A Three Dimensional Density Field Measurement of Transonic Flow From a Square Nozzle Using Holographic Interferometry
A Three Dimensional Density Field Measurement of Transonic Flow From a Square Nozzle Using Holographic Interferometry
复制标题
利用全息干涉测量方形喷嘴跨音速流的三维密度场测量
DOI：
10.1115/1.3448897
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
J. J. Thykkuttathil
中科院分区：
文献类型：
--
作者：
L. T. Clark;D. Koepp;J. J. Thykkuttathil
测量了三维静态密度场， 用全息干涉测量法测量正方形喷管的跨音速流。这些 测量，以显示这种方法的效率， 获得准确的跨音速流动实验数据。的准确性 通过在1.89的压力比下操作喷嘴来估计测量值 其中流量应膨胀至环境压力而不会发生后膨胀 方面的影响.静态密度的标准偏差约为1 在流动的等熵（潜在核心）部分上的百分比。数据也 压力比为2.14时，后膨胀效应 重要.所描述的方法是一项重大的技术改进 在实际的干涉测量中。
The three dimensional static density field was measured for transonic flow from a square nozzle using holographic interferometry. These measurements are presented in order to show the efficiency of this method for obtaining accurate experimental data of transonic flows. The accuracy of the measurement was estimated by operating the nozzle at a pressure ratio of 1.89 where the flow should expand to the ambient pressure with no afterexpansion effects. The standard deviation in the static density was approximately 1 percent over the isentropic (potential core) part of the flow. Data are also presented for a pressure ratio of 2.14 where afterexpansion effects are important. The method described represents a significant technical improvement in practical interferometry.