Flow structure at a confluence: experimental data and the bluff body analogy

2016 ◽  
Vol 54 (3) ◽  
pp. 263-274 ◽  
Author(s):  
Horacio S. Herrero ◽  
Carlos M. García ◽  
Francisco Pedocchi ◽  
Guillermo López ◽  
Ricardo N. Szupiany ◽  
...  
Keyword(s):  
Experimental Data ◽  
Flow Structure ◽  
Bluff Body

scholarly journals Comparison of RANS and scale-resolving approaches when modelling the turbulent flow behind a bluff body

2019 ◽  
Vol 196 ◽  
pp. 00036
Author(s):  
Svetlana V. Pogudalina ◽  
Natalya N. Fedorova ◽  
Svetlana A. Valger
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Calculation ◽  
Turbulent Flow ◽  
Bluff Body ◽  
Air Flow ◽  
Ansys Fluent ◽  
Fluent Software

In this paper, the results of a numerical simulation of the air flow in the vicinity of a parallelepiped fixed on a plate are presented. The 3D calculations were performed with the ANSYS Fluent software using scale-resolving DES approach. The obtained results are compared with the experimental data and with the results of the previous numerical calculation.

Validation of in-cylinder flow structure of controlled auto-ignition engine

2013 ◽  
Vol 10 (4) ◽  
pp. 305-312
Author(s):  
J. Beauquel ◽  
S. Ibrahim ◽  
R. Chen
Keyword(s):  
Experimental Data ◽  
Flow Structure ◽  
Transient Flow ◽  
Laser Doppler Anemometry ◽  
Auto Ignition ◽  
Geometry Configuration ◽  
Turbulent Flow Structure ◽  
Air Intake ◽  
Exhaust Valves ◽  
Actual Geometry

Numerical calculations have been carried out to investigate the in-cylinder transient flow structure of a controlled auto-ignition (CAI) engine running at speeds of 1,500rpm and 2,000rpm. The calculated turbulent flow structure and velocities are validated against published laser doppler anemometry (LDA) experimental data. The experimental data were re-processed to represent the time dependent mean velocities for all measured points. The actual geometry configuration of the engine is imported into the computational fluid dynamics (CFD) code used in this study. The simulations take into account the movement of the inlet, exhaust valves and the piston. The CFD simulations replicate the experimental work where only air was inserted into a driven optical engine. Also, to simulate an engine in controlled auto-ignition (CAI) mode, the same valve timing that allows 36% internal exhaust gas recirculation (IEGR) was applied for the air intake. The calculated results are found to agree well with the LDA measurements with an overall agreement of 75.06% at 1,500 rpm and 73.42% at 2,000 rpm.

scholarly journals A Model for Bluff Body Flame Stabilization

1986 ◽  
Author(s):  
J. A. De Champlain ◽  
M. F. Bardon
Keyword(s):  
Experimental Data ◽  
Equivalence Ratio ◽  
Bluff Body ◽  
Laminar Flame ◽  
Flame Stabilization ◽  
Effect Of Temperature ◽  
Laminar Flame Speed ◽  
Tabular Form ◽  
Chemical Effects ◽  
Stirred Reactor

Previous work on bluff body stabilization mechanisms is reviewed, and existing models are categorized in tabular form, showing the underlying assumptions and resulting equations. Lacunae in existing models are discussed, particularly their reliance on characteristics such as laminar flame speed which is difficult to predict for the conditions encountered in turbojet afterburners. A model for bluff body flame stabilization is proposed based on the stirred reactor approach. In addition to the effect of temperature, pressure and geometry, it includes chemical effects such as vitiation and fuel-air equivalence ratio. Blow off velocities predicted by the model are compared to experimental data for various conditions.

scholarly journals A Study of Isothermal Flow Past a Confined Bluff Body

1990 ◽  
Author(s):  
M. K. Y. Lai ◽  
M. V. D’Souza ◽  
I. G. Campbell ◽  
G. J. Smallwood ◽  
D. R. Snelling
Keyword(s):  
Experimental Data ◽  
Bluff Body ◽  
Laser Sheet ◽  
Velocity Ratio ◽  
Co2 Concentration ◽  
Gas Analysis ◽  
Isothermal Flow ◽  
Numerical Predictions ◽  
Flow Past ◽  
Radial Profiles

The paper describes a preliminary assessment of a TEACH-based mathematical model, known as TURCOM, for isothermal flow past a confined bluff-body. The assessment is based on comparisons of numerical predictions with the experimental data. Laser Doppler Velocimetry (LDV) and gas analysis were used to measure radial profiles of axial velocity and CO2 concentration. Laser sheet illumination was employed to study the gross features of the flow. Depending on the jet velocity ratio, two or three recirculation zones and two well-defined stagnation points along the centerline were predicted. Agreement between the predictions and experimental data were reasonably good, but the axial location of the fuel stagnation point was under-estimated when compared with the LDV data. Flow visualization indicated vortex shedding off the edges of the bluff body, an unsteady flow phenomenon that neither TURCOM prediction nor LDV measurements could identify.

Improvement of Discharge Flow Structure by Bluff-Body Insert and Size Reduction of a Mixed-Flow Irrigation Pump

2022 ◽  
Vol 148 (3) ◽  
Author(s):  
Kittipass Wasinarom ◽  
Dachdanai Boonchauy ◽  
Jaruphant Noosomton ◽  
Jarruwat Charoensuk
Keyword(s):  
Flow Structure ◽  
Bluff Body ◽  
Size Reduction ◽  
Mixed Flow ◽  
Discharge Flow

scholarly journals A Numerical Investigation of Moment Coefficient and Flow Structure in a Rotor-Stator Cavity With Rotor Mounted Bolts

2011 ◽  
Author(s):  
Elham Roshani Moghaddam ◽  
Daniel Coren ◽  
Christopher Long ◽  
Abdulnaser Sayma
Keyword(s):  
Experimental Data ◽  
Flow Structure ◽  
Numerical Study ◽  
Research Centre ◽  
Rotating Disc ◽  
Turbine Engine ◽  
Moment Coefficient ◽  
Engine Design ◽  
Commercial Code ◽  
The Moment

This paper presents a numerical study of the effect of rotor mounted bolts on the moment coefficient and flow structure within a rotor-stator cavity representative of modern gas turbine engine design. The CFD computations are performed using the commercial code FLUENT. The simulation methodology is first validated using experimental data from plain co-rotating disc and rotor-stator cavities from the open literature. Comparisons are then made with experimental data obtained from a test rig at the Thermo Fluid Mechanics Research Centre (TFMRC), University of Sussex. Computations were performed at Reφ = 6.8 × 106, Cw = 5929 (λT = 0.35) with different numbers of bolts (0 < N < 60), and also a continuous ring, at r/b = 0.9. The study has improved the current understanding of the effect on moment coefficient and flow structure that rotor mounted protrusions have in rotor-stator systems. It is seen that the contribution of skin friction to the moment coefficient reduces as the number of bolts is increased. The size and shape of the wake created by a rotating bolt also means that the pressure loss per bolt reduces with N but the overall effect is to increase the moment coefficient because there are more bolts.

scholarly journals Effect of Fuel Flow Rate to the flow Structure and Vortex Shedding behind a Bluff Body.

2000 ◽  
Vol 66 (641) ◽  
pp. 271-279
Author(s):  
Takeshi SAITO ◽  
Yuji IKEDA ◽  
Tsuyoshi NAKAJIMA ◽  
Yoji KUROSAWA ◽  
Talashi TAMARU
Keyword(s):  
Flow Structure ◽  
Flow Rate ◽  
Vortex Shedding ◽  
Bluff Body ◽  
Fuel Flow Rate ◽  
Fuel Flow
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