factors that can cause condensation inside the intercooler (fuel, air, and LP-EGR) were selected as variables. A mathematical formula was established to predict the convergence form of condensation or the amount of condensation over time at various temperature and relative humidity conditions. The formula predicted the condensation amount in the intercooler of the diesel engine, compared it to the actual amount of condensation in the test evaluation with an error of less than 4%. Additionally, because the formula can predict the amount of condensation by changing the heat exchange area of the intercooler, the application range of the formula was expanded to predict the condensation in the intercoolers of gasoline vehicles with different heat exchange areas and fuel types. The condensation error was within 2%, indicating a high consistency. Validation of the formula predicts a reliable amount of condensation under various operating and ambient temperature conditions, which means that both the time and cost of the test evaluation require the determination of the cause before solving the actual condensation problem.

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Structure of the Air Flow in the Cylinder of Engines with Inlet Pipelines of Various Configurations

Plotnikov

2023

J Eng Phys Thermophy

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Numerical study on prediction of icing phenomena in intake system of diesel engine: Operating conditions with low-to-middle velocity of inlet air

Cited by 6 publications

References 20 publications

Numerical Study on Prediction of Icing Phenomena in Fresh Air and Blow-by Gas Mixing Region of Diesel Engine under High Velocity of Intake Air Condition

Numerical Study on Prediction of Icing Phenomena in Fresh Air and Blow-by Gas Mixing Region of Diesel Engine under High Velocity of Intake Air Condition

Prediction of Condensation in the Heat Exchangers of Engine Intake Systems according to External Environmental and Operating Conditions

Structure of the Air Flow in the Cylinder of Engines with Inlet Pipelines of Various Configurations

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