This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Methodology to Perform Conjugate Heat Transfer Modeling for a Piston on a Sector Geometry for Direct-Injection Internal Combustion Engine Applications
Technical Paper
2019-01-0210
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
The increase in computational power in recent times has led to multidimensional computational fluid dynamics (CFD) modeling tools being used extensively for optimizing the diesel engine piston design. However, it is still common practice in engine CFD modeling to use constant uniform boundary temperatures. This is either due to the difficulty in experimentally measuring the component temperatures or the lack of measurements when simulation is being used predictively. This assumption introduces uncertainty in heat flux predictions. Conjugate heat transfer (CHT) modeling is an approach used to predict the component temperatures by simultaneously modeling the heat transfer in the fluid and the solid phase. However, CHT simulations are computationally expensive as they require more than one engine cycle to be simulated to converge to a steady cycle-averaged component temperature. Furthermore, a piston design optimization study would involve large numbers of simulations and including CHT modeling would be impractical considering the computational expense. Accordingly, in the current publication, an approach to perform piston CHT simulations on sector geometries is proposed to reduce the computational time significantly with minimal impact on the prediction accuracy. The study was performed on a heavy-duty engine at a high load operating condition of 20 bar gross IMEP and engine speed of 1800 rev/min. Since the open cycle portion of the engine cycle cannot be simulated on a sector mesh, a scaling methodology was developed to account for the contribution of the open cycle to the wall heat transfer. The average and the maximum piston temperature from the sector CHT approach were predicted within 35 K and 25 K of the full geometry CHT simulation respectively. Additionally, the distribution of the temperature within the solid piston obtained from the sector CHT simulation was compared to the temperature distributions from a full CHT geometry and the results showed good agreement. The sector CHT approach resulted in a ~8x reduction in computational time on a 1/7 sector geometry.
Recommended Content
Topic
Citation
Kavuri, C. and Anders, J., "Methodology to Perform Conjugate Heat Transfer Modeling for a Piston on a Sector Geometry for Direct-Injection Internal Combustion Engine Applications," SAE Technical Paper 2019-01-0210, 2019, https://doi.org/10.4271/2019-01-0210.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 | ||
Unnamed Dataset 5 | ||
Unnamed Dataset 6 |
Also In
References
- Wickman , D.D. , Senecal , P.K. , and Reitz , R.D. Diesel Engine Combustion Chamber Geometry Optimization using Genetic Algorithms and Multi-Dimensional Spray and Combustion Modeling SAE Technical Paper 2001-01-0547 2001 10.4271/2001-01-0547
- Shi , Y. and Reitz , R.D. Assessment of Optimization Methodologies to Study the Effects of Bowl Geometry, Spray Targeting and Swirl Ratio for a Heavy-Duty Diesel Engine Operated at High-Load SAE Int. J. Eng. 1 1 547 557 2008 10.4271/2008-01-0949
- Kavuri , C. and Kokjohn , S.L. Computational Optimization of a Reactivity Controlled Compression Igition (RCCI) Combustion System Considering Performance at Multiple Modes Simultaneously Fuel 207 1 702 718 2017
- Dempsey , A. and Reitz , R.D. Computational Optimization of Reactivity Controlled Compression Ignition in a Heavy-Duty Engine with Ultra Low Compression Ratio SAE Int. J. Eng. 4 2 2222 2239 2011 10.4271/2011-24-0015
- Kavuri , C. and Kokjohn , S.L. Investigating Air Handling Requirements of High Load Low Speed Reactivity Controlled Compression Ignition (RCCI) Combustion SAE Technical Paper 2016-01-0782 2016 10.4271/2016-01-0782
- Kokjohn , S.L. , Hanson , R. , Splitter , D. , and Reitz , R.D. Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending SAE Int. J. Engines 2 2 24 39 2010 10.4271/2009-01-2647
- Li , Y. and Kong , S.C. Coupling Conjugate Heat Transfer with In-Cylinder Combustion Modeling for Engine Simulation Int. J. Heat Mass Trans. 54 11 2467 2478 2011
- 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 10.4271/2016-01-2235
- 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. Eng. 7 1 366 374 2014 10.4271/2014-01-1180
- Dempsey , A.B. , Selier , P. , Svensson , K. , and Qi , Y. Evaluation of the Two-Step Hiroyasu Soot Model over a Broad Range of Diesel Combustion Systems SAE Technical Paper 2018-01-0242 2018 10.4271/2018-01-0242
- Richards , K.J. , Senecal , P.K. , and Pomraning , E. CONVERGE v2.4 Theory Manual Convergent Science Inc. 2017
- Reitz , R.D. Modeling Atomization Processes in High-Pressure Vaporizing Sprays Atomization Spray Technology 3 309 337 1987
- Svensson , K. and Koci , C. Non-Classical Orifice Characterization SAE Technical Paper 2014-01-1431 2014 10.4271/2014-01-1431
- Schmidt , D.P. and Rutland , C.J. A New Droplet Collision Algorithm J. Comp. Phys. 164 1 62 80 2000
- Patterson , M. and Reitz , R.D. Modeling the Effects of Fuel Spray Characteristics on Diesel Engine Combustion and Emissions SAE Technical Paper 980131 1998 10.4271/980131
- Liu , A.B. , Mather , D.K. , and Reitz , R.D. Modeling the Effects of Drop Drag and Breakup on Fuel Sprays SAE Technical Paper 930072 1993 10.4271/930072
- Frossling , N. N.A.C.A 1956
- Wang , H. , Reitz , R.D. , Yao , M. , Yang , B. et al. Development of an n-Heptane-n-Butanol-PAH Mechanism and Its Application for Combustion and Soot Prediction Combust. Flame 160 3 504 519 2013
- Senecal , P.K. , Pomraning , E. , and Richards , K.J. Multi-Dimensional Modeling of Direct-Injection Diesel Spray Liquid Length and Flame Lift-off Length using CFD and Parallel Detailed Chemistry SAE Paper 2003-01-1043 2003 10.4271/2003-01-1043
- Babajimopoulos , A. , Assanis , D.N. , Flowers , D.L. , Aceves , S.M. et al. A Fully Coupled Computational Fluid Dynamics and Multi-Zone Model with Detailed Chemical Kinetics for the Simulation of Premixed Charge Compression Ignition Engines Int. J. Eng. Res. 6 5 497 512 2005
- Mauss , F. 1998
- Sun , Y. 2007
- Han , Z. and Reitz , R.D. Turbulence Modeling of Internal Combustion Engines Using RNG k-e Models Comb. Sci. Tech. 106 4 267 295 1995
- Amsden , A.A. 1997