Waves propagation in centrifugal pumps. Comparison of transfer matrices in various tests conditions

摘要

In the last years, many studies have been realized in order to get a better knowledge of turbopumps hydroacoustical behaviour. For that purpose, the pumps manufacturers as well as the pumps users need to know, with maximum of accuracy, the hydroacoustical transfer matrices and the associated hydroacoustical sources in various operating conditions [3]. Up to now, the whole determination is only possible with help of experimental investigations and remains very difficult and hard to implement because a lot of independent tests have to be performed. From an economic point of view, it's very interesting to limit the number of tests and their duration and to try to get a maximum of information with help of numerical models. The paper presents the main results of an experimental research program, devoted to the determination of hydroacoustical transfer matrices of single volute centrifugal pumps. Tests in air and in water have been performed, in collaboration with "Electricite de France" and the "Laboratoire de Mecanique de Lille". The results show that the transfer matrices appear to be nearly independent of the operating conditions and that measurements in standstill conditions can even be used in order to get a good evaluation of these matrices in a large frequency range.