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Research on Prediction of Cooling Air Flow in Small Air-cooled Utility Engines

Article of Honda R&D Technical Review Vol.17 No.1

Summary

This report describes research on the prediction of the cooling air field for air-cooled engines using Computational Fluid Dynamics (CFD). The design of the cooling air field is very important for engine cooling, a factor which has a significant effect on engine performance, fuel consumption, noise, reliability, etc. However, the flow field is very complex because a large number of components are located in the flow passages and the cooling air is generated by a centrifugal fan. In order to understand this flow field, calculations were performed using CFD and measurements were taken in an actual engine. Given practical considerations such as computing time, modeling time, correlation between calculation and test results, formulation of a database, etc., the fan P-Q (pressure vs. volume flow rate) characteristics and the flow field were calculated separately when employing CFD. In addition to visualization using Particle Image Velocimetry (PIV) pressure measurements and measurements of the P-Q characteristics of the cooling fan were employed to measure the flow field in the actual engine. The correlation between the results of CFD calculations and measurements was studied. Almost suitable prediction results were achieved by setting the P-Q characteristics at the boundary surface of the rotational area, as obtained from the calculation of P-Q characteristics, as a fan boundary condition for CFD analysis of the cooling air field. This research has enabled the qualitative and quantitative prediction of the cooling air flow of air-cooled engines.

Reference

(1) Shiga, M., Nishida, T., Ryu, Y., Tsugekawa, T., Higashi, K.: Development of Multipositional Small Four-stroke Engine, HONDA R&D Technical Review, Vol. 9, p. 44-50 (1997)
(2) Ito, K., Ryu, Y., Yoneda, S., Warashina, M., Edamatsu, S.: Development of GX25 4-Stroke Engine for Handheld Equipment, Honda R&D Technical Review, Vol. 14, No. 2, p. 1-8 (2002)
(3) Maeda, T., et al.: Development of All Position-Operable Small Four-Stroke Engine, Small Engine Technology Conference ‘97, 972104, (1997)
(4) Xin, J., et al.: Theoretical Consideration to Improve Engine Cooling and Application of Coupling 3D Combustion Simulations with Heat Transfer in Water Jacket and Components, Honda R&D Technical Review, Vol. 15, No. 2, p. 117-126
(5) Saito, M., et al.: Development of Low Noise Working Machine based on CFD Technique, Small Engine Technology Conference 2002, 20024295, 2002-32-1802, (2002)
(6) JAPANESE INDUSTRIAL STANDARD B 8330:2000 Testing methods for turbo-funs, Japanese Standards Association, (2000)

Author (organization or company)

Toshiro KIURA(Asaka Higashi R&D Center)、Takashi KUSHIBIKI(Asaka Higashi R&D Center)、Kazuyuki SHIOMI(Asaka Higashi R&D Center)

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