Experimental Study on the Performance Attenuation of Radiator
The radiator of a diesel locomotive is a vital component of its cooling system.As the mileage increases,the surface area of the fins becomes covered by ash,and the radiator tubes accu-mulate by fouling or deposits due to corrosion erosion,and blockage caused by damaged sections.This cumulative effect leads to an increase in thermal resistance,as well as increased air-side and water-side flow resistance,ultimately compromising the performance of the radiator and failing to meet the operational requirements of the locomotive's diesel engine.In order to provide mainte-nance and replacement recommendations for the management department based on the duration of operation,it is essential to understand the degradation pattern of the radiator's performance.Therefore,this study conducted heat transfer performance experiments on the dismantled radiator of HXN5 type diesel locomotives after 0.9 million and 1.8 million kilometers of operation,obtaining the actual performance status of the component after these mileage intervals.Under rated operating conditions(with a rated water flow rate and air mass flow rate of 10.3 kg·m-2·s-1),compared to a unused radiator of HXN5 type diesel locomotives,the heat transfer coefficient of the main radia-tor decreased by 22.96％after 0.9 million kilometers of operation,and by 27.93％after 1.8 million kilometers of operation.Additionally,experimental results with varying degrees of blockage indicate that blockage is a secondary factor contributing to the degradation of radiator performance,with the primary factor being the fouling resistance on the surface of the fins and inside the tubes.
HXN5 diesel locomotiveradiatorexperimental studyheat transfer performance
NETL
NSTL
万方数据
维普
