Influences of Thermal Fluid Parameters on Preheating Performance Law of Lubricating Oil

doi:10.3969/j.issn.1001-2222.2025.03.002

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (3) : 9-15. DOI: 10.3969/j.issn.1001-2222.2025.03.002

XU Yongji^1,2,DU Wei¹,GUO Junbao²,ZHANG Hao¹

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Abstract

To improve the preheating performance of heat exchanger and reduce engine cold start duration, the vertical spiral coil heat exchanger in the engine oil tank was investigated. Using a bench-validated simulation model, a series of lowtemperature lubricant preheating simulations were conducted, and the impact of thermal fluid medium flow rate and temperature on preheating performance was analyzed. The results indicate that the flow rate of medium has minor effect on the volume change of high-temperature fluid compared with the medium temperature. Increasing the medium flow rate from 10 L/min to 20 L/min elevates the conditioned oil volumetric fraction at 303.15 K from 20.76% to 25.52% after 1 800 s preheating, while extending preheating duration to 3 600 s raises the high-temperature oil fraction from 52.21% to 55.91%. In addition, higher medium temperatures accelerate the growth rate of conditioned oil volume. When medium temperature increases from 333.15 K to 363.15 K, the volumetric fraction of oil reaching 303.15 K increases from 20.76% to 54.51% after 1 800 s preheating and from 52.21% to 78.76% after 3 600 s preheating.

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lubricating oil / preheating performance / heat exchanger / heat exchange

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XU Yongji, DU Wei, GUO Junbao, ZHANG Hao. Influences of Thermal Fluid Parameters on Preheating Performance Law of Lubricating Oil[J]. Vehicle Engine. 2025, 0(3): 9-15 https://doi.org/10.3969/j.issn.1001-2222.2025.03.002