High-Speed Flow Field Measurements of Turbulent Jet Flames Undergoing Shear Layer Manipulation

2016 ◽  
Author(s):  
Holger Nawroth ◽  
Christian O. Paschereit
Keyword(s):  
Flow Field ◽  
Shear Layer ◽  
High Speed ◽  
Field Measurements ◽  
Turbulent Jet ◽  
High Speed Flow ◽  
Jet Flames ◽  
Speed Flow ◽  
Turbulent Jet Flames

scholarly journals Research on Oscillating Characteristics of the Shear Layer on the Ship Bottom with a Moonpool under the Action of the Current and Wave

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
X. H. Huang ◽  
X. L. Yao ◽  
Z. Y. Shi ◽  
W. Xiao
Keyword(s):  
Shear Layer ◽  
High Speed ◽  
Fluid Motion ◽  
Acoustic Detection ◽  
High Speed Flow ◽  
Bubble Generation ◽  
Speed Flow ◽  
The Right ◽  
The Impact ◽  
Oscillating Characteristics

For some research vessels, a sonar is installed in the moonpool, and some acoustic detection equipment are installed on the ship bottom behind the moonpool, which helps to avoid the impact of the high-speed flow. The moonpool causes the ship bottom discontinued, forming a particular shear layer oscillation. The shear layer oscillation affects the bubble generation and motion in and behind the moonpool. The sonar and acoustic equipment will malfunction when surrounded by many bubbles. However, there is almost no research on the shear layer oscillation near the moonpool. So, in this paper, by measuring the pressure near the moonpool and monitoring the fluid motion in the moonpool and bubbles’ distribution along the ship bottom, the shear layer oscillation near the moonpool is studied experimentally under the action of the incident current and wave. Furthermore, the effects of the sonar and the moonpool shape are investigated. It can be seen that the shear layer oscillation excites the fluid motion in the moonpool. The sonar forms a complicated boundary in the moonpool, resulting in the increase in the frequency of the shear layer oscillation. The shear layer propagates along the ship bottom in the form of the ship bottom wave. Clarifying the oscillating characteristics of the shear layer along the ship bottom with a moonpool is conducive to the design of moonpools in the research ships, and the detection instruments are arranged in the right place along the ship bottom, so as to make sure the detection instruments work properly and detect the marine environment more accurately.

scholarly journals Studies on the Visualization of High Speed Flow Field Using MRI with EPI method

1998 ◽  
Vol 118 (7-8) ◽  
pp. 851-859
Author(s):  
Hiroyuki Kikuchi ◽  
Noriyuki Okinaka ◽  
Yoshiaki Aoki ◽  
Naoyuki Kayukawa
Keyword(s):  
Flow Field ◽  
High Speed ◽  
High Speed Flow ◽  
Speed Flow

Method of high speed flow field influence and restrain on laser communication

2013 ◽  
Author(s):  
Li-xin Meng ◽  
Chun-hui Wang ◽  
Cun-zhu Qian ◽  
Shuo Wang ◽  
Li-zhong Zhang
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Laser Communication ◽  
High Speed Flow ◽  
Speed Flow ◽  
Field Influence

scholarly journals A Study on the Air Cavity under a Stepped Planing Hull

2019 ◽  
Vol 7 (12) ◽  
pp. 468 ◽  
Author(s):  
Dongmei Yang ◽  
Zhiyuan Sun ◽  
Yi Jiang ◽  
Zeyang Gao
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
High Speed ◽  
General Procedure ◽  
Shape Evolution ◽  
High Speed Flow ◽  
Air Cavity ◽  
Speed Flow ◽  
Wetted Area ◽  
Volume Method

Based on the FVM (finite volume method) numerical method, the flow field around the stepped planing hull in Taunton series was simulated. According to the general procedure of numerical uncertainty analysis, the numerical uncertainty in the high-speed flow field simulation of the stepped planing hull was discussed. Combined with the wave-making characteristics of the hull, the generation mechanism, shape evolution of air cavity, and the pressure distribution characteristics under the influence of the cavity, focuses on the variation of the flow around the stepped planing when the hull is in the triangle planing stage. Numerical results suggest that, as the air cavity enlarges, the cover rate of the air cavity can rise up to 77.8% of the whole wetted surface of the planing hull bottom. While, in the triangle planing stage, there is additional wetting at the aft bilge, which leads to the decrease of the air cavity rate and the increase of the wetted area. At the same time, the pressure distribution concentrates to the center of gravity.

High Speed Transient Flow in Manifolds

2019 ◽  
Author(s):  
Nicholas Findanis
Keyword(s):  
Aspect Ratio ◽  
Flow Field ◽  
High Speed ◽  
Transient Flow ◽  
Flow Distribution ◽  
Ideal Gas ◽  
Working Fluid ◽  
High Speed Flow ◽  
Speed Flow ◽  
High Speed Flows

Abstract Flows in manifolds is a ubiquitous and important area to implement flow improvements. In almost all applications of industrial pipe flows, there is the requirement to distribute the flow of fluid. There is a deficiency of studies in the area of flow distribution in manifolds with high speed flows. The present work is aimed at providing a further understanding of transient high speed flow distribution in manifolds. The different manifold configurations were analysed computationally. A comparison was focused between through the different aspect ratio manifolds. The velocity field and the eddy viscosity parameters where compared between the simulated flow models to ascertain the key features in the distributed flow field and especially, to determine the areas that showed greater flow recirculation or flow eddies and the separated flow regions. The CFD study was conducted as a high speed flow/ compressible flow regime accounting for the ideal gas dynamic model being air as the working fluid. The study showed that the transient behaviour of flow field can significantly affect distribution of the flow depending on the aspect ratio and number of branches on the manifold. Efficiency gains can be achieved in high speed flows that can be of benefit in industrial and other engineered flow applications.

Numerical Simulation of IR Seeker High-Speed Flow Field and Its Influence on Ray Transmission

2012 ◽  
Vol 32 (8) ◽  
pp. 0801002
Author(s):  
江涛 Jiang Tao ◽  
丁明松 Ding Mingsong ◽  
高铁锁 Gao Tiesuo ◽  
董维中 Dong Weizhong ◽  
方艺忠 Fang Yizhong ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
High Speed ◽  
High Speed Flow ◽  
Speed Flow

Excitation of Free Shear-Layer Instabilities for High-Speed Flow Control

AIAA Journal ◽  
2018 ◽  
Vol 56 (5) ◽  
pp. 1770-1791 ◽  
Author(s):  
Mo Samimy ◽  
Nathan Webb ◽  
Michael Crawley
Keyword(s):  
Flow Control ◽  
Shear Layer ◽  
High Speed ◽  
Free Shear Layer ◽  
High Speed Flow ◽  
Speed Flow
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