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首页> 外文学位 >Determination of Adhesive Strength and Freezing Rate of Ice on Aircraft Structures at Subcooled Temperatures.
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Determination of Adhesive Strength and Freezing Rate of Ice on Aircraft Structures at Subcooled Temperatures.

机译：过冷温度下飞机结构上冰的粘合强度和冰冻速率的测定。

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摘要

Icing is widely recognized as one of the most dangerous, and potentially fatal, weather hazards in aircraft operations. Ice accretion on lifting surfaces is known to increase flow separation and drag, decrease lift, alter the moment and pitch of an aircraft, and cause undesired vibrations throughout the aircraft structure, all of which can lead to loss of control of an aircraft and accidents. It is for these reasons that developing methods to deter ice adhesion to aircraft structures is important to the aircraft operations. The average adhesive strength of ice on aluminum at -5, -10, -20, and -30°C, were measured to be 0.215+/-0.031, 0.184+/-0.031, 0.213+/-0.041, and 0.202+/-0.035 MPa respectively, suggesting that temperature does not affect on the adhesive strength of ice. The adhesive strength of ice was then measured on bare and methoxymethylethoxypropanol, polymethylhydrosiloxane, and octylphenol ethoxylate treated aluminum, stainless steel, copper, and polycarbonate substrates at -10°C. None of the surfactants used in the present study were found to be truly ice-phobic, however, the octylphenol ethoxylate, a surfactant that caused all of the materials observed in the present study to exhibit superhydrophilic surface properties, was revealed to be the only surfactant to reduce the adhesive strength of ice on all of the substrates. At -40°C the volumetric freeze rate of a sessile droplet was measured to be 4.62 mm3/second, and the duration of the entire freezing process of a sessile droplet was 10.67 seconds.
机译：结冰被公认为是飞机运行中最危险，甚至可能致命的天气危险之一。已知在升力表面上积冰会增加气流分离和阻力，降低升力，改变飞机的力矩和俯仰，并在整个飞机结构中引起不希望的振动，所有这些都可能导致飞机失控和事故。出于这些原因，阻止冰粘附在飞机结构上的开发方法对飞机操作很重要。在-5，-10，-20和-30°C下，冰对铝的平均粘合强度经测量为0.215 +/- 0.031、0.184 +/- 0.031、0.213 +/- 0.041和0.202 + / -0.035 MPa，分别表明温度不影响冰的粘合强度。然后在-10℃下在裸露的和甲氧基甲基乙氧基丙醇，聚甲基氢硅氧烷和辛基酚乙氧基化物处理的铝，不锈钢，铜和聚碳酸酯基材上测量冰的粘合强度。没有发现本研究中使用的表面活性剂是真正的憎冰剂，但是，辛基酚乙氧基化物是导致本研究中观察到的所有材料均表现出超亲水表面性质的表面活性剂，被发现是唯一的表面活性剂。降低冰在所有基材上的粘合强度。在-40℃下，无蒂液滴的体积冻结速率被测量为4.62mm 3 /秒，无蒂液滴的整个冻结过程的持续时间为10.67秒。

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  • 作者

    Kibler, Elijah Mendoza.;

  • 作者单位

    North Carolina Agricultural and Technical State University.;

  • 授予单位 North Carolina Agricultural and Technical State University.;
  • 学科 Mechanical engineering.
  • 学位 M.S.
  • 年度 2013
  • 页码 143 p.
  • 总页数 143
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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