Method for analyzing parachute performance in stormy weather

Abstract

The invention discloses a method for analyzing the parachute performance in a stormy weather. The method comprises the steps of firstly establishing a filled parachute grid; secondly establishing a single raindrop SPH (Smoothed Particle Hydrodynamics) model according to experimental observation data; thirdly establishing a raindrop field through an array according to the actually measured raindrop field concentration; fourthly establishing an air flow field grid; fifthly assembling the parachute grid, the air flow field grid and the raindrop field model, and setting a boundary and an initial condition; sixthly calculating the air flow field and the raindrop field by adopting an ALE (Abitrary Lagrangian-Eulerian) method and an SPH method respectively, and calculating air-canopy coupling and raindrop-canopy contact by adopting a penalty function based contact algorithm; and finally analyzing calculation results. According to the method, the parachute performance in the stormy weather can be analyzed.

Description

technical field [0001] The invention relates to a method for analyzing the performance of a parachute in a rainstorm, and belongs to the technical field of aviation lifesaving. Background technique [0002] Parachute is an important aviation life-saving or aerodynamic deceleration equipment, and parachute design or research is mainly based on ideal weather conditions. However, in actual engineering, parachutes inevitably need to work in harsh environments, such as wartime airdrops of materials or personnel, and severe weather such as heavy rain will have an important impact on the performance of parachutes. Due to the limitations of test methods, the performance analysis of parachutes in heavy rain has always been a difficult point. [0003] However, the existing numerical methods are also difficult to analyze, because the air flow field and a single raindrop (at the mesoscopic level) belong to the category described by Euler, and the raindrop field (at the macroscopic leve...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a parachute performance analysis method in rainy weather. SPH particles are used to establish a raindrop field. The coupling of air and canopy in the process of parachute steady landing adopts the ALE method, that is, two models are used to simulate different fluids respectively. , but both the raindrop-canopy contact and the air-canopy coupling are calculated using the contact algorithm based on the penalty function, which solves the problem that the existing methods cannot simulate the air flow field and the raindrop field at the same time

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