用于双推进剂空间推进的液体冲击喷射喷注器特性:PDI和高倍阴影成像的比较

2019/12/05   下载量： 1 次

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应用领域 航空航天
检测样本 航空
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参考标准 暂无

采用LaVision公司的ParticleMaster-Shadow系统，以及Artium公司的PDI设备对双推进剂空间推进的液体冲击喷射喷注器特性进行了测量分析。

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Impinging jet sprays are investigated in the reference case of like-doublet injector, for application to bi-propellant combustion. Green propellants are considered, namely ethanol as a fuel and hydrogen peroxide as an oxidizer, that is well represented by water. This study reports original comparisons between standard spray characterization (PDI) and high-magnification shadowgraphy of the spray (2.5 x 3.2 mm, 2.5 μm per pixel) based on short laser backlight illumination (5 ns). Shadowgraphy images describe accurately the inner spray structure and provide the size and velocity of droplets. This diagnostic is used to analyse the influence of jet momentum (driven by injection pressure) on impinging jet atomization, as well as the evolution of spray topology, drop size distribution and average diameter along the spray centreline. The application of shadowgraphy to the dense region of water and ethanol sprays shows the different atomization behaviour of these two fluids with respect to their surface tension. Elliptical droplets are characterized inside the spray, which confirms the interest of a direct visualization of droplets in such dense sprays.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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