Reaction product fluctuations in a sphere wake
Reaction product fluctuations in a sphere wake
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球尾流中的反应产物波动
DOI：
10.2514/3.6001
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发表时间：
1968
期刊：
影响因子：
--
通讯作者：
R. Lyon
中科院分区：
文献类型：
--
作者：
C. Gibson;I. Hirschsohn;R. Lyon
在球体的反应和非反应尾流中检测到化学反应产物的波动。利用电导滴定原理，利用单电极微探针检测将乙酸和氢氧化铵溶液注入水隧道测试段中悬浮球体尾流中产生的乙酸铵的局部浓度。当反应物分别注入或预混合时，会产生反应尾流和非反应尾流。使用微型 pH 探针在反应尾流中进行测量，以估计反应程度。数据缩减是使用数字技术完成的。初步结果表明，反应尾流和非反应尾流的盐浓度分布都是非高斯分布。已在两个尾流位置计算了光谱，并且除了低波数外，反应尾流和非反应尾流具有相似的形式。在柯尔莫戈洛夫波数的约 -$$ 处观察到从惯性对流 fc~5/3 子范围到粘性对流 h~l 子范围的变化。
Fluctuations of chemical reaction product were detected in the reacting and nonreacting wake of a sphere. Using the principle of conductometric titration, a single electrode microprobe was used to detect the local concentration of ammonium acetate produced when acetic acid and ammonium hydroxide solutions were injected into the wake of a sphere suspended in the test section of a water tunnel. Reacting and nonreacting wakes were produced when the reactants were injected separately or premixed, respectively. Measurements were taken in the reacting wake with a micro-pH probe in order to have an estimate of the extent of reaction. Data reduction was accomplished using digital techniques. Preliminary results have been obtained that indicate that the distribution of the salt concentration is nongaussian for both reacting and nonreacting wakes. Spectra have been calculated at two wake positions and have similar forms for reacting and non-reacting wakes except at low wavenumber. Inflections from inertial-convective fc~5/3 subranges to viscous-convective h~l subranges were observed at about -£$ of the Kolmogoroff wavenumber.