摘要
为构建精确的离心泵数学模型,在其机理模型基础上,利用差异演化算法自动辨识模型的参数和结构,并采用已有实验数据与该模型的残差实行修正,得到了精度较高的离心泵扬程-转速-流量模型;在该模型和已有凝水系统模型的基础上,研究某型船用凝水系统在凝水泵转速、冷凝器压力及冷凝器水位变化时的汽蚀特性。仿真结果显示:基于残差修正方法的差异演化算法可以自动生成满足计算精度和计算实时性的离心泵显式模型。在特定的运行条件下,过高的凝水泵转速、过高的冷凝器压力和过低的冷凝器水位,均会导致凝水泵汽蚀。定性和定量分析结果可以为该型船用凝水系统的设计和控制优化提供参考。
To establish an accurate mathematical model of a centrifugal pump,the structure and parameters of a centrifugal pump model were identified automatically on the basis of its mechanism model with differential evolution algorithm. The model was updated on the basis of the residual of the original test data and identification results,and the head-rotation speed-flow rate model of the centrifugal pump was obtained. Then,on the basis of the obtained model and the existing condensate system model,the simulation of the cavitation characteristics of a marine condensate system was conducted when the condensate pump rotation speed,condenser pressure,and condenser water level change. Results show that the differential evolution algorithm with residual correction can automatically generate the explicit model of the centrifugal pump,which satisfies the precision and real-time performance requirements during calculation. Moreover,under specific operating conditions,a fast condensate pump rotation speed,a high condenser pressure,and a low condenser water level will lead to cavitation of the condensate pump. The qualitative and quantitative analysis results can provide a reference for the design and control optimization of the marine condensate system.
引文
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