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Erosion Rate Investigation of Various Nozzle Materials in Hybrid Rocket Motors

机译:混合火箭电机中各种喷嘴材料的侵蚀速率研究

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Thrust profile is very important for rocket motors. Nozzle design is a key parameter to predict thrust profile. Increase in nozzle throat area is very important for the system performance because I_(sp) changes when the throat area changes. Pressure decreases when throat area increases and this might cause a stability problem. Mechanical and chemical erosions can occur in nozzle throat. Due to high oxidizing agents in oxidizers of hybrid rocket motors and combustion products of fuel and oxidizer, chemical erosion can be seen in hybrid rocket motor nozzles. Consequently, operating at low O/F ratios can decrease erosion rate of nozzle throat due to low oxidizing agents. Additionally, higher chamber pressure means higher erosion rates due to increase in mass fluxes and heat transfer at nozzle throat. Fuel formulation also plays an important role in reducing nozzle erosion. Metal additives such as Al and Mg significantly reduce nozzle erosion since Al_2O_3 formation decreases the mass fraction of oxidizing agents. The most important thing that decreases nozzle erosion is the selection of nozzle material. Different graphite types and molybdenum tested as nozzle material for this study.
机译:推力配置文件对火箭电机非常重要。喷嘴设计是预测推力配置文件的关键参数。喷嘴喉部区域的增加对于系统性能非常重要,因为当喉部区域发生变化时,I_(SP)会发生变化。当喉部区域增加时,压力降低,这可能导致稳定性问题。机械和化学腐蚀可以在喷嘴喉部发生。由于氧化剂的氧化剂高氧化剂和燃料和氧化剂的燃烧产物,混合火箭电机喷嘴可以看到化学腐蚀。因此,在低O / F比下操作可以降低由于低氧化剂引起的喷嘴喉部的侵蚀速率。另外,由于喷嘴喉部的质量助熔剂和热传递增加,更高的室压力是由于较高的侵蚀速率。燃料制剂也在减少喷嘴侵蚀方面发挥着重要作用。诸如Al和Mg的金属添加剂显着降低喷嘴腐蚀,因为Al_2O_3形成降低了氧化剂的质量分数。减少喷嘴侵蚀的最重要的是选择喷嘴材料。不同的石墨类型和钼测试为本研究的喷嘴材料。

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