scholarly journals Experimental investigation on cellular breakup of a planar liquid sheet from an air-blast nozzle

2004 ◽  
Vol 16 (3) ◽  
pp. 625-632 ◽  
Author(s):  
Jaewan Park ◽  
Kang Y. Huh ◽  
Xianguo Li ◽  
Metin Renksizbulut
Keyword(s):  
Experimental Investigation ◽  
Liquid Sheet ◽  
Air Blast

Development and Experimental Investigation of a Tubular Combustor for Pyrolysis Oil Burning

2014 ◽  
Author(s):  
Martin Beran ◽  
Lars-Uno Axelsson
Keyword(s):  
Experimental Investigation ◽  
Gas Turbine ◽  
Droplet Size ◽  
Gas Turbines ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Heat Content ◽  
Pyrolysis Oil ◽  
Load Range ◽  
Air Blast

The growing demand for more economical and environmentally friendly power generation forces the industry to search for fuels that can replace the conventional fossil fuels. This has led to significant developments in the production of alternative fuels during the last years, which have made them a reliable and relatively efficient source of energy. One example of these alternative fuels is the pyrolysis oil. However, higher viscosity, lower heat content, limited chemical stability and its ability to create sediment make pyrolysis oil challenging for gas turbines. The OPRA OP16 gas turbine is an all radial single-shaft gas turbine rated at 1.9 MW. The all radial design, together with the lack of intricate cooling geometries in the hot section, makes this gas turbine suitable for operation on these fuels. This paper presents an experimental investigation of pyrolysis oil combustion in a tubular combustor developed especially for low-calorific fuels. The experiments have been performed in an atmospheric combustion test rig and the results have been compared to the results obtained from ethanol and diesel combustion. It was found that it was possible to burn pure pyrolysis oil in the load range between 70 to 100% with a combustion efficiency exceeding 99% and without creation of sediments on the combustor inner wall. It was found that the NOx emissions were similar for pyrolysis oil and diesel, whereas the CO emissions were twice as high for pyrolysis oil. A comparison between the air blast nozzle and the pressure nozzle was performed. The air blast nozzle was found to be more suitable due to its better performance over a wider operating range and that it is more resistant to erosion and abrasion. It was found that the maximum allowed droplet size of the pyrolysis oil spray should be about 50–70% of the droplet size for diesel fuel.

Break-Up Length and Spreading Angle of Liquid Sheets Formed by Splash Plate Nozzles

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
M. Ahmed ◽  
N. Ashgriz ◽  
H. N. Tran
Keyword(s):  
Experimental Investigation ◽  
Flow Velocity ◽  
Liquid Sheet ◽  
Operating Conditions ◽  
Nozzle Diameter ◽  
Empirical Correlation ◽  
Liquid Viscosity ◽  
Liquid Sheets ◽  
Break Up ◽  
Semi Empirical

An experimental investigation is conducted to determine the effect of liquid viscosity and density, nozzle diameter, and flow velocity on the break-up length and spreading angle of liquid sheets formed by splash plate nozzles. Various mixtures of corn syrup and water were used to obtain viscosities in the range of 1–170 mPa s. Four different splash plate nozzle diameters of 0.5 mm, 0.75 mm, 1 mm, and 2 mm, with a constant plate angle of 55 deg were tested. The liquid sheet angles and the break-up lengths were measured at various operating conditions. An empirical correlation for the sheet spreading angle and a semi-empirical correlation for the sheet break-up lengths are developed.

Experimental investigation of cavity stability for a gas-jet penetrating into a liquid sheet

2015 ◽  
Vol 27 (8) ◽  
pp. 082106 ◽  
Author(s):  
Qi Liu ◽  
Wenyu Chen ◽  
Liang Hu ◽  
Haibo Xie ◽  
Xin Fu
Keyword(s):  
Experimental Investigation ◽  
Liquid Sheet ◽  
Gas Jet ◽  
Cavity Stability

Numerical Investigation of the Unstable Wave on a Planar Liquid Sheet Produced by an Air-Blast Atomizer

2014 ◽  
Author(s):  
Hua Zhou ◽  
Chia-fon F. Lee ◽  
Timothy H. Lee
Keyword(s):  
Relative Motion ◽  
Internal Flow ◽  
Particle Method ◽  
Liquid Sheet ◽  
Shear Instability ◽  
Unstable Wave ◽  
Air Blast ◽  
Primary Breakup ◽  
Specific Frequency ◽  
Fluid Particles

The unstable surface wave on a liquid sheet produced by an air-blast atomizer during primary breakup process was investigated by numerical simulation. The results of simulation were verified by comparison of primary breakup time and breakup length with accessible experimental data reported in technical papers. The frequency characteristics of stream-wise unstable wave at different axial locations were investigated by applying Discrete Fourier Transform (DFT). It was found that when there is no disturbance induced by internal flow, there is no specific frequency which is favored by shear instability near the nozzle exit, and the characteristic frequency of the dominant wave decreases along stream-wise direction due to the decrease of relative velocity. By applying Discrete Particle Method (DPM), the motion of fluid particles inside the liquid sheet was able to be tracked, and the Lagrangian characteristics of fluid particles can be partially revealed. The growth of stream-wise unstable wave was found to possess strong spatial characteristics by investigating the pathlines and streaklines of fluid particles. A rough evaluation for the stream-wise speed of fluid particles and the propagation velocity of unstable wave showed that fluid particles move faster than unstable wave in stream-wise direction, thus, relative motion exists between fluid particles and stream-wise wave. This relative motion could lead to huge acceleration of fluid particles, which could trigger Rayleigh-Taylor (RT) instability to induce transverse disintegration. Some complex behaviors of fluid particles inside the liquid sheet were observed, e.g. eddy-like structures formed by fluid particles.

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