Simultaneous Measurements of Velocity Vector and Temperature in Transonic Flow by Laser-Induced Fluorescence Method

激光诱导荧光法同时测量跨音速流速度矢量和温度

• 批准号: 01850043
• 负责人: INOUE Masahiro
• 金额: $ 11.65万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01850043/
• 关键词: Visualization; Fluorescence; Internal Flow; LIF; Diagnostics; Transonic Flow; Laser

In the large-scale gas or steam turbine, the flow around the blade tip becomes transonic, and the shock waves are generated in the blade passage. These shock waves induce the boundary layer separation and the vibration of blades, which degrade the efficiency. To clarify these phenomena, the laser-induced fluorescence (LIF) method was applied for measuring the velocity and temperature of the transonic flow with atmospheric pressure. The obtained results were summarized as follows.1. The blow-down type transonic wind-tunnel was constructed, and the nozzle with rectangular cross-section was made to simulate the flow field in the transonic cascades. The LIF diagnostic system based on the argon-ion laser was also constructed.2. The prism was inserted into the resonance cavity of the argon laser to operate it with the broad-band mode. Under this condition, it was shown theoretically that the LIF intensity was inversely proportional to the temperature of the flow field. By using this, the three-. dimensional distribution of the temperature in the nozzle was measured. Also, by inserting a tunable etalon into the resonance cavity, the vertical mode of the argon laser was selected. This etalon was traversed by the stepping motor to obtain the spectral profile of the fluorescence. The velocity in the nozzle was calculated from the Doppler shift of the spectral peak of the fluorescence.3. The measured temperature and velocity were shown to agree very well with those obtained from the static pressure measurements.Present research proved that the temperature and velocity in the transonic flow-field near an atmospheric pressure could be measured with high accuracy by the LIF method.

在大型燃气轮机或汽轮机中，叶尖周围的流动是跨音速的，在叶片通道中产生激波。这些激波引起边界层分离和叶片振动，降低了效率。为了澄清这些现象，采用激光诱导荧光（LIF）法测量了大气压下跨声速流动的速度和温度。所得结果总结如下：1。构建了吹风式跨声速风洞，并制作了矩形截面的喷管来模拟跨声速叶栅内的流场。构建了基于氩离子激光器的LIF诊断系统。将棱镜插入氩气激光器谐振腔内，使其以宽带模式工作。在此条件下，理论上证明了LIF强度与流场温度成反比。通过这个，3 -。测量了喷嘴内温度的尺寸分布。通过在谐振腔中插入可调谐的标准子，选择了氩激光器的垂直模式。步进电机遍历该标准子以获得荧光的光谱轮廓。根据荧光光谱峰的多普勒频移计算出喷嘴内的流速。结果表明，测得的温度和速度与静压测量结果吻合得很好。目前的研究证明，用LIF方法可以高精度地测量大气压附近跨声速流场的温度和速度。

项目成果

井上 雅弘: "く形曲がりノズル内遷音速流のLIF法による可視化(可視化デ-タの画像処理)" 可視化情報. 10. 103-106 (1990)

Masahiro Inoue：“使用 LIF 方法可视化矩形喷嘴中的跨音速流（可视化数据的图像处理）”可视化信息。

INOUE, Masahiro: "Flow Visualization of Curved Transonic Nozzle with Rectangular Cross-section by LIF Method" J. Visualization Soc. Japan. 10-2. 103-106 (1990)

INOUE, Masahiro：“通过 LIF 方法对矩形横截面的弯曲跨音速喷嘴进行流动可视化”J. Visualization Soc。

M.Inoue: "Temperature Measurements of Transonics Nozzle Flow by Laser-induced Fluorescence Method" Proc.6th Int.Symp.Flow Visualization. (1992)

M.Inoue：“通过激光诱导荧光方法测量跨声速喷嘴流量”Proc.6th Int.Symp.Flow Visualization。

INOUE, Masahiro: "Flow Visualization of Transonic Nozzle by Laser-induced Fluorescence Method" J. Visualization Soc. Japan. 11-2. 35-38 (1991)

INOUE, Masahiro：“通过激光诱导荧光方法实现跨音速喷嘴的流动可视化”J. Visualization Soc。

井上 雅弘: "レ-ザ誘起蛍光法による曲がりノズル内遷音速二次流れの可視化" 日本機械学会第68期通常総合講演会概要集. 910-1. 302-304 (1991)

Masahiro Inoue：“使用激光诱导荧光方法可视化弯曲喷嘴中的跨音速二次流”日本机械工程师学会第 68 届大会摘要 910-1（1991 年）。