Oriented shift and inverse of the daughter droplet due to the asymmetry of grand-daughter droplets of multiple emulsions in a symmetric flow field

2016 ◽  
Vol 108 (2) ◽  
pp. 021603 ◽  
Author(s):  
Jingtao Wang ◽  
Xiaoyong Wang ◽  
Mo Tai ◽  
Jing Guan
Keyword(s):  
Flow Field ◽  
Symmetric Flow ◽  
Multiple Emulsions ◽  
Daughter Droplets ◽  
The Asymmetry

Impingement of Under-Expanded Jets on a Flat Plate

1990 ◽  
Vol 112 (2) ◽  
pp. 179-184 ◽  
Author(s):  
J. Iwamoto
Keyword(s):  
Shock Wave ◽  
Flow Field ◽  
Flat Plate ◽  
Maximum Pressure ◽  
Axially Symmetric ◽  
Symmetric Flow ◽  
Reversed Flow ◽  
Pressure Distributions ◽  
Sonic Jet ◽  
Wave Forms

When an under-expanded sonic jet impinges on a perpendicular flat plate, a shock wave forms just in front of the plate and some interesting phenomena can occur in the flow field between the shock and the plate. In this paper, experimental and numerical results on the flow pattern of this impinging jet are presented. In the experiments the flow field was visualized using shadow-photography and Mach-Zehnder interferometry. In the numerical calculations, the two-step Lax-Wendroff scheme was applied, assuming inviscid, axially symmetric flow. Some of the pressure distributions on the plate show that the maximum pressure does not occur at the center of the plate and that a region of reversed flow exists near the center of the plate.

Simulation Research on Aerodynamic Characteristics of Vehicle under Steady Crosswind Based on XFlow

2014 ◽  
Vol 494-495 ◽  
pp. 138-141
Author(s):  
Shan Ling Han ◽  
Zhi Yong Li ◽  
Jin Bin Li ◽  
Ru Xing Yu
Keyword(s):  
Flow Field ◽  
Surface Pressure ◽  
Body Surface ◽  
Crucial Role ◽  
Aerodynamic Characteristics ◽  
The Body ◽  
Wake Flow ◽  
Aerodynamic Coefficient ◽  
Simulation Research ◽  
The Asymmetry

The aerodynamic characteristics of vehicle play a crucial role in steering stability, comfort and safety of vehicle. The crosswind will affect the aerodynamic characteristics of vehicle. In this paper, the aerodynamic characteristics of ASMO model under steady crosswind is simulated by XFlow software, and the changes of aerodynamic characteristics under different steady crosswind are analyzed. It turned out that the asymmetry of wake flow field is enhanced with the increasing of crosswind, and the body surface pressure of windward is amplified, the six components of aerodynamic coefficient are also increased. It is found that the vehicle aerodynamic characteristics changed obviously under steady crosswind.

ANALYSIS OF UNSTEADY CHARACTERISTICS OF THE FLOW FIELD AT HIGH ANGLE OF ATTACK

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1583-1586
Author(s):  
ZHAO LIN FAN ◽  
YUAN JING WANG ◽  
QUAN ZHOU LU
Keyword(s):  
Flow Field ◽  
Angle Of Attack ◽  
Dynamic Measurement ◽  
High Angle ◽  
High Angle Of Attack ◽  
Key Factor ◽  
The Asymmetry ◽  
Unsteady Characteristics ◽  
Energy Components

Energy components in the flow field at high angle of attack were analyzed by the dynamic measurement. The effect of the unsteadiness induced by these components on the flow was analyzed as well. The results showed that the flow itself at high angle of attack is a kind of "vortices behavior" and the effect of unsteadiness on the asymmetry of flow is relatively weak. The key factor that can essentially affect the flow at high angle of attack is the response of the dynamic unsteadiness of the vortices to the unpredictable micro-disturbance coming from near the nose of the model.

The Effect of Geometry on the Aerodynamics of a Prototype Gas Turbine Combustor

2010 ◽  
Author(s):  
Bassam Mohammad ◽  
San-Mou Jeng
Keyword(s):  
Flow Field ◽  
Gas Turbine ◽  
Flow Structure ◽  
Strong Influence ◽  
Swirling Flow ◽  
Rectangular Cross Section ◽  
Low Velocity ◽  
Significant Difference ◽  
Expansion Angle ◽  
The Asymmetry

The method of admission of the swirling flow to the combustion chamber has a strong influence on the flow field structure in Gas Turbine Combustors (GTC). Two different exit configurations are studied. The first configuration is that of a swirl cup that ends only with a splash plate such that there is a sudden unguided expansion as the flow emanates from the swirl cup. The second is a swirl cup that ends with a splash plate and an asymmetric combustion dome. Laser Doppler Velocimetry (LDV) measurements are conducted in the horizontal plane (X-Y), for both configurations, 5mm from the flare exit. Also, LDV measurements are conducted in two vertical planes passing by the combustor centerline (X-Z and Y-Z). The results reveal a significant difference in the flow structure for both configurations. The combustion dome appears to reduce the turbulence activities close to the exit of the swirl cup. In addition, the presence of the combustion dome eliminates the corner recirculation zone and the low velocity region close to the combustor walls. It is interesting to see that the asymmetry of the combustion dome (9° difference in the expansion angle on both sides) results in a significant asymmetry in the velocity magnitude as well as the turbulence activities. Moreover, the asymmetry in the combustion dome results in a tilting of the CRZ toward the surface with the higher expansion angle. The results highlight the importance of the proper and careful design of the GTC front section. The experiments are conducted in a dump combustor (rectangular cross section). To study the effect of the chamber geometry on the flow field, the base configuration is installed in an annular combustor sector and LDV measurements are conducted in the axial radial plane (X-Z). The flow field as well as the shape of the CRZ are significantly different in both cases. The CRZ height reduced by 40% with the swirl cup installed to the SAC sector. The results emphasize the strong influence of the confinement on the flow structure.

Sign in / Sign up

Export Citation Format

Share Document