Experimental study on heat transfer performance of heating pipeline of heavy-duty diesel engine's lubricant tank under extreme cold condition

doi:10.3785/j.issn.1006-754X.2025.04.173

Chinese Journal of Engineering Design

2025, Vol. 32

Issue (1): 121-131 DOI: 10.3785/j.issn.1006-754X.2025.04.173

Optimization Design

Experimental study on heat transfer performance of heating pipeline of heavy-duty diesel engine's lubricant tank under extreme cold condition

Zengxin QIAO¹(

),Xiaoxia SUN^2,³,Lili SHEN²,Siyu ZHENG¹,Mingshan WEI^1,⁴(

)

^1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
^2.China North Vehicle Research Institute, Beijing 100072, China
^3.Chinese Scholar Tree Ridge State Key Laboratory, Beijing 100072, China
^4.School of Mechanical and Electrical Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China

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Abstract

In order to investigate the heat transfer performance of heating pipeline of a heavy-duty diesel engine's lubricant tank during the preheating stage under extremely cold conditions, a test platform for heat transfer performance of the heating pipeline of lubricant tank was constructed. The temperature variation law of the lubricant in the tank during the preheating process was studied, the working parameters such as coolant inlet temperature, volume flow rate and lubricant initial temperature were adjusted, and the effects of different working conditions on the lubricant temperature variation were analyzed. The test results showed that when the lubricant initial temperature was -50 ℃, its high viscosity led to a very uneven temperature distribution inside the tank during preheating with only a few temperature measuring points showing a significant increase. Increasing the inlet temperature and volume flow rate of the coolant both increased the average heat transfer power, especially the increase of coolant inlet temperature had a more significant effect on the increase of average heat transfer power. When the lubricant initial temperature to -40, -30 and -20 °C respectively, the average heat transfer power increased first and then decreased, and when the lubricant initial temperature was -40 ℃, the average heat transfer power was maximum. The research results provide a reference for optimizing the lubricant preheating strategy and improving the structure of heating pipeline of the lubricant tank.

Key words： extreme cold condition cold start oil preheating viscosity

Received: 11 October 2024 Published: 04 March 2025

CLC:

TK 427

Corresponding Authors: Mingshan WEI E-mail: 3120220486@bit.edu.cn;mswei@bit.edu.cn

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Cite this article:

Zengxin QIAO,Xiaoxia SUN,Lili SHEN,Siyu ZHENG,Mingshan WEI. Experimental study on heat transfer performance of heating pipeline of heavy-duty diesel engine's lubricant tank under extreme cold condition. Chinese Journal of Engineering Design, 2025, 32(1): 121-131.

URL:

https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2025.04.173 OR https://www.zjujournals.com/gcsjxb/Y2025/V32/I1/121

极寒条件下重型柴油机润滑油箱加热管路传热性能试验研究

为了探究极寒条件下某款重型柴油机润滑油箱加热管路在预热阶段的传热性能，搭建了润滑油箱加热管路传热性能试验平台。研究了在润滑油预热过程中油箱内润滑油的温度变化规律，并调整冷却液进口温度、体积流量和润滑油初始温度等工况参数，分析不同工况对润滑油温度变化的影响。试验结果表明：当润滑油初始温度为-50 ℃时，其高黏度特性使得在预热过程中油箱内的温度分布十分不均匀，只有较少测温点的温度上升明显；提高冷却液进口温度和体积流量都会增大平均换热功率，特别是冷却液进口温度的提高对增大平均换热功率具有更加显著的作用；提高润滑油初始温度分别至-40、-30、-20 ℃，则平均换热功率呈先增大后减小的趋势，当润滑油初始温度为-40 ℃时，平均换热功率最大。研究结果为优化润滑油预热策略、改进润滑油箱加热管路的结构提供了参考。

关键词： 极寒条件, 冷起动, 润滑油预热, 黏度

Fig.1 Lubricant and coolant for testing

Fig.2 Physical properties of lubricant

Fig.3 Test platform for heat transfer performance of heating pipeline of lubricant tank

Fig.4 Structure of lubricant tank

Fig.5 Structure of heating pipeline

Table 1 Main physical parameters of PVC and red copper

Fig.6 Setting of temperature measuring points

Fig.7 Variation curves of lubricant temperature at each temperature measuring point under standard heating condition

Fig.8 CD 5W-40 lubricant condition at -50 °C

Fig.9 CD 5W-40 lubricant conditions under different heating time

Fig.10 Temperature variation curves of T5 and T9 points under different coolant inlet temperatures

Fig.11 Temperature variation curves of T5 and T9 points under different coolant volume flow rates

Fig.12 Temperature variation curves of T5 and T9 points under different lubricant initial temperatures

Fig.13 Variation curves of heat transfer power and cumulative heat transfer capacity with time under different coolant inlet temperatures

Fig.14 Variation curves of heat transfer power and cumulative heat transfer capacity with time under different coolant volume flow rates

Fig.15 Variation curves of heat transfer power and cumulative heat transfer capacity with time under different lubricant initial temperatures

Fig.16 Effect of coolant inlet temperature on average heat transfer power

Fig.17 Effect of coolant volume flow rate on average heat transfer power

Fig.18 Effect of lubricant initial temperature on average heat transfer power


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