Optimal Design Method of Impeller Blade Structure of Large Turboexpander Considering Defects

Abstract

The invention aims at the impeller of a turboexpander in a large-scale air separation equipment, and in particular relates to a structural optimization design method of a blade of a large turboexpander considering defects. On the basis of the original impeller stress analysis, the present invention adds defect factors, uses the generalized regression neural network and the multi-objective optimization algorithm based on the genetic algorithm to perform genetic optimization operations on the impeller parameters, and finally obtains evenly distributed Pareto optimal solutions as the impeller blade optimization parameters , the optimization process integrates the actual working characteristics of the impeller, the overall strength and structural rigidity of the impeller are high, and the practicability is strong. Under the condition of satisfying the strength requirement of the impeller, the method reduces the stress concentration under the action of defects, improves the working life of the impeller, reduces the weight and moment of inertia of the impeller, and saves materials.

Description

technical field [0001] The invention aims at the impeller of a turboexpander in a large-scale air separation equipment, and in particular relates to a structural optimization design method of a blade of a large turboexpander considering defects. Background technique [0002] With the large-scale development of air separation plants, the demand for large turboexpanders matching them also increases. Large turboexpanders are obviously different from medium and small turboexpanders in structural design and dynamic characteristics. The impeller occupies an important position in the large turboexpander, and is the main load-bearing component. It rotates at high speed and bears the cyclical alternating loads and dynamic loads such as centrifugal force, aerodynamic force, exciting force, and foreign object impact. The working environment of the impeller is very harsh. For the impeller in a large turboexpander, the force is more complicated. During the high-speed rotation, it not on...

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Problems solved by technology

Due to the lack of consideration of the influence of defect factors, the stress value of the impeller in the defective working state is relatively high, and the actual impeller defect will change the internal flow conditions, affect the blade tip clearance, inlet guide vane and other factors, resulting in the wrong direction of blade parameter optimization In line with the actual situation, the optimal solution that simply considers the combination of parameters cannot achieve the expected quality under certain working conditions, and the performance of the impeller is seriously affected

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