The study of a transverse jet in a supersonic cross-flow using molecular filter based diagnostics

1997 ◽  
Author(s):  
G. Elliott ◽  
A. Mosedale ◽  
M. Gruber ◽  
A. Nejad ◽  
C. Carter ◽  
...  
Keyword(s):  
Cross Flow ◽  
Transverse Jet

scholarly journals Experimental study of the flow structure in cross flows

2021 ◽  
Vol 2119 (1) ◽  
pp. 012022
Author(s):  
A S Nebuchinov
Keyword(s):  
Transverse Velocity ◽  
Cross Flow ◽  
Field Measurements ◽  
Small Degree ◽  
Transverse Component ◽  
Mixing Processes ◽  
Transverse Jets ◽  
Transverse Jet ◽  
Piv Technique ◽  
Pulsating Jet

Abstract This study investigates the development of flow and mixing processes in the stationary and impulsive transverse jets with a small degree and frequency of blowing pulsation. Velocity field measurements were carried out using the TR PIV technique. The fields of statistical moments are obtained. It is shown that when a cross flow is injected, the main flow is turbulized, while the rise of the pulsating jet depends on the outflow mode. It is shown that with an increase in the frequency of pulsations of the transverse jet, it is more strongly “pressed” against the lower wall, maximum values of the intensity of pulsations of the transverse velocity component exceed by more than 1.5 times the values of pulsations of the transverse component.

scholarly journals Structure and mixing of a transverse jet in incompressible flow

1984 ◽  
Vol 148 ◽  
pp. 405-412 ◽  
Author(s):  
J. E. Broadwell ◽  
R. E. Breidenthal
Keyword(s):  
Flow Field ◽  
Incompressible Flow ◽  
Momentum Flux ◽  
Free Stream ◽  
Normal Force ◽  
Cross Flow ◽  
Vortex Pair ◽  
Water Jet ◽  
Transverse Jet ◽  
Axial Vortex

The flow field induced by a jet in incompressible cross-flow is analysed and the results compared with those obtained in a reacting water-jet experiment. It is argued that the axial vortex pair in the flow arises from the jet momentum normal to the free stream, the momentum flux being equivalent to a normal force, i.e. to a lift.

Transverse jet injection into a supersonic turbulent cross-flow

2011 ◽  
Vol 23 (4) ◽  
pp. 046103 ◽  
Author(s):  
Z. A. Rana ◽  
B. Thornber ◽  
D. Drikakis
Keyword(s):  
Cross Flow ◽  
Jet Injection ◽  
Transverse Jet

Temporally resolved, two-line fluorescence imaging of NO temperature in a transverse jet in a supersonic cross flow

1993 ◽  
Vol 32 (36) ◽  
pp. 7532 ◽  
Author(s):  
Brian K. McMillin ◽  
Jennifer L. Palmer ◽  
Ronald K. Hanson
Keyword(s):  
Fluorescence Imaging ◽  
Cross Flow ◽  
Transverse Jet

Numerical Investigation of Transverse Jet in Supersonic Cross-Flow Using CFD Techniques

2013 ◽  
Author(s):  
P. S. Rathore ◽  
R. Thundil Karuppa Raj
Keyword(s):  
Turbulent Mixing ◽  
Pressure Ratio ◽  
Cross Flow ◽  
Wave Structure ◽  
Supersonic Combustion ◽  
Shock Wave Structure ◽  
Transverse Jet ◽  
Fuel Jet ◽  
Flow Pressure ◽  
Scramjet Engines

High speed jets in cross flows are central to fuel injection in supersonic combustion scramjet engines. In supersonic combustion scramjet engines, the sonic under expanded transverse jet of fuel is injected into a supersonic cross flow of air, where efficient mixing of fuel and air is one of the major critical issues. Due to the limited flow residence time inside the combustion chamber, the enhancement of supersonic turbulent mixing of jet fuel and cross-flow air is a critical issue in developing supersonic air-breathing engines. The accurate estimation and detailed physical understanding of the turbulent mixing mechanisms plays an important role in combustor design of scramjet engines. This numerical study aims at understanding the complex physical phenomenon involved in mixing of fuel jet and air and the associated turbulence characteristics, boundary layer capture and flow separation. In the current study the flow field resulting from the transverse injection of fuel jet into cross-flow of air is simulated numerically by solving the appropriate governing equations for a 2-dimensional flow. Numerical simulations are used to study an under-expanded jet injected into a supersonic cross flow. This study examines the flow structure, separation topology and performance characteristics of an under expanded transverse jet issuing normally into supersonic free stream. The influence of the compressibility effect on the shock wave structure and on the vortex system ahead and behind of the jet are studied by solving Favre averaged Navier Stokes (FANS) equations with SST k-ω turbulence model. The influence of the jet Mach number and jet-to-cross-flow pressure ratio on shock wave structure of the flow and jet penetration depth are studied. The simulated numerical results are compared with the experimental data available in the literature. Grid independence study is carried out for all the simulations carried out in the work to have good accurate results. It was found out that wall pressure profile of transverse jet injection for the high jet-to-cross-flow pressure ratio is predicted more accurately by the SST k-ω turbulence model. The jet penetration depth found out to be increasing with the increase in jet-to-cross-flow pressure ratio and fuel jet slot width.

Fluid Dynamics of a Transverse Jet Reactor for Zinc Aerosol Hydrolysis

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Julia Haltiwanger Nicodemus ◽  
Jane H. Davidson
Keyword(s):  
Fluid Dynamics ◽  
Flow Field ◽  
Velocity Ratio ◽  
Continuous Process ◽  
Tubular Reactor ◽  
Cross Flow ◽  
Reactor Wall ◽  
Thermochemical Cycle ◽  
Transverse Jet ◽  
Effective Velocity

A new concept for control of the flow field, and thus particle yield, in an aerosol reactor designed for the hydrolysis of Zn in the two-step Zn/ZnO solar thermochemical cycle for hydrogen production is described and evaluated. For the hydrolysis step, much attention has been given to Zn nanoscale reacting aerosols for their potential to increase conversion to ZnO and because they enable a continuous, controllable process. The success of this continuous process depends on achieving high particle yields in the reactor. A key challenge is to control the flow field in aerosol reactors to keep the particles entrained in the flow without deposition on the reactor wall. The ability of a new reactor concept based on transverse jet fluid dynamics to control the flow field and rapidly cool the Zn vapor is investigated. In the transverse jet reactor, evaporated Zn entrained in an Ar carrier gas issues vertically into the horizontal tubular reactor through which cooler H2O and Ar flow. Particles are formed in the presence of steam at ~450 K. The trajectory of the jet is controlled via the effective velocity ratio, R, which is the square root of the ratio of the kinetic energy of the jet to that of the cross-flow. A computational fluid dynamics (CFD) model indicates that the trajectory of the jet can be controlled so that the majority of the Zn mass is directed down the center of the reactor, not near the reactor walls for R = 4.25 to R = 4.5. Experimentally, maximum particle yields of 93% of the mass entering the reactor are obtained at R = 4.5.

Sign in / Sign up

Export Citation Format

Share Document