Optimization of acoustic discharge measurement using CFD

Acoustic discharge measurement (ADM) is an accurate method for continuously measuring the flow rate in hydro plants. In unfavourable hydraulic conditions, the distorted flow profile reduces the measuring accuracy. Using numerical flow simulation (CFD), the ADM application can be optimized as is shown in two examples presented here. For an application for the Three Gorges penstock, standard ADM installations are compared with simulations. On the other hand, a witnessed model test of the Boa Ying pumping station, China, showed excellent results for an optimized ADM installation in highly disturbed flow. This could only be achieved by applying a new method which adapts the ADM installation to the simulated flow situation.