サージングの一次元モデリングとアンサンブルカルマフィルタによる流動推定

抄録

The ensemble kalman filter(Enkf) is combined with one dimensional surge model in order to improve accuracy of one dimensional surge model. In addition, flow estimation of surge is tried by this method. The analysis object of this research is a centrifugal compressor for turbocharger, which is composed of unshrouded impeller, vaneless diffuser, scroll. Experimental setup consists of a screw compressor as a power source, a turbocharger, variable capacity plenums, measurement pipes, other pipe systems. Data assimilation use unsteady pressure data measured upstream and downstream of the compressor was assimilated. The compressor performance curve for one dimensional surge model is obtained from steady measurements and three dimensional Reynolds Averaged Navier-Stokes simulations. As a result of the application of Enkf to one dimensional surge model, maximum pressure rise at surge quantitatively agrees with experimental results. However, the experimental results were not reflected in the velocity upstream of the compressor. It is possible to improve the accuracy of one dimensional surge model by applying Enkf.