发动机对工程机械动力舱内热环境的影响分析

Analysis on influence of engine on thermal environment inside power cabin of construction machinery

针对由于矿用轮式装载机冷却系统散热效率较低,造成整机行走困难以及工作装置提升无力的问题,基于虚拟风洞的仿真模型,对装载机动力舱热环境进行了三维CFD仿真。预测了排气管和消声器等高温热源对热环境的影响规律,得到了分别在吹风式风扇和吸风式风扇工况下的动力舱内部流场和温度场分布,并对高温热源进行了隔离。对装载机在典型作业工况下进行了试验测试,得到了结构改进后的整车热平衡测试结果,表明高温热源进行隔离后,整车热平衡得到明显改善。

Due to the low thermal dissipation efficiency of the cooling system of the mine wheeled loader, the loader is hard to walk and the working device is unable to ascend. In view of the above problems, the paper conduct 3 D CFD simulation on thermal environment inside the power cabin of the loader based on the simulation model of virtual wind tunnel. It also predicted the influence laws of such high-temperature thermal sources as exhaust pipe and muffler on thermal environment, and separately obtained the distribution of the flow field and the temperature field inside the power cabin in the operation mode of blow-typed fan and suctiontyped fan. And then, the high-temperature thermal sources were isolated. After that, the filed test for the loader in typical operation modes was conducted, and the thermal balance test results of the loader with improved structure were obtained. The test results showed the thermal balance of the loader remarkably improved after the high-temperature thermal source being isolated.