Abstract
In order to improve the calculation accuracy and efficiency of the one-dimensional model for a secondary air system, and meet the requirements of accurately calculating the discharge coefficient of the rotating orifice under various conditions, the calculation model of discharge coefficient for the rotating orifice was developed using VB.NET, based on existing experimental results and empirical relationships of the published literature. A variety of influencing factors have been considered in the model, including the influence of crossflows upstream and downstream of the orifice, and the accuracy of the model was verified by comparing the experimental data. The results show that the calculation error under various complicated conditions is about 6% on average. A wide range of parameters affecting the orifice discharge coefficient have been covered by the model with a high calculation accuracy, which basically meets the requirements of engineering design. Therefore, it can be used as a general model of rotating orifices for one-dimensional simulation of the secondary air system.
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