﻿ 一种变阻尼稳定伞的气动分析 Aerodynamic Analysis of a Variable Damping Stabilized Parachute

Modeling and Simulation
Vol. 08  No. 01 ( 2019 ), Article ID: 28896 , 7 pages
10.12677/MOS.2019.81005

Aerodynamic Analysis of a Variable Damping Stabilized Parachute

Kuan Zhang, Xiaoning Fu

School of Electromechanical Engineering, Xidian University, Xi’an Shaanxi

Received: Jan. 26th, 2019; accepted: Feb. 10th, 2019; published: Feb. 18th, 2019

ABSTRACT

The hose-paradrogue is prone to swing motion due to the interference of airflow during air refueling, which makes the docking process more difficult. The flexible hose-paradrogue system in flexible aerial refueling is simulated and analyzed by Computational Fluid Dynamics simulation technology, which provides reference for the design of flexible hose-cone sleeve controller and improves the controllability of flexible hose-cone sleeve system.

Keywords:Variable Damping Stabilization Umbrella, Computational Fluid Dynamics Simulation, Controllability

1. 引言

Figure 1. Structural sketch of a variable damping stabilization umbrella

2. 变阻尼稳定伞设计及伞面形状的确定

3. CFD数值模拟

3.1. 稳定伞模型

3.2. 仿真结果分析

(a) (b)

Figure 2. (a) 10-degree umbrella support size; (b) SolidWorks model of paradrogue

Figure 3. The computational domain of steady parachute flow field

(a) αs = 10˚ (b) αs = 20˚ (c) αs = 30˚

Figure 4. The shape of three conical sleeve stabilized parachutes

$\text{T}={\text{T}}_{\text{a}}-0.0065H$ (1)

$\frac{\text{p}}{{\text{P}}_{\text{a}}}={\left(\frac{\text{T}}{{\text{T}}_{a}}\right)}^{5.25588}$ (2)

$\frac{\rho }{{\rho }_{\text{a}}}={\left(\frac{\text{T}}{{\text{T}}_{a}}\right)}^{4.25588}$ (3)

Figure 5. Comparison of CFD simulation results with flight test data

4. 模拟结果与分析

$\text{D=}\frac{1}{2}{\rho }_{\infty }{\text{V}}_{\infty }{}^{2}{\text{S}}_{\text{ref}}\text{Cd}$ (4)

$\text{Cd=}\mathrm{f}\left({\text{V}}_{\infty },{\alpha }_{s}\right)$ (5)

$\text{Cd}\approx \text{f}\left({\alpha }_{\text{s}}\right)$ (6)

$\text{Cd}\approx \text{A}{\alpha }_{\text{s}}{}^{2}+B{\alpha }_{\text{s}}+C$ (7)

$\text{Cd}\approx 0.0003{\alpha }_{\text{s}}{}^{2}-\text{0}\text{.003}{\alpha }_{\text{s}}+0.65$ (8)

(a) ${\alpha }_{s}$ = 10˚ (b) ${\alpha }_{s}$ =20˚(c) ${\alpha }_{s}$ = 10˚

Figure 6. Ma = 0.5, streamline diagram of leeward section of stable umbrella

Figure 7. Resistance coefficient-velocity curve of stable parachute

Figure 8. The relationship curve between drag coefficient and brace angle of stabilized parachute

5. 总结

Aerodynamic Analysis of a Variable Damping Stabilized Parachute[J]. 建模与仿真, 2019, 08(01): 31-37. https://doi.org/10.12677/MOS.2019.81005

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