Impeller optimized design method capable of prolonging running down time of reactor coolant pump

Abstract

The invention relates to an impeller optimized design method capable of prolonging running down time of a reactor coolant pump. According to the impeller optimized design method, firstly, a main objective function for improving running efficiency under a running down working condition by optimizing main parameters of an impeller is established; then the main parameters are divided into three groups which are taken as design variables respectively, three subordinate objective functions are optimized respectively with a complex method for running down efficiency under initial constraint conditions, and the optimum points, guaranteeing the highest efficiency, of main geometric parameters of the impeller are obtained respectively; and a new constraint is determined in a small range nearby the optimum points, optimized solution is performed on the main objective function under the reduced new constraint with a feasible direction method, and the final optimized result is obtained. By means of design of the impeller of the reactor coolant pump, the problem of lower running down efficiency of the impeller can be improved, the running down time is prolonged, and the nuclear safety is improved. Meanwhile, with innovative application of the step-by-step optimization design method adopting constraint range reduction for subordinate objectives and optimum point searching for the main objective, the optimization speed is increased, and the effectiveness of the optimized result is guaranteed.

Description

technical field [0001] The invention relates to the field of idling efficiency analysis of a nuclear main pump and the optimization design of impeller machinery, and specifically relates to a design method for step-by-step optimization of pump impeller parameters by adopting a modern mechanical optimization design method. Background technique [0002] As an important clean energy, nuclear power has become the main source of electricity in most developed countries. The full name of the nuclear main pump is the nuclear reactor coolant main circulation pump, which is the "heart" of the nuclear power plant. Its function is to drive the high-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 steam, and drive the steam turbine to generate electricity. In the pressurized water reactor nuclear power plant, the working medium water in the primary circuit is in...

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Problems solved by technology

[0004] After retrieval, the patents related to the present invention include: a design method of the impeller of the nuclear main pump (publication number: CN102691671A), which relates to a design method of the impeller of the main pump with the core, and its design optimizes the blade thickness and wrap angle of the impeller, but Optimizing only from the thickness of the impeller blades may cause other idling operation problems; a hydraulic design method for the maximum efficiency of nuclear main pumps under loss of water accidents (CN104595232A), which provides a hydraulic design method to determine the outer diameter of the impeller, outlet The width, outlet placement angle, blade number and throat area make the nuclear main pump have a maximum efficiency point near the designed rated flow point under the loss of water accident, which improves the efficiency of the nuclear main pump under the loss of water accident, and at the same time increases the The anti-cavitation performance and operational reliability of the main pump, but this method depends on the experience of the designer, and the results will have a large deviation in the case of lack of experience

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