Comparison of air distribution in two reduced-scale models for large workplace of hydropower station

Compares the experimental results obtained by two ventilation models with the scales of 1∶50 and 1∶20 respectively in underground main workplace of a hydropower station. Measures the whole air velocity field in 1∶50 scale model by particle image velocimetry (PIV) technology and establishes the 1∶20 scale thermal state ventilation model. The comparison and analysis results of air distribution in typical cross sections of the two models show that the maximum relative error of air velocity is 12.1% in the two models, and that there is a good agreement between 1∶50 scale model and 1∶20 scale model in whole air velocity field.