Method for calculating the collection efficiency of a water droplet on a rotationally symmetric surface

By correcting the airflow field using a two-dimensional axisymmetric model and a Lagrange frame, the efficiency and accuracy issues in calculating the water droplet collection coefficient on the surface of a rotating axisymmetric component were resolved, achieving an efficient and accurate solution for the water droplet collection coefficient.

CN122287464APending Publication Date: 2026-06-26BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Filing Date
2026-04-22
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies for calculating the impact characteristics and collection coefficient of water droplets on the surface of rotationally axisymmetric components involve complex 3D model construction and slow calculation speed, while 2D axisymmetric calculations result in distortion of the flow field interpolation results near the axis of symmetry, leading to abnormal water droplet trajectories and failing to accurately simulate water droplet collection characteristics.

Method used

By employing a two-dimensional axisymmetric model combined with a Lagrange framework, and through boundary correction of the symmetry axis and mesh refinement, the equations of motion of the water droplet are established, the airflow field is corrected, the trajectory of the water droplet is accurately tracked, and the water droplet collection coefficient is calculated.

Benefits of technology

It improves computational efficiency, ensures computational accuracy, accurately simulates the water droplet collection coefficient, is suitable for rapid engineering calculations, and solves the problems of abnormal deviation of water droplet trajectory and mismatch of impact area.

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Abstract

This invention discloses a method for calculating the water droplet collection coefficient of a rotationally axisymmetric surface. The method includes: establishing a geometric model of a two-dimensional cross-section of the rotationally axisymmetric surface and meshing it; selecting a two-dimensional axisymmetric computational fluid dynamics model and solving for the two-dimensional axisymmetric airflow field; correcting the airflow field; establishing the force-motion equations for water droplets within a Lagrangian framework; releasing water droplets at equal intervals in the radial direction at a far-field location away from the surface; solving the motion equations for each water droplet; adding the mass flux of water droplets impacting surface micro-elements to the cumulative mass flux of that impacted micro-element; traversing the surface micro-elements and obtaining the water droplet collection coefficient of the rotationally axisymmetric surface based on the ratio of the cumulative mass flux to the theoretically maximum possible mass flux of water droplets collected by that micro-element. This method uses a two-dimensional axisymmetric approach to calculate the airflow field and water droplet collection coefficient of a rotationally axisymmetric surface, significantly reducing the number of meshes and improving computational efficiency.
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