摘要:
【目的】在冰-螺旋桨切削或者碰撞试验中,使用满足几何相似和冰力学特性相似准则的模型冰对螺旋桨冰载荷的测试结果至关重要。【方法】以淡水冰、盐水冰、尿素冰、EG/AD/S冰以及石蜡模型冰为研究对象,开展不同材质模型冰的单轴压缩试验,测试和分析不同应变速率以及冷冻和回温状态下冰的压缩强度和破坏模式。【结果】在盐水冰研制过程中,采用冷冻温度为-20℃,冷冻时间为48h,回温温度为-5℃,回温时间为24h的制作的盐水冰满足冰桨接触试验要求;模型冰压缩强度由大到小的排列顺序为尿素冰、淡水冰、EG/AD/S冰、石蜡模型冰、淡水冰-回温、EG/AD/S冰-回温、盐水冰、尿素冰-回温以及盐水冰-回温。【结论】试验测试结果可为后续冰-螺旋桨切削或者碰撞试验中模型冰的选择提供参考。
Abstract:
[Objectives] In the ice-propeller milling or collision test, it is very important to use the model ice which satisfies the geometric similarity and similarity with the mechanical properties of ice to test the ice load of the propeller. [Methods] Uniaxial compression tests of model ice of different materials were carried out with freshwater ice, saltwater ice, urea ice, EG/AD/S ice and paraffin model ice as research objects. The compressive strength and failure modes of ice under different strain rates, freezing and tempering conditions were tested and analyzed. [Results] In the development process of saltwater ice, the saltwater ice made with freezing temperature of -20 ℃, freezing time of 48 h, tempering of -5 ℃ and tempering of 24 h can meet the requirements of ice-propeller contact test. The order of the compressive strength of the model ice in descending order is urea ice, freshwater ice, EG/AD/S ice, paraffin model ice, freshwater ice-tempering, EG/AD/S ice-tempering, saltwater ice, urea ice-tempering, and saltwater-tempering. [Conclusions] The test results can provide reference for the selection of model ice in subsequent ice-propeller milling or collision experiments.