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中文摘要：
针对现有内燃机车冷却系统在特殊工况下散热能力不足的问题，在不改变原有冷却系统的基础上增加附加换热器，经计算分析得出满足换热能力和空间尺寸条件的最优参数．并针对主换热器的不同出水水温，分析了要保证内燃机进口水温相对稳定需进入附加换热器的水流量及该水温与水流量的关系曲线．新系统在具有线性特性的温控阀控制下，可实现根据附加换热器进水温度对其进水流量的自动调节，确保内燃机车的安全平稳运行．
英文摘要：
Based on the original cooling system, an additional heat exchanger was added to solve the problem that the diesel locomotives cooling system cannot spread out enough heat amount under special conditions. By calculation and analysis, the optimal parameters of the additional heat ex changer satisfying the requirement of heat transfer ability and spatial sizes were provided. To ensure the stability of water inlet temperature of combustion engine, the needed water inlet flow of the additional heat exchanger was analyzed to match the water outlet temperature of the main beat exchanger. The new system can automatically control water flow according to the water inlet temperature of additional heat exchanger by using a thermostatic valve with linear characteristics to ensure diesel locomotive running safely and smoothly.
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