Simultaneous measurement method for gas flow velocity and temperature fields through phosphorescent particles tracing and full-field intensity ratio calibration

doi:10.11949/0438-1157.20250473

Abstract

Abstract:

A simultaneous measurement method for high-temperature gas flow velocity and temperature fields is developed based on phosphorescent particle tracing and full-field intensity ratio calibration. BaMgAl₁₀O₁₇∶Eu²⁺ (BAM∶Eu) phosphorescent particles are employed as dual-function tracers for both flow visualization and temperature sensing. The velocity field is extracted through cross-correlation analysis of time-sequenced phosphorescent images, while the temperature field is reconstructed using the intensity ratio method applied to dual-wavelength phosphorescent images. A dual-channel imaging system is developed based on the excitation spectral characteristics of BAM:Eu particles. To compensate for spatial non-uniformity in the optical response, a full-field calibration method is proposed, establishing a high-resolution temperature calibration database over the range of 27—500℃. To evaluate the feasibility of this method, a high-temperature air free jet experiment platform was built, and simultaneous measurement experiments were conducted under different operating conditions. Experimental results demonstrate that, within the temperature range of 100—500℃ and velocity range of 15—40 m/s, the relative error and relative standard deviation are below 0.98% and 1.17% for temperature measurements, and below 1.89% and 2.84% for velocity measurements, respectively.

Key words: gas, phosphorescent particle, tracing, intensity ratio thermometry, PIV, imaging

摘要：

提出了一种基于磷光粒子示踪与全场强度比标定的高温气流流场温度场同步测量方法，采用BaMgAl₁₀O₁₇∶Eu²⁺（BAM∶Eu）磷光粒子同时作为流体的示踪与示温介质，通过对磷光时序图像进行互相关分析提取速度场信息，并基于双波段磷光图像的强度比法重建温度场。结合磷光粒子的激发光谱特性，构建了双波段磷光图像采集系统，并针对成像系统空间响应不均匀性，提出了全场强度比温度标定方法，建立了覆盖27~500℃的精细化温度标定数据库。为评估该方法的可行性，搭建了高温空气圆管自由射流实验平台，开展了不同工况下的同步测量实验。实验结果表明，在100~500℃和15~40 m/s范围内，温度测量的相对误差和相对标准偏差分别小于0.98%和1.17%，速度测量分别小于1.89%和2.84%。

关键词: 气体, 磷光粒子, 示踪, 强度比测温, 粒子图像测速, 成像

CLC Number:

TK 124

Manfu CHEN, Xi WANG, Jian LI, Biao ZHANG, Chuanlong XU. Simultaneous measurement method for gas flow velocity and temperature fields through phosphorescent particles tracing and full-field intensity ratio calibration[J]. CIESC Journal, 2025, 76(11): 5776-5787.

陈满福, 王曦, 李健, 张彪, 许传龙. 基于磷光粒子示踪与全场强度比标定的高温气流流场温度场同步测量方法[J]. 化工学报, 2025, 76(11): 5776-5787.

Figures/Tables 15

Fig.1 Simultaneous measurement principle for gas flow velocity and temperature fields through phosphorescent particles tracing

Fig.2 Displacement calculation principle of phosphor particles based on cross-correlation algorithm

Fig.3 Thermal quenching characteristics of phosphor spectral intensity

Fig.4 Temperature measurement principle based on phosphor spectral intensity ratio method

Table 1 Physical property parameters of BAM∶Eu phosphorescent particles

密度ρ_p/（g/cm³）	热导率k_p/(W/(m·K))	比热容C_p,_p/(J/(kg·K))	粒径d_p/μm	熔点/℃	磷光寿命τ(27℃)/μs	吸收光谱/nm
3.7	14	622.1	2	1920	1.67	250~420

Table 2 Physical property parameters of air

密度ρ_g/(kg/m³)	动力黏度μ_g/(kg/(m·s))	热导率k_g/(W/(m·K))
1.205	18.1×10^-6	2.59×10^-2

Fig.5 Schematic diagram of phosphorescence dual-wavelength image acquisition module

Fig.6 Temperature calibration platform for full-field phosphorescence spectral intensity ratio system

Fig.7 Full-field phosphorescence images at 27℃

Fig.8 Full-field spectral intensity ratio-temperature calibration results

Fig.9 Experimental setup for synchronous measurement of 2D flow and temperature field measurement in high-temperature air free jet

Table 3 Experimental condition parameters

工况编号	温度/℃	速度/(m/s)	激光脉冲时间间隔/μs	激光脉冲持续时间/ns	双曝光首帧曝光时间/μs
Case 1	100	16.29	17	7	6
Case 2	300	25.02	11	7	6
Case 3	500	33.75	8	7	6

Fig.10 Phosphorescence images at λ425 and λ466 under Case 3 conditions

Fig.11 Simultaneous measurement results under three operating conditions

Fig.12 Reproducibility test results at the centerline under three operating conditions

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