Tunnelling and Underground Space Technology
Tunnelling and Underground Space Technology
5 years ago

Study on numerical modeling of jet fans

An overview of ways of jet fan modeling with the use of Ansys Fluent methods is presented. The theoretical models were built and validated basing on the experimental measurements made by Giesen et al. (2011). The results obtained with the all models were compared with this experimental data and next the detailed discussion was provided. A special attention was paid to the turbulence modeling, the range and the shape of the jet produced by the fan. Ansys Fluent supports three suitable approaches allowing for accurate mapping of the axial fan operation, which differ in the degree of simplification of the reality. The first approach involves modeling a fan as a volume source of momentum. All three momentum components can be set, so the fan axis can be freely oriented in the space. The second approach involves modeling a fan with known characteristic. A fan is here a 3D object, but the fan rotor is a plane surface of zero thickness. The model is more accurate, but requires a set of parameters, which should be determined by the measurements. In the third approach a fan is also modeled as a 3D object, in this case the rotor has the real spatial dimensions. This model is capable to calculate all fan features by itself, but requires more computational resources. Apart from the above the fourth fan model as a velocity inlet is willingly used. The selection of the model is dependent on data available and required minuteness of the fan representation and operation.

Publisher URL: www.sciencedirect.com/science

DOI: S0886779817309355

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