水的饱和蒸汽压力求解方法在摩托车排放试验过程中的应用研究

Research on the Application of Solving Method of Saturated Steam Pressure of Water on Motorcycle Emission Test

摩托车排放试验过程中,需要求解试验温度下水的饱和蒸汽压力,然后计算湿度修正系数,最后计算NO_x排放量。本文旨在研究水的饱和蒸汽压力不同求解方法对NO_x计算结果的影响,重点研究了线性插值法和两种Antoine方程,并进行多次试验后分别计算湿度修正系数及NO_x排放量,三种方法计算的结果偏差小于0.1%。

During the motorcycle emission test, it is necessary to solve the saturated steam pressure of the water at the test temperature, then to calculate the humidity correction coefficient, and finally calculate the NOx emissions. The purpose of this paper is to study the effect of different solving methods for saturated steam pressure on the calculation of NOx. The linear interpolation method and two Antoine equations are studied, and the humidity correction coefficient and NOx emission are calculated after multiple tests. The deviation of calculated result is less than O. 1%.