RESEARCH OF A HIGH-EFFICIENCY CHARGE AIR COOLER

Q4 Engineering
A. Savchenko, M. Shelestov
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引用次数: 0

Abstract

Currently, internal combustion engines have become widespread as sources of mechanical energy in many areas of human activity. It is the internal combustion engines that were and remain the most widespread in transport, where, as a rule, strict requirements are put forward for the mass-dimensional characteristics of the engines and the power plant as a whole. In order to meet these requirements, there is a constant increase in the level of forcing of the engines. For diesel engines, the most common technical measure that provides an increase in the level of engine forcing with almost unchanged weight and dimensional characteristics is an increase in supercharging pressure. However, as a result of air compression, its temperature increases, which is proportional to the degree of increase in air pressure in the compressor. An increase in air temperature causes a decrease in the mass charge of the cylinders, and therefore, a significant deterioration in the fuel combustion process. It also causes an increase in the level of maximum temperatures of the cycle, which in turn causes an increase in thermal loads and the rate of formation of nitrogen oxides in diesel cylinders. The above determines the urgency of the tasks of implementing effective charge air coolers in modern high-pressure transport diesel engines. This technical problem can be solved using air or liquid coolers. The article considers a liquid cooler, because compared to an air cooler, it can be made more compact, allows to achieve a much smaller length and volume of the intake tract, as well as to simplify the layout of the intake tract as part of the power plant as a whole, which is a priority for diesel engines. The article considers the influence of the design parameters of the supercharged air cooler on its overall characteristics and the hydraulic resistance of the supercharged air flowing through the cooler. Thus, the article provides data indicating the possibility of making a compact, highly efficient supercharged air cooler while maintaining its hydraulic resistance at an acceptable level by choosing rational parameters.
高效充风冷却器的研究
目前,内燃机作为机械能的来源已广泛应用于人类活动的许多领域。内燃机过去是并且现在仍然是交通运输中应用最广泛的发动机,通常对发动机和整个动力装置的质量尺寸特性提出了严格的要求。为了满足这些要求,发动机的压力水平不断增加。对于柴油发动机来说,在重量和尺寸特性几乎不变的情况下,提高发动机压力水平最常见的技术措施是增加增压压力。但是,由于空气压缩,其温度升高,这与压缩机中空气压力增加的程度成正比。空气温度的升高导致气缸质量电荷的减少,因此,燃料燃烧过程的显著恶化。它还导致循环最高温度水平的增加,这反过来又导致热负荷和柴油气缸中氮氧化物形成率的增加。以上决定了在现代高压输送柴油机中实施有效增压空气冷却器任务的紧迫性。这个技术问题可以用空气冷却器或液体冷却器来解决。文章考虑了一个液体冷却器,因为与空气冷却器相比,它可以做得更紧凑,允许实现一个更小的长度和体积的进气道,以及简化进气道的布局作为发电厂的一部分作为一个整体,这是柴油发动机的优先事项。本文考虑了增压空气冷却器的设计参数对其总体特性和增压空气流过冷却器的水力阻力的影响。因此,本文提供的数据表明,通过选择合理的参数,使一个紧凑,高效的增压空气冷却器,同时保持其液压阻力在一个可接受的水平的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
1.00
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发文量
3050
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