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Modeling Heat Loss through Pistons and Effect of Thermal Boundary Coatings in Diesel Engine Simulations using a Conjugate Heat Transfer Model
Technical Paper
2016-01-2235
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Heat loss through wall boundaries play a dominant role in the overall performance and efficiency of internal combustion engines. Typical engine simulations use constant temperature wall boundary conditions [1, 2, 3]. These boundary conditions cannot be estimated accurately from experiments due to the complexities involved with engine combustion. As a result, they introduce a large uncertainty in engine simulations and serve as a tuning parameter. Modeling the process of heat transfer through the solid walls in an unsteady engine computational fluid dynamics (CFD) simulation can lead to the development of higher fidelity engine models. These models can be used to study the impact of heat loss on engine efficiency and explore new design methodologies that can reduce heat losses. In this work, a single cylinder diesel engine is modeled along with the solid piston coupled to the fluid domain. Conjugate heat transfer (CHT) modeling techniques were implemented to model heat losses for a full cycle of a Navistar diesel engine. This CFD model is then validated against experimental data available from thermocouples embedded inside the piston surface. The overall predictions from the model match closely with the experimental observations. The validated model is further used to explore the benefits of thermal barrier coatings (TBC) on piston bowls. The effect of TBC coatings were modeled as a thermal resistance in the heat transfer model. Full cycle 3D engine simulations provide quantitative insights into heat loss and thus calculate the efficiency gain by the use of TBC coatings. The work establishes a validated modeling framework for CHT modeling in reciprocating engine simulations.
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Kundu, P., Scarcelli, R., Som, S., Ickes, A. et al., "Modeling Heat Loss through Pistons and Effect of Thermal Boundary Coatings in Diesel Engine Simulations using a Conjugate Heat Transfer Model," SAE Technical Paper 2016-01-2235, 2016, https://doi.org/10.4271/2016-01-2235.Also In
References
- Som , S. , Longman , D. , Aithal , S. , Bair , R. et al. A Numerical Investigation on Scalability and Grid Convergence of Internal Combustion Engine Simulations SAE Technical Paper 2013-01-1095 2013 10.4271/2013-01-1095
- Senecal , Peter K. , Eric Pomraning , Anders J. W. , Weber M. R. , Gehrke C. R. , Polonowski C. J. , and Mueller C. J. Predictions of Transient Flame Lift-off Length With Comparison to Single-Cylinder Optical Engine Experiments Journal of Engineering for Gas Turbines and Power 136 11 2014 111505
- Pei , Y. , Shan , R. , Som , S. , Lu , T. et al. Global Sensitivity Analysis of a Diesel Engine Simulation with Multi-Target Functions SAE Technical Paper 2014-01-1117 2014 10.4271/2014-01-1117
- Borman , G. and Nishiwaki K. Internal-combustion engine heat transfer Progress in energy and combustion science 13 1 1987 1 46
- Urip , Egel , Liew Ka Heng , and Yang S. L. Modeling IC engine conjugate heat transfer using the KIVA code Numerical Heat Transfer, Part A: Applications 52 1 2007 1 23
- Li , Y , and Song-Charng Kong Coupling conjugate heat transfer with in-cylinder combustion modeling for engine simulation International Journal of Heat and Mass Transfer 54 11 2011 2467 2478
- Iqbal , O. , Arora , K. , and Sanka , M. Thermal Map of an IC Engine via Conjugate Heat Transfer: Validation and Test Data Correlation SAE Int. J. Engines 7 1 366 374 2014 10.4271/2014-01-1180
- Richards , K. J. , Senecal P. K. , and Pomraning E. CONVERGE (Version 2.1. 0) Theory Manual Convergent Science, Inc. Middleton, WI 2013
- Han , Z. and Reitz , R.D. Turbulence modeling of internal combustion engines using RNG κ-ε model Combustion science and technology 1995 106 4-6 267 295
- Reitz , R. D. Modeling atomization processes in high-pressure vaporizing sprays Atomisation Spray Technology 3 1987 309 337
- Schmidt , D. P. , and Rutland C. J. A new droplet collision algorithm “Journal of Computational Physics 164 1 2000 62 80
- Patterson , M. and Reitz , R. Modeling the Effects of Fuel Spray Characteristics on Diesel Engine Combustion and Emission SAE Technical Paper 980131 1998 10.4271/980131
- Frossling , N. Evaporation, Heat Transfer, and Velocity Distribution in Two-Dimensional and Rotationally Symmetrical Laminar Boundary-Layer Flow N.A.C.A. 168 AD-B189 1956
- Som , S. , Longman , D. , Aithal , S. , Bair , R. et al. A Numerical Investigation on Scalability and Grid Convergence of Internal Combustion Engine Simulations SAE Technical Paper 2013-01-1095 2013 10.4271/2013-01-1095
- http://www.tfd.chalmers.se/~valeri/MECH.html
- Senecal , P. , Pomraning , E. , Richards , K. , Briggs , T. et al. Multi-Dimensional Modeling of Direct-Injection Diesel Spray Liquid Length and Flame Lift-off Length using CFD and Parallel Detailed Chemistry SAE Technical Paper 2003-01-1043 2003 10.4271/2003-01-1043
- Heywood , J.B. 1988 Internal Combustion Engine Fundamentals 0-07-100499-8