使用光谱分析实现弯管中两相流含气率的预测  

Experimental Study on the Void Fraction Determination of Gas-Oil Two-Phase Flow in Elbow Based on Spectral Analysis

作　　者：车少敏 马世一 刘雪婧 殷雄 周延[1] 熊兵 李锟 李飞 CHE Shao-min;MA Shi-yi;LIU Xue-jing;YIN Xiong;ZHOU Yan;XIONG Bing;LI Kun;LI Fei(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China;School of Electronic Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]中国航发四川燃气涡轮研究院,四川成都610500 [3]西安石油大学电子工程学院,陕西西安710065

出　　处：《光谱学与光谱分析》2025年第1期231-238,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金企业创新发展联合基金重点项目(U20B2029);国家重点研发技术项目(2023YFC2810902)资助。

摘　　要：空气被夹带进入发动机润滑油系统形成油气两相流后,会严重影响润滑系统的正常运行。因此实现发动机润滑油系统中油气两相流含气率的准确和快速测量具有十分重要的意义。基于光谱匹配方法,对发动机润滑油系统在弯管处的油气两相流含气率进行了测量研究。首先使用近红外、可见光和紫外光谱仪获取油气两相流在2个流速、5个温度工况下0.10%~1.00%含气率范围(间隔0.06%)的吸光度数据并进行分析,确认油气两相流在三个波段下均有吸收,且吸收强度与含气率有关;其次提出将数据预处理结合光谱相似性测度方法并应用于弯管含气率光谱分析中,显著降低了基于原始光谱的含气率预测的最大相对误差。在近红外波段通过使用数据增强方法如中心化(center)和标准化(autoscaling)并结合光谱角余弦方法,得出新润滑油的含气率最大相对误差相对于原始光谱得到的数值从48%降低到36%。利用该方法分别在三个波段进行含气率预测,试验工况包括2个流速、5个温度,分析了两相流的温度和流速对含气率预测的影响。温度30.0℃,流速5.1 m·min^(-1)下,含气率信息在紫外波段(193.5~413.8 nm)与光谱向量的方向或形状差异的联系更为紧密,含气率预测的最大相对误差仅为6%。在近红外和可见光波段,流速或温度一定时,最大相对误差随着温度或流速的增加均有减小趋势。紫外波段下温度对含气率预测效果没有特定的影响规律,随着两相流的流速增加,含气率预测的最大相对误差有增大趋势。结果表明对于透光性较好的新润滑油,使用紫外光谱仪进行含气率数据的采集,含气率的预测选用标准化预处理结合光谱角余弦方法,得到的含气率预测最大相对误差最小。When air is entrained into the engine lubricating oil system to form an oil and gas two-phase flow,it will seriously affect the normal operation of the lubrication system.Therefore,it is very important to realize the accurate and rapid measurement of the void fraction of the oil-gas two-phase flow in the engine lubricating oil system.This paper determines the void fraction in the engine lubrication system at the elbow based on the spectral matching method.Firstly,the absorption data of oil-gas two-phase flow were obtained at two flow rates and five temperature conditions,covering a gas content range of 0.10%to 1.00%(with an interval of 0.06%).This was accomplished by utilizing near-infrared,visible,and ultraviolet spectrophotometers,followed by rigorous analysis.It was ascertained that the oil-gas two-phase flow demonstrates absorption across all three wavelengths,with the intensity of absorption being correlated to the gas content.Secondly,the data preprocessing method combined with spectral similarity measure is proposed and applied to the gas content spectral analysis of bent pipe,significantly reducing the maximum relative error of gas content prediction based on the original spectrum.Using data enhancement methods such as center and autoscaling combined with Spectral Angle Cosine methods in the near-infrared spectrum,the maximum relative error of the gas content of the new lubricating oil was reduced from 48%to 36%relative to the original spectrum.The method predicts the void fraction of gas-oil two-phase flow in three bands respectively.The experimental conditions include two flow rates and five temperatures,and the influence of the temperature and flow rate of the two-phase flow on the void fraction prediction is analyzed.At the temperature of 30.0℃and the flow rate of 5.1 m·min^(-1),the gas content information in the ultraviolet band(193.5~413.8 nm)is more closely related to the spectral feature of the direction or shape difference of the spectral vector and the maximum relative error of the gas conten

关 键 词：气液两相流 含气率 光谱分析 光谱匹配 

分 类 号：TK314[动力工程及工程热物理—热能工程]