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前置导叶预旋调节离心泵性能的数值预测与试验（Numerical Simulation and Experiment of Inlet Guide Vane Pre-whirl Regulation for Centrifugal Pump）
离心泵 预旋调节 数值模拟 试验
2009/12/28
在分析叶轮进口流态的基础上，给出了一种用于调节离心泵工况点的前置导叶水力模型设计方法，目的是通过减小离心泵在变工况条件下叶轮进口的冲击损失和回流损失来改善在非设计工况的水力性能，拓宽高效运行范围。基于SIMPLEC算法，通过数值求解Reynolds平均Navier-Stokes方程和RNG k-ε 湍流模型方程，模拟了不同预旋角度下前置导叶离心泵全流道的三维湍流流场，外特性计算结果和试验数据吻合较...
Regulation of Irrigation Canals Using a Two-Stage Linear Quadratic Reliable Control
Irrigation canals Two-stage reliable control Linear quadratic control
2009/10/12
A 2-stage discrete-time linear quadratic reliable control technique is applied to the regulation of irrigation canals. The Saint-Venant equations of open-channel flow are linearized using the Taylor s...
Has the regulation of old debts in the successor companies proven worthwhile?
agricultural co-operatives old debt, transformation
2014/3/28
The old debt problem resulting from the transformation of the agricultural co-operatives of the former GDR (German Democratic Republic) is described with respect to its evolution and its economic poli...