Demonstration of a stabilized alumina/ethanol colloidal dispersion technique for seeding high temperature air flows

ICIASF '95 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1995-07-18 DOI:10.1109/ICIASF.1995.519125

M. Wernet, G. J. Skoch, J. H. Wernet

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引用次数: 8

Abstract

Laser anemometry enables the measurement of complex flow fields via the light scattered from small particles entrained in the flow. In the study of turbomachinery, refractory seed materials are required for seeding the flow due to the high temperatures encountered. In this work we present a pH stabilization technique commonly employed in ceramic processing to obtain stable dispersions for generating aerosols of refractory seed material. By adding submicron alumina particles to a preadjusted pH solution of ethanol, a stable dispersion is obtained which when atomized produces a high quality aerosol. Commercial grade alumina powder is used with a moderate size distribution. Other metal oxide powders in various polar solvents could also be used once the point of zero charge (PH/sub pzc/) of the powder in the solvent has been determined. Laser anemometry measurements obtained using the new seeding technique are compared to measurements obtained using Polystyrene Latex (PSL) spheres as the seed material.

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用于播种高温气流的稳定氧化铝/乙醇胶体分散技术的演示

激光风速测量可以通过在流动中携带的小颗粒散射的光来测量复杂的流场。在涡轮机械的研究中，由于遇到高温，需要耐火种子材料来播种流动。在这项工作中，我们提出了一种通常用于陶瓷加工的pH稳定技术，以获得稳定的分散体，用于产生难熔种子材料的气溶胶。通过将亚微米氧化铝颗粒添加到预先调整pH值的乙醇溶液中，可以获得稳定的分散体，当雾化时产生高质量的气溶胶。商品级氧化铝粉采用中等大小的分布。一旦确定了粉末在溶剂中的零电荷点(PH/sub pzc/)，其他金属氧化物粉末也可以在各种极性溶剂中使用。采用新播种技术获得的激光风速测量结果与使用聚苯乙烯乳胶球(PSL)作为种子材料获得的测量结果进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ICIASF '95 Record. International Congress on Instrumentation in Aerospace Simulation Facilities

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