建设性因素对汽缸热状态的影响

Q4 Engineering
О. В. Триньов, С. С. Кравченко
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引用次数: 0

摘要

在本研究中,气缸套热状态的优化涉及到将其工作表面在压缩环工作区域的温度均衡到一定水平,使机油的最佳粘度达到一定水平,并减少活塞-套耦合过程中的机械损失。采用导热系数比大多数系列套筒材料高的铝合金——生铁MH作为温度均衡的主要手段。套筒工作表面的耐磨性由刚玉涂层保证。给出了测定涂层隔热效果的非电机实验结果,以及用刚玉涂层的铝合金壳体的热态计算结果。采用基于有限元法的数学模型进行计算。结果表明,在工作温度范围内使用具有高导热性的AL19铝合金,由于更强烈的热量从套筒上带排出,可以显着降低热应力最大区域(从278°C到214°C)的温度。在工作面邻近区域也观察到温度下降30-50°C。同时,刚玉层的绝缘效果不显著,在2-5℃范围内评价,因此,这种厚度为0.2 - 0.3 mm的层仅被认为是保护工作表面不受磨损的一种手段。此外,研究结果表明,压缩环摩擦区仍保持过冷状态(158 ~ 102℃),尤其是靠近下安全带的区域。解决这个问题可以应用于搪瓷或其他导热系数明显较低的涂层的套筒外表面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
INFLUENCE OF CONSTRUCTIVE FACTORS ON THE HEAT CONDITION OF THE CYLINDERS
The optimization of the thermal state of the cylinder sleeve in the study involves equalizing the temperature of its working surface in the area of operation of the compression rings to a certain level at which the optimum viscosity of the engine oil is achieved and the mechanical losses in the conjugation of the piston-sleeve are reduced. The use of aluminum alloys with a higher thermal conductivity than the materials of most serial sleeves - pig iron MH is considered as the main means of temperature equalization. The wear resistance of the working surface of the sleeve is ensured by the corundum coating. The results of the nonmotor experiment for the determination of the heat-insulating effect of the coating, the results of calculations of the thermal state for variants of aluminum alloy casings with corundum coating are given. Calculations are performed using a mathematical model based on the finite element method. It is shown that the use of an aluminum alloy AL19 with high thermal conductivity in the working temperature range allows for a significant reduction of the temperature in this most thermally stressed zone (from 278 to 214 ° C) due to more intense heat removal from the upper belt of the sleeve. The decrease of temperatures by 30-50 ° C is also observed in the adjacent zones of the working surface. At the same time, the insulating effect of the corundum layer is insignificant and evaluated within 2-5 ° C. Therefore, such a layer with a thickness of 0,2-0,3 mm is considered only as a means of protecting the working surface from wear. In addition, the results of the study show that the friction zone of the compression rings still remains supercooled (158-102°C), especially near the lower seating belt. Solving the problem can be applied to the outer surface of the sleeves of enamel or other coatings that have a significantly lower thermal conductivity.
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来源期刊
CiteScore
1.00
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发文量
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