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首页> 外文期刊>Agricultural mechanization in Asia, Africa and Latin America >Influence of Pad Configuration on Evaporative Cooling System Effectiveness Inside a Wind Tunnel
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Influence of Pad Configuration on Evaporative Cooling System Effectiveness Inside a Wind Tunnel

机译：垫板结构对风洞内蒸发冷却系统效率的影响

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摘要

The investigation has been conducted to study the influence of pad configuration on the evaporative cooling effectiveness inside a wind tunnel. Three different configurations of pad were designed and these were expressed in terms of vertical, horizontal and multi-horizontal. As well as, the influence of both pad thickness and pad-face air velocity was investigated. A developed wind tunnel was employed as pad-fan evaporative cooling system to fulfill the objectives of study. The experimental results revealed that the multi-horizontal pad configuration has achieved the highest values of cooling potential if it is compared with the other two pad configurations during the whole period of operation. The highest average cooled air temperature inside the wind tunnel was found at pad thickness of 15cm and pad-face air velocity of lm/s for the multi-horizontal pad configuration. For multi-horizontal pad configuration and 1m/s pad-face air velocity, the mean cooling potential was raised from 7.46 to 11.78 ℃ (+57.91 %) by increasing pad thickness from 3 to 15cm. The highest mean values of cooling potential were found at pad thickness of 15cm and pad-face air velocity of 1 m/s for the multi-horizontal pad configuration. Saturation efficiency was dramatically raised by increasing the thickness of pad especially for multi-horizontal pad configuration. The required airflow rate was raised by increasing both of pad thickness and pad-face air velocity for all configurations of pad. It has been reached its maximum values when applying the multi-horizontal pad configuration because of the rapid fluctuations taken place in airflow resistance. By increasing pad thickness from 3 to 15 cm, for multi-horizontal pad configuration and pad-face air velocity of lm/s, the static pressure drop across the pad was raised from 31.39 to 70.63 Pa (+125%).
机译：已经进行了研究以研究垫结构对风洞内部的蒸发冷却效率的影响。设计了三种不同的衬垫配置，分别以垂直，水平和多水平表示。同时，还研究了垫厚度和垫面空气速度的影响。为了达到研究目的，采用了发达的风洞作为鼓风机蒸发冷却系统。实验结果表明，如果在整个运行期间将其与其他两个衬垫配置进行比较，则多水平衬垫配置已实现了最高的冷却潜能值。对于多水平垫配置，发现风洞内部的最高平均冷却空气温度为15cm的垫厚度和lm / s的垫面空气速度。对于多水平垫结构和1m / s的垫面空气速度，通过将垫厚度从3cm增加到15cm，平均冷却电位从7.46℃提高到11.78℃（+57.91％）。对于多水平垫配置，在15cm的垫厚度和1m / s的垫面空气速度下发现​​了最高的冷却潜能平均值。通过增加焊盘的厚度可以显着提高饱和效率，尤其是对于多水平焊盘配置而言。通过增加衬垫的所有配置的衬垫厚度和衬垫表面空气速度，可以提高所需的空气流速。由于气流阻力发生快速波动，因此在应用多水平垫配置时已达到最大值。通过将衬垫厚度从3 cm增加到15 cm，以实现多水平衬垫配置和lm / s的衬垫表面空气速度，整个衬垫的静压降将从31.39 Pa增加到70.63 Pa（+ 125％）。

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