1. Home
  2. Honda R&D Technical Review Vol.27 N...
  3. Estimation Technology Establishment...

Technical Review e-Book: Summary

Estimation Technology Establishment for Temperature Distributions of Engine Based on Thermal Balance under Vehicle Running Conditions

Article of Honda R&D Technical Review Vol.27 No.2


The estimation of the temperature distributions of an engine requires consideration on the process of releasing heat generated through combustions to the atmosphere. In this study, the heat inflow/outflow balance was calculated using one-dimensional thermal simulation tool. Using those results as boundary conditions, three-dimensional simulation on the structures of an engine was conducted to establish a method to estimate the heat distributions of an engine. An air-cooled engine, whose cooling conditions are highly susceptible to its configuration and shape, was selected as the target engine for investigation.
The 1D simulation for calculating the heat balance was structured with four specific methodologies. The first one was an engine cycle simulation method that calculates the heat transfer from the combustion gas to the engine structures. The second one was a heat transfer simulation method in which engine components were replaced with simple shaped objects. The third one was a CFD coupled with an empirical formula to calculate the heat transfer to oils situated in various regions in an engine. The last method was a CFD simulation applied to the running conditions of a complete vehicle to calculate the heat transfer to the atmosphere.
Utilizing the results yielded through this one-dimensional thermal simulation as the boundary conditions, the three-dimensional temperature distributions were estimated. As the result, it was confirmed that the temperature distributions of an engine could be estimated with a high accuracy under running conditions of a complete vehicle. Moreover, it was verified that the temperature distributions can be estimated accurately for a variety of vehicles with engines of different specifications and mounting conditions.


(1) Takahashi, Y., Gokan, Y.: CFD Analysis of Air Flow of Air-Cooled Motorcycle Engines, SAE Technical Paper, 2006-32-0005 (2006)
(2) Baird, A., Thornhill, D., Cunningham, G., Troxler, P., Price, B.: CFD Simulations of Heat Transfer from Air Cooled Engines, SAE Technical Paper, 2006-32-0004 (2006)
(3) Gokhale, A., Karthikeyan, N.: Optimization of Engine Cooling Through Conjugate Heat Transfer Simulation and Analysis of Fins, SAE Technical Paper, 2012-32-0054 (2012)
(4) Mahmoud, K., Loibner, E., Krammer, J.: Integrated 1-D Tools for Modeling Vehicle Thermal Management, SAE Technical Paper, 2004-01-3406 (2004)
(5) Moffat, J.: Coupling of 1-D and 3-D CFD Models to Predict Transient Hydraulics in an Engine Cooling Circuit, SAE Technical Paper, 2002-01-1285 (2002)
(6) Horikawa, H., Kido, H., Iijima, S., Murakami, Y.: Prediction Technology of Engine Power and Intake/Exhaust Noise Using 1D-Simulation for Small-Displacement Motorcycles, SAE Int. J. Engines 3(2), p.428-437 (2010)
(7) Onorati, A., Ferrari, G., Cerri, T., Cacciatore, D., Ceccarani, M.: 1D Thermo-Fluid Dynamic Simulation of a High Performance Lamborghini V12 S.I. Engine, SAE Technical Paper, 2005-01-0692 (2005)
(8) Nomura, T., Matsushita, K., Fujii, Y., Fujiwara, H.: Development of Temperature Estimation Method of Whole Engine Considering Heat Balance under Vehicle Running Conditions, SAE Int. J. Engines 8(1), p.120-134 (2015)
(9) Klingebiel, F., Kahlstorf, U.: Simulating Engine Lubricaton Systems with 1-D Fluid Flow Models, SAE Technical Paper, 2000-01-0284 (2000)
(10) Koshizuka, S., Oka, Y.: Moving-Particle Semi-implicit Method for Fragmentation of Incompressible Fluid, Nuclear. Science and Engineering, Vol. 123, p.421-434 (1996)
(11) Muto, K., Sakai, I., Ozaki, N.: Prediction of the Fluid Resistance in Stirred Fluid Using The Particle Method, Transactions of Society of Automotive Engineers of Japan, Vol. 41, No. 1, p.147-151, (2010) (in Japanese)
(12) Ishii, M.: Thermo-Fluid Dynamics Theory of Two-Phase Flow, Eyrolles, Paris (1975)
(13) Basara, B., Alajbegovic, A., Beader, D.: Simulation of Single- and Two-Phase Flows on Sliding Unstructured Meshes Using Finite Volume Method, International. Journal for Numerical Methods in Fluid, Volume 45, Issue 10, p.1137-1159 (2004)
(14) Martin, H.: Heat and Mass Transfer between Impinging Gas Jets and Solid Surface, Advances in Heat Transfer, Volume 13, p.1-60 (1977)
(15) Tsubokura, M., Nakashima, T., Nouzawa, T., Nakamura, T., Kitoh, K., Zhang, H., Hori, K., Oshima, N. and Kobayashi, T.: Numerical Prediction of Unsteady Aerodynamic Forces on Road Vehicles Using High Performance LES, FISITA World Automotive Congress (2008)

Author (organization or company)

Tomokazu NOMURA(Motorcycle R&D Center)、Koichiro MATSUSHITA(Motorcycle R&D Center)、Yoshihiko FUJII(Motorcycle R&D Center)、Hirofumi FIJIWARA(Motorcycle R&D Center)

We would like to get your opinion on this research paper. (This is only applicable to registered members.)

The readers of this research paper have also selected these research papers.

Downsizing as Evolution of High Thermal Efficiency Gasoline Engine
Article of Honda R&D Technical Review Vol.27 No.2
Intake Design for Reduction of Duration of Combustion
Article of Honda R&D Technical Review Vol.27 No.2
Hybrid System Heat Management that Contributes to High Performance for New NSX
Article of Honda R&D Technical Review Vol.28 No.2