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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

Summary

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.

Reference

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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)

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