考慮運行環(huán)境影響的燃?xì)廨啓C渦輪葉片輻射測溫方法研究
[Abstract]:Accurate measurement of turbine blade temperature is of great significance to ensure the safe operation of gas turbine. The radiometric temperature measurement method is generally used for turbine blade temperature measurement, and the radiation and absorption of high temperature gas around the blade, the reflection of high temperature background radiation will affect the accuracy of radiation temperature measurement. In order to improve the accuracy of on-line temperature measurement of turbine blades, a method of radiation temperature measurement for turbine blades considering the influence of operating environment is put forward in this paper. The high temperature gas around the turbine blade produces radiation itself and absorbs radiation from the blade. The design of radiation high temperature timing usually avoids the gas radiation spectrum, but with the development of multispectral temperature measurement technology and the limitation of optical devices, it is difficult to choose the measurement spectrum which is completely unaffected. In this paper, the radiation characteristics of mixed gas under high temperature and high pressure are studied, and the change of gas radiation and absorption characteristics under different working conditions is analyzed. The K distribution model is used to rearrange the sharply varying spectral absorption coefficient into a function of smooth monotone rise and a spectral window calculation method is proposed based on the HITEMP database. Compared with the existing gas radiation calculation method, this method has advantages in calculation accuracy and speed, which can correct the influence of gas on the blade temperature measurement and provide the basis for the optimum selection of measurement spectrum. The reflection of the high temperature background radiation on the turbine blade surface will directly affect the temperature measurement results. In order to solve this problem, a method for calculating radiation temperature in high temperature background is presented in this paper. In this method, the angle coefficient is used to describe the reflectance, and the mathematical model of radiation temperature measurement under the influence of reflection is established to reduce its influence on the temperature measurement results. It is difficult to solve the model directly after adding reflectance to the mathematical model of radiation temperature measurement. Based on the theory of multi-spectral temperature measurement and the improved multi-objective genetic algorithm, the model is solved in this paper, which improves the search efficiency and the calculation accuracy. It is proved that the proposed method can effectively reduce the effect of reflection on the accuracy of temperature measurement through the experiment of radiation temperature measurement of the target in the high temperature background. Because of the complexity of turbine blade working environment, the blade is affected by different reflection when rotating to different position, so it is difficult to directly obtain the reflectance. In this paper, the background radiation reflection model of turbine blade is established to accurately describe the effect of blade reflectance on the accuracy of temperature measurement. In the process of modeling, the method of high order polynomial fitting is used to replace the blade design parameters and construct the blade profile equation, which can simplify the calculation process on the premise of ensuring the calculation accuracy. At the same time, the curved grid combined with surface element method is used to analyze the reflectance of adjacent hot end parts. Compared with the simplified model, the irregular structure of the blade surface is fully considered, and the variation law of the reflectance in the working environment is accurately described. The high accuracy of the reflection model is verified by the hardware-in-the-loop simulation experiment. On the basis of the above research work, a method for measuring the radiation temperature of gas turbine blade considering the influence of operating environment is put forward. This method improves the existing data processing method of radiation temperature measurement, and adds the radiation characteristics of high temperature gas and the calculation of reflection effect of background radiation in the process of data processing, so as to reduce the influence of turbine blade operating environment in the process of temperature measurement. Improve the accuracy of temperature measurement. Finally, the uncertainty of measurement system and working environment in the process of data processing of turbine blade radiation temperature measurement is analyzed.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:TK477
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