为了提升换热器的预热性能、缩短发动机冷起动时间，以机油箱中的竖置螺旋盘管换热器为研究对象，基于台架试验验证的仿真计算模型，开展了一系列低温润滑油预热模拟研究，分析了管内热流体介质的流量和温度对预热性能的影响。结果表明：与介质温度相比，管内介质流量对高温油液体积变化的影响较小，介质流量从10 L/min增至20 L/min时，预热1 800 s后温度达到303.15 K的油液体积占比从20.76%增至25.52%，预热3 600 s后高温油液体积占比从52.21%增至55.91%；管内介质温度越高，高温油液体积增长速率越快，介质温度从333.15 K增至363.15 K时，预热1 800 s后温度达到303.15 K的油液体积占比从20.76%增至54.51%，预热3 600 s后体积占比从52.21%增至78.76%。

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.