One-dimensional and three-dimensional different-time-step coupling simulation method and device for multi-nozzle pelton turbine

Abstract

The invention discloses a one-dimensional and three-dimensional different-time-step coupling simulation method and device for a multi-nozzle pelton turbine. The method comprises the following steps: establishing calculation models of a one-dimensional system and a three-dimensional system of the multi-nozzle pelton turbine; determining the transient calculation time step length of the one-dimensional system and the three-dimensional system; calculating initial states and initial flow fields of the one-dimensional system and the three-dimensional system; determining whether the one-dimensional system and the three-dimensional system conform to a different-time-step coupling discrimination relation or not; if the current time step meets the different-time-step coupling judgment relation, one-dimensional and three-dimensional different-time-step coupling simulation calculation is carried out; if not, performing three-dimensional system simulation calculation; the calculation is converged; outputting and storing one-dimensional and three-dimensional system calculation data, and completing calculation at the current moment; and the step number is calculated in the preset time. According to the method, the precision requirement of transient calculation of the pelton turbine can be met, the calculation efficiency of large-scale time steps of a one-dimensional system can be integrated, and then the calculation precision and speed of the power adjusting process of the multi-nozzle pelton turbine are improved.

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