Analysis of the Influence of Water-Vapor Correction Term on the Measurement Uncertainty of Wind Speed

Abstract

In order to explore the influence of water-vapor correction term on wind speed uncertainty, the actual measured value of wind speed by pitot tube is the research object, Firstly, the uncertainty value of the wind speed value obtained by the simplified model (discarding the water-vapor correction term) is evaluated by GUM method. Then, the MCM evaluates the uncertainty of the wind speed value obtained from the original model (including the water-vapor correction term). Finally, two kinds of the evaluation results obtained by the method are compared in the form of probability distribution graphics, and the numerical analysis is carried out. After the water-vapor correction item is discarded, the fluctuation degree and dispersion degree of the measurement result will be reduced, and the degree of reduction is 1.0988% and 1.0929%, respectively. The degree of volatility is about 25.8513% of the degree of dispersion. The degree of influence on the volatility and dispersion of the measurement result is about 0.2305% and 0.8987% of the measured value of wind speed. In the application, for the occasion of pursuing the accuracy of measured value of wind speed, it is recommended to use the original model to measure the real-time wind speed. For the occasion of the stability of the wind speed measurement result, the GUM method can be used to evaluate the uncertainty of the simplified model.