在音速马赫数的突然扩展的流动中,肋骨的影响
Ambareen Khan1, Sher Afghan Khan2, Vijayanandh Raja3,4
1School of Aerospace Engineering, Universiti Sains Malaysia, Penang, Malaysia.
Heliyon
|May 9, 2024
概括
在声速下突然膨胀的管道中添加肋骨显著改变了基压和流量. 肋骨高度和侧面比例极大地影响压力,较高的肋骨和特定的位置证明是最有效的流量控制.
科学领域:
- 流体动力学 流体动力学
- 空气动力学 在空气动力学.
- 计算流体动力学的流体动力学.
背景情况:
- 在突然膨胀的管道中,流量分离和基压是至关重要的.
- 了解音速马赫数的流量发展对于各种工程应用至关重要.
- 寻求被动流量控制方法来提高空气动力学性能.
研究的目的:
- 为了研究肋骨对基础压力和流量发展在音速马赫数突然扩大的管道的影响.
- 评估肋骨几何形状 (面积比,高度) 和位置对空气动力学参数的影响.
- 分析底层的流体物理,包括结构和动动能.
主要方法:
- 使用计算流体动力学 (CFD) 模拟来建模流量.
- 对模拟参数进行了验证,对实验结果进行了验证,其管道面积比为6.25.
- 模拟了各种肋骨配置,包括具有不同比例的多条肋骨和不同高度的单条肋骨.
主要成果:
- 肋骨通常会降低底部压力,较低的尺寸比会进一步降低,较高的尺寸比会增加.
- 增加肋骨高度 (4-5毫米) 显著增加底部压力.
- 在一个直径小的管道 (18毫米),一个3毫米的肋骨在3D位置被证明是非常有效的被动控制.
结论:
- 肋骨破坏主要,形成多个较小的,这改变了流场.
- 与没有肋骨的配置相比,肋骨的存在导致乱动能量的增加.
- 肋骨在突然扩展的管道中提供了可行的被动流量控制策略,其最佳性能取决于几何和位置.
相关概念视频
Shock Waves
2.0K
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
2.0K
Steady, Laminar Flow in Circular Tubes
192
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
192
Steady, Laminar Flow Between Parallel Plates
174
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
174
Rapidly Varying Flow
60
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
60
General External Flow Characteristics
138
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
138
Bernoulli's Equation for Flow Normal to a Streamline
853
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
853


