实验和数值调查的突然扩大流量在声波机数的数量
Ambareen Khan1, Parvathy Rajendran2,3, Sher Afghan Khan4
1Centre for Instructional Technology and Multimedia, Universiti Sains Malaysia, Gelugor, Penang, 11800, Malaysia.
Scientific reports
|August 6, 2025
概括
这项研究研究了使用肋骨在超声速突然扩大的方形管道中的被动控制. 直径为10毫米的矩形肋骨,面积比为3.61,显著增加了底压,为航空航天车辆设计提供了潜力.
科学领域:
- 流体动力学 流体动力学
- 航空航天工程是航空航天工程.
- 声学 声学 在声学上
背景情况:
- 突发膨胀流在弹头,火箭和导弹等弹片中很常见.
- 被动流量控制方法对于提高空气动力学性能至关重要.
研究的目的:
- 为了研究被动流量控制的有效性,在声音马赫数的突然扩展的方形管道中使用肋骨.
- 分析肋骨形状,尺寸和位置对基底阻力减轻的影响.
主要方法:
- 使用各种形状 (矩形,三角形,半圆形) 和尺寸 (6mm,8mm,10mm) 的肋骨进行被动控制的实验调查.
- 在三个面积比 (3.61,5.76,7.84) 和四个肋骨位置 (1D,2D,3D,4D) 进行测试.
- 使用实验压力数据进行基本阻力量的量化计算.
主要成果:
- 最有效的被动控制是10毫米长方形肋骨,面积比为3.61,增加基本压力近三倍.
- 一个直径6毫米的肋骨使得基压接近环境水平.
- 模拟和实验结果显示出很好的一致性.
结论:
- 用肋骨进行被动控制是一种可行的方法,可以在突然扩张的管道中增强基压.
- 在特定面积比 (3.61) 的最佳肋骨设计 (10mm矩形) 提供了显著的性能改进.
- 被动控制策略没有对流量场或在更高面积比率的性能产生负面影响.
相关概念视频
01:16Shock Waves
2.2K
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...
2.2K
01:14Free Jet
240
Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
240
01:17Steady, Laminar Flow Between Parallel Plates
333
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.
333
01:16Bernoulli's Equation for Flow Normal to a Streamline
943
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.
943
01:26General External Flow Characteristics
275
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...
275
01:07Laminar and Turbulent Flow
9.1K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
9.1K