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| Optimal design of close law for bulb tubular type turbine based on orthogonal design |
| Chen Yunliang, Xu Yong, Du Min, Yang Hua |
| State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu, Sichuan 610065, China |
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Abstract The power station of bulb tubular type turbine is the characteristics of low head and large discharge. The transient quality of unit is impacted greatly by the close law of gates and blades during the large fluctuation after load rejection. The objective function for the transient composed of the unit′s rotate speed rise, the water pressure at the gates′ front and the axial hydraulic thrust was established and corresponding weight coefficients were determined. The orthogonal design calculation suitable for multi-factor and multi-level was adopted to optimize the close law of unit. Specifying the first time of gates close, the second time, the inflection point of gates close and the close time of blades were appointed as factors. The orthogonal design calculation was implemented with four levels adopted for every factor. The results show that the transient quality such as the rotate speed rise, the water pressure at the gates′ front, the axial hydraulic thrust and the water pressure at the draft tubes′ inlet, are improved significantly under the optimal close law of gates and blades. The water hammer pressure in penstock and the vacuum degree at the draft tubes′ inlet can be decreased in the case of blades closed slowly. The rotate speed rise of unit and the axial backward thrust can be reduced notable too. A better close law can be obtained by the orthogonal design calculation so that the better transient of bulb tubular type turbine after load rejection would occur. It can provide guidance of ensuring safety and stable operation of power station.
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Received: 25 December 2014
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