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内燃机车在隧道中运行时会受到温度升高的影响。为了使机车免受这种不良的热影响，需要在机车上加装进、排气导流装置。文中介绍了伊朗铁路从美国GM公司进口的GT26CW型机车在隧道中运行的试验结果对比分析。试验结果表明，机车装用导流装置比不装导流装置具有明显的降低进气温度的效果。
Diesel locomotive running in the tunnel will be affected by the temperature rise. In order to protect the locomotive from such adverse thermal effects, it is necessary to add intake and exhaust deflectors to the locomotive. This paper presents a comparative analysis of the test results of the GT26CW locomotives imported from the United States GM Company by Iranian Railways in tunnels. The test results show that the locomotive mounted deflector has a significantly lower inlet air temperature than the deflector not installed.