Numerical Investigation of the Effects of Swirl-Vane Angle and Particle Size on Combustion and Flow Characteristics in a Vertical Cyclone Barrel

For water inrush induced by fracture network flow, the critical velocity of the incipient motion of sand particles was obtained, and the functional relation between critical velocity and particle size was established through a series of tests on the nonlinear flow characteristics of a filling fracture network. The influence of the particle size distribution, hydrodynamic force, and geometric features of the fracture network on the characteristics of particle loss; distribution laws; and water-sand, two-phase migration was also explored. Moreover, the interactions amongst water, movable particles, the surface of the skeleton, and fracture walls, and the formation mechanism of the flow channel were qualitatively analyzed. In addition, the change rules of the mass loss characteristics and porosity of the samples with time were tested successfully. The calculation methods of the permeability and non-Darcy factor of the filling fracture network were also determined.

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Experimental and Numerical Investigation of a Longfin Inshore Squid’s Flow Characteristics

Journal of Applied Fluid Mechanics ◽

10.18869/acadpub.jafm.73.238.26166 ◽

2017 ◽

Vol 10 (1) ◽

pp. 21-30 ◽

Cited By ~ 3

Author(s):

Ali Olcay ◽

Mahdi Tabatabaei ◽

Abdülkerim Okbaz ◽

Hasan Heperkan ◽

Erhan Fırat ◽

...

Keyword(s):

Numerical Investigation ◽

Flow Characteristics

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Reduced NOx Emissions Using Low Radial Swirler Vane Angles

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/91-gt-363 ◽

1991 ◽

Cited By ~ 1

Author(s):

H. S. Alkabie ◽

G. E. Andrews

Keyword(s):

Gas Turbines ◽

Fuel Injection ◽

Combustion Efficiency ◽

Inlet Temperature ◽

Nox Emissions ◽

Primary Zone ◽

Industrial Gas Turbines ◽

Curved Blade ◽

Swirl Vane ◽

Vane Angle

The influence of vane angle and hence swirl number of a radial swirler on the weak extinction, combustion inefficiency and NOx emissions was investigated at lean gas turbine combustor primary zone conditions. A 140mm diameter atmospheric pressure low NOx combustor primary zone was developed with a Mach number simulation of 30% and 43% of the combustor air flow into the primary zone through a curved blade radial swirler. The range of radial swirler vane angles was 0–60 degrees and central radially outward fuel injection was used throughout with a 600K inlet temperature. For zero vane angle radially inward jets were formed that impinged and generated a strong outer recirculation. This was found to have much lower NOx characteristics compared with a 45 degree swirler at the same pressure loss. However, the lean stability and combustion efficiency in the near weak extinction region was not as good. With swirl the central recirculation zone enhanced the combustion efficiency. For all the swirl vane angles there was little difference in combustion inefficiency between the swirlers. However, the NOx emissions were reduced at the lowest swirl angles and vane angles in the range 20–30 degrees were considered to be the optimum for central injection. NOx emissions for central injection as low as 5ppm at 15% oxygen and 1 bar were demonstrated for zero swirl and 20 degree swirler vane angle. This would scale to well under 25 ppm at pressure for all current industrial gas turbines.

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