In addition to data about the steady-state performance (efficiency, output, cavitation), laboratory tests using reduced scale models may be expected to yield information about the pulsation behaviour of a turbine. Compared to testing the prototype machine, the model test has advantages but also shortcomings. Obtaining test results early in a hydropower project is an important advantage, however, not all results may be exactly similar to the full-size prototype. This renders the timely verification of pulsation guarantees somewhat uncertain.

Perfect similarity is never achieved at the model; therefore there is always - recognized or not - a problem of interpretation. Some measured data and observations concerning pulsation phenomena are not transferable between the model and prototype machines, hence the possibility of prediction is limited. In 2013, the IEC has just launched a work group whose task would be to improve - in the future - the somewhat vague and incomplete recommendations in the pertinent standard (IEC standard 60193).

Thanks to good knowledge of the research results from the last three decades, as well as direct project experience, Hydroadviser  can provide as of today competent appraisal of model test results.