On the highly swirling flow through a confined bluff-body

2020 ◽  
Vol 32 (5) ◽  
pp. 055105 ◽  
Author(s):  
A. V. Brito Lopes ◽  
N. Emekwuru ◽  
B. Bonello ◽  
E. Abtahizadeh
Keyword(s):  
Bluff Body ◽  
Swirling Flow ◽  
Flow Through

Measurements in turbulent swirling flow through an abrupt axisymmetric expansion

AIAA Journal ◽  
1988 ◽  
Vol 26 (6) ◽  
pp. 669-681 ◽  
Author(s):  
P. A. Dellenback ◽  
D. E. Metzger ◽  
G. P. Neitzel
Keyword(s):  
Swirling Flow ◽  
Flow Through

Swirling flow through multiple nozzles

1970 ◽  
Vol 7 (11) ◽  
pp. 1366-1369 ◽  
Author(s):  
RICHARD H. SFORZINI ◽  
JOHN E. ESSING
Keyword(s):  
Swirling Flow ◽  
Flow Through

Effect of Fuel Composition on Emissions From a Low-Swirl Burner

2007 ◽  
Author(s):  
Daniel Sequera ◽  
Ajay K. Agrawal
Keyword(s):  
Gas Turbines ◽  
Bluff Body ◽  
Swirling Flow ◽  
Flame Temperature ◽  
Operating Conditions ◽  
Pollutant Emissions ◽  
Recirculation Region ◽  
Fuel Composition ◽  
High Hydrogen ◽  
Flow Recirculation

Lean Premixed Combustion (LPM) is a widely used approach to effectively reduce pollutant emissions in advanced gas turbines. Most LPM combustion systems employ the swirling flow with a bluff body at the center to stabilize the flame. The flow recirculation region established downstream of the bluff-body brings combustion products in contact with fresh reactants to sustain the reactions. However, such systems are prone to combustion oscillations and flame flashback, especially if high hydrogen containing fuels are used. Low-Swirl Injector (LSI) is an innovative approach, whereby a freely propagating LPM flame is stabilized in a diverging flow field surrounded by a weakly-swirling flow. The LSI is devoid of the flow recirculation region in the reaction zone. In the present study, emissions measurements are reported for a LSI operated on mixtures of methane (CH4), hydrogen (H2), and carbon monoxide (CO) to simulate H2 synthetic gas produced by coal gasification. For a fixed adiabatic flame temperature and air flow rate, CH4 content of the fuel in atmospheric pressure experiments is varied from 100% to 50% (by volume) with the remainder of the fuel containing equal amounts of CO and H2. For each test case, the CO and nitric oxide (NOx) emissions are measured axially at the combustor center and radially at several axial locations. Results show that the LSI provides stable flame for a range of operating conditions and fuel mixtures. The emissions are relatively insensitive to the fuel composition within the operational range of the present experiments.

Flow through a protruding bluff body–heat and irreversibility analysis

2001 ◽  
Vol 1 (3) ◽  
pp. 209-215 ◽  
Author(s):  
S.Z Shuja ◽  
B.S Yilbas ◽  
M.O Iqbal ◽  
M.O Budair
Keyword(s):  
Bluff Body ◽  
Flow Through ◽  
Body Heat

scholarly journals Development of a Swirl and Bluff-Body Stabilized Burner for Low-NOx, Lean-Premixed Combustion

1995 ◽  
Author(s):  
Jeffery A. Lovett ◽  
Warren J. Mick
Keyword(s):  
Bluff Body ◽  
Fuel Injection ◽  
Swirling Flow ◽  
Cylindrical Tube ◽  
Inlet Temperature ◽  
Lean Premixed Combustion ◽  
Fuel Injectors ◽  
Air Mixing ◽  
Low Nox Combustion ◽  
Heavy Duty Gas Turbine

A burner configuration utilizing both swirl and bluff-body stabilization was developed and tested for dry low-NOx combustion of natural gas fuel. A multiple number of these burners can be used to make up a can combustor. The burner consisted of a central hub supporting an axial swirler and spoke-type fuel injectors mounted coaxially within a 100 mm diameter cylindrical tube. The swirl typically provided strong recirculation and mixing, while the flame was anchored physically to the center hub. Tests were conducted at typical heavy-duty gas turbine conditions of 620 K inlet temperature and 10 atmospheres pressure. Parametric studies were conducted with various configurations of the burner to determine the corresponding effects on fuel-air mixing, flame stability, and NOx and CO emissions. The results show that ultra-low NOx emissions can be obtained if the fuel injection is sufficiently well distributed. The compact flame produced by the highly mixed swirling flow results in very low CO emissions as well. The results suggest also that swirl-strength is reduced in an upstream swirler configuration.

Swirling flow through a convergent funnel

1968 ◽  
Vol 34 (3) ◽  
pp. 575-593 ◽  
Author(s):  
Graham Wilks
Keyword(s):  
Boundary Layer ◽  
Free Stream ◽  
Swirling Flow ◽  
Velocity Profiles ◽  
Flow Through

The work that follows considers the velocity profiles within the boundary layer at the wall of an arbitrarily converging funnel. The occurrence of super-velocities, i.e. components of velocity within the boundary layer exceeding their corresponding free stream component, is investigated and the relevance of such a phenomenon to the efficiency of discharge discussed.

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