相关实验视频
Updated: Sep 13, 2025

04:58
A Rapid Method for Modeling a Variable Cycle Engine
Published on: August 13, 2019
7.7K
一个前进飞行螺旋的大规模流摄入的数值模拟)
Leone Trascinelli1, Gianluca Romani2, Liam Hanson1
1University of Bristol, Bristol BS8 1TR, United Kingdom.
The Journal of the Acoustical Society of America
|July 29, 2025
概括
电动垂直起降 (eVTOL) 飞机螺旋吸收流会显著增加宽带噪声. 这种相互作用也会产生音调侧峰,并改变下游流动力学.
科学领域:
- 航空航天工程 航空航天工程
- 声学 声学 声学 声学
- 计算流体动力学的流体动力学.
背景情况:
- 城市空中交通需要更安静,更高效的电动垂直起降 (eVTOL) 飞机.
- 了解螺旋-流相互作用对于减少eVTOL中的噪音至关重要.
研究的目的:
- 通过数值模拟和分析飞行前进飞行期间螺旋大规模流摄入的空气声学效应.
- 通过实验数据验证计算流体动力学 (CFD) 框架.
主要方法:
- 用SIMULIA PowerFLOW CFD解决器来解决流场动态和空气声学问题.
- 模拟的流摄入在一个螺旋的气之后.
- 与之前的实验活动相比,验证了数值设置.
主要成果:
- 流摄入显著增加中高频宽带噪声.
- 螺旋 - 旋的相互作用会在叶片通过频率的周围产生音色侧峰.
- 叶片-流相互作用改变了下游的流量,加剧了不对称的不稳定的叶片负载.
结论:
- 领先的边缘主导着音调噪声和低至中频宽带噪声.
- 在更高的频率下,尾行边缘噪声变得显著.
- CFD模拟为eVTOL航空声学分析提供了经过验证的框架.
相关概念视频
Typical Model Studies
441
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
441
Turbulent Flow
281
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
281
Laminar 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
Turbulent Flow: Problem Solving
186
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
186
Steady, Laminar Flow Between Parallel Plates
336
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.
336
Poiseuille's Law and Reynolds Number
7.0K
Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
7.0K

