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首页> 外文期刊>The Open Mechanical Engineering Journal >Research on Impact of Cooling Fan’s Geometry on Nozzle’s Heat Load of the Air-Cooled Diesel Engine
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Research on Impact of Cooling Fan’s Geometry on Nozzle’s Heat Load of the Air-Cooled Diesel Engine

机译：冷却风扇几何形状对空冷柴油机喷嘴热负荷的影响研究

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In order to study the nozzle’s temperature distribution and to reduce its heat load, the heat transfer boundarycondition of nozzle has been simplified appropriately, considering the details of the convectional heat transfer inside thenozzle and the needle body contact heat transfer. Results of the simulation with ANSYS software show that the nozzle’stemperature distribution is complicated and high-temperature region are concentrated in the nozzle’s head. Consideringthe fact that the cooling fan plays an important role in reducing the heat load of air-cooled engine, the test points werereasonably selected to measure the needle valve body’s temperature as well as to seek reasonable cooling fan bladenumbers and the blade installation angle for the air outlet in order to improve the thermal load of the nozzle. It was foundthat the nozzle’s temperature decreases at first but then increased when the fan blade numbers and the blade installationangle for air outlet increased, and the impact of the number of blades on the nozzle’s temperature was more significantthan the blade installation angle for the air outlet. With the scheme of the blade installation angle of 132° with respect tothe air outlet and with 20 blades, the temperature of the nozzle needle valve’s head and middle decreases to 21 K and 7 Kon average compared with the original scheme, which has a good effect on reducing the temperature of the nozzle’sneedle valve head, and the temperature gradient between two test points also reduced by 0.65 K/mm on average. Itprovides a reference for reducing the nozzle’s heat load.
机译：为了研究喷嘴的温度分布并减少其热负荷，考虑到喷嘴内部对流传热和针体接触传热的细节，适当地简化了喷嘴的传热边界条件。 ANSYS软件的仿真结果表明，喷嘴的温度分布复杂，高温区域集中在喷嘴的头部。考虑到冷却风扇在降低空冷发动机的热负荷中起着重要作用，因此合理选择测试点来测量针阀体的温度，并寻找合理的冷却风扇叶片数和空气叶片的安装角度出口以改善喷嘴的热负荷。结果发现，当风扇叶片的数量和出风口的叶片安装角度增加时，喷嘴的温度先降低，然后升高，并且叶片数量对喷嘴温度的影响比出风口的叶片安装角度更大。相对于出风口的叶片安装角度为132°的方案以及20个叶片，与原来方案相比，喷嘴针阀的头部和中间温度降低至21 K和平均7 Kon。降低了喷嘴的针阀头温度，两个测试点之间的温度梯度也平均降低了0.65 K / mm。它为减少喷嘴的热负荷提供了参考。

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