An Optimal Design Method for Guide Vane Prolonging Idling Time of Nuclear Main Pump

Abstract

The invention relates to a guide vane optimized design method capable of prolonging running down time of a reactor coolant pump. According to the guide vane optimized design method, firstly, a main objective function for improving running efficiency under running down by optimizing main parameters of a radial guide vane is established; then the main parameters are divided into three groups of subordinate design variables, subordinate objective functions are optimized respectively with running down efficiency, optimized solution is performed under initial constraint conditions, and the optimum points of the performance of the parameters are obtained; and the optimum points serve as centers for determination of new constraint conditions, optimized solution is performed on the main objective function under the new constraint conditions, and the final optimized result is obtained. By means of the design of the radial guide vane of the reactor coolant pump, the problems of lower efficiency and production of secondary backflow in a running down process can be improved, the running down time is prolonged, sufficient flow passes through to cool a reactor core, and the nuclear safety is enhanced. With application of step-by-step optimization design method adopting a subordinate objective constraint random direction searching method for reduction of a constraint range and a main objective exterior penalty function method for search of the optimum points, the effectiveness of the optimized result is guaranteed, and the optimization speed is increased.

Description

technical field [0001] The invention relates to the field of idling working condition analysis and guide vane optimization design of a nuclear main pump, and specifically relates to a design method for step-by-step optimization of pump guide vane parameters by adopting a modern mechanical optimization design method. Background technique [0002] With the accelerated development of the economy, the problems of excessive resource consumption and energy shortage have become more and more prominent. As a safe, economical and clean energy with mature technology and large-scale production, nuclear power will have a lot of room for development in my country's long-term planning. The full name of the nuclear main pump is the nuclear reactor coolant main circulation pump. Its function is to drive the highly radioactive high-temperature and high-pressure water cycle in the nuclear island, transfer the heat energy of the fission of the reactor core to the steam generator to generate st...

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Problems solved by technology

[0004] After retrieval, the patents related to the present invention include: an AP1000 nuclear main pump with long and short blade guide vanes (publication number: CN203239626U), which relates to a design method for an AP1000 nuclear main pump with long and short blade guide vanes. The distance between long and short blades and the number of long and short blades are equal to effectively prevent the occurrence and development of secondary backflow, while improving efficiency and ensuring stable operation under small flow rates, but only optimizing from the guide vane blades may cause other idling operations Problem; AP1000 nuclear main pump radial guide vane hydraulic design (CN103775387A), is characterized in that combined with the particularity of the nuclear main pump spherical volute, the design method of radial guide vane and positive guide vane is adopted to meet the requirements of flow diversion and energy conversion, and at the same time The operation is stable and safe, and at the same time optimizing its set parameters can meet the requirements of less energy loss, but its hydraulic design is mostly based on empirical design, which lacks certain rigor and comprehensiveness

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