基于Fluent的S型进气道的流场特性研究
关键词 S形进气道 数值模拟 出口动压
Title Research on flow field characteristics of S-shaped inlet duct with fluent
Abstract
A simple model and 27 different S-shaped inlet ducts composed of three centerline
curves and nine area curves has been simulated with 2D. And the total pressure,
dynamic pressure and total pressure recovery coefficient are got from the results. The
simulation results are compared and analyzed. The results showed that compared with
the streamlined inlet duct, flow separation in simple model is more serious, and the loss
of energy and the size of vortex in the corners are larger. Among streamlined inlet
ducts, with the inflection point of the center curve getting closer to the export,the
extent of the flow separation is lower. And the total pressure recovery coefficient and
dynamic pressure have improved significantly. With the inflection point of area curve
getting closer to the export, the export dynamic pressure and total pressure recovery
coefficient is reducing. To optimize the performance of the inlet duct, a reasonable
choice between centerline curve and the area curve can achieve good results.
Keywords S-shaped inlet duct numerical simulation outlet dynamic pressure
目 录
1 绪论 1
1.1 进气道概述 . 1
1.2 国内外的研究现状 . 1
1.3 本文主要研究内容 . 3
2 S 形进气道 . 4
2.1 S 形进气道的物理模型 4
2.2 S 形进气道的几何构造 4
3 数值方法 7
3.1 S 形进气管道流动控制方程 7
3.2 数值离散方法 . 8
3.3 湍流模型 . 9
3.4 S 形进气道计算模型的设置 10
3.4.1 简化的 S 形进气道模型 10
3.4.2 S 形进气道的设计 . 11
3.4.3 计算条件设置 12
3.4.4 边界条件的设置 12
4 模拟结果与分析 14
4.1 简易模型与流线型进气道的流场分析 . 14
4.2 中心线与面积变化曲线对进气道性能的影响 . 17
结 论 21
致 谢 22
参 考 文 献 23 1 绪论
1.1 进气道概述
随着人类进入二十一世纪，科技迎来高速发展，航天技术的发展更是日新月异，
世界各国在航天技术的发展上也正进行着激烈的竞争。进气道是飞行器推进系统中的
一个不可或缺的组成部分，是一个提供空气给发动机的气流通道，流入进气道的高速
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