scholarly journals Kinetic Modeling Study on the Combustion Characterization of Synthetic C3 and C4 Alcohols for Lean Premixed Prevaporized Combustion

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5473
Author(s):  
Solmaz Nadiri ◽  
Paul Zimmermann ◽  
Laxmi Sane ◽  
Ravi Fernandes ◽  
Friedrich Dinkelacker ◽  
...  
Keyword(s):  
Burning Velocity ◽  
Electrical Energy ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Synthetic Fuels ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Lean Premixed ◽  
Lean Fuel

To reach sustainable aviation, one approach is to use electro-fuels (e-fuels) within the gas turbine engines. E-fuels are CO2-neutral synthetic fuels which are produced employing electrical energy generated from renewable resources, where the carbon is taken out of the atmosphere or from biomass. Our approach is, to find e-fuels, which can be utilized in the lean premixed prevaporized (LPP) combustion, where most of the non-CO2 emissions are prevented. One of the suitable e-fuel classes is alcohols with a low number of carbons. In this work, the autoignition properties of propanol isomers and butanol isomers as e-fuels were investigated in a high-pressure shock tube (HPST) at temperatures from 1200 to 1500 K, the pressure of 10 bar, and lean fuel-air conditions. Additional investigations on the low-temperature oxidation and flame speed of C3 and C4 alcohols from the literature were employed to develop a comprehensive mechanism for the prediction of ignition delay time (IDT) and laminar burning velocity (LBV) of the above-mentioned fuels. A numerical model based on newly developed chemical kinetics was applied to further study the IDT and LBV of fuels in comparison to the Jet-A surrogate at the engine-related conditions along with the emissions prediction of the model at lean fuel-air conditions.

The Development of a Lean-Premixed Trapped Vortex Combustor

2003 ◽  
Author(s):  
Jonathan Bucher ◽  
Ryan G. Edmonds ◽  
Robert C. Steele ◽  
Donald W. Kendrick ◽  
Blake C. Chenevert ◽  
...  
Keyword(s):  
Applied Sciences ◽  
Bluff Body ◽  
Combustion Efficiency ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Oxides Of Nitrogen ◽  
Elevated Pressures ◽  
Lean Premixed ◽  
Lean Fuel ◽  
Trapped Vortex

A lean-premixed trapped vortex combustor (TVC) has been developed and tested. The TVC was fired on methane and tested at the General Applied Sciences Laboratory (GASL). Additionally, for baseline data, a simple bluff body combustor was tested. All testing was performed at elevated pressures and inlet temperatures and at lean fuel-air ratios representative of power generation gas turbine engines. Both bluff body and TVC data showed competitive oxides of nitrogen (NOx) emissions of <25 ppm (corrected to 15% oxygen dry condition), which served as a basis for future optimization. Combustion efficiency was routinely above 99.5%. An optimized version of the TVC incorporating flame stabilizing features displayed promising emissions: NOx/CO/UHC levels were optimized to as low as 9/9/0ppm (corrected to 15% O2 dry), with corresponding combustion efficiency above 99.9%. Because of this configuration’s robust and straightforward design, it has the potential for successful integration into a prototype engine. This paper describes the combustors, their testing and the evaluation of the test results.

scholarly journals HEAT AND EROSION-RESISTANT NANOSTRUCTURED COATINGS FOR GAS TURBINE ENGINES

Aviation ◽  
2013 ◽  
Vol 17 (4) ◽  
pp. 137-144 ◽  
Author(s):  
Aleksandrs Urbahs ◽  
Konstantins Savkovs ◽  
Margarita Urbaha ◽  
Kristine Carjova
Keyword(s):  
Gas Turbine ◽  
Oxidation Process ◽  
Sample Surface ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Functional Coatings ◽  
Temperature Oxidation ◽  
Plasma Sputtering ◽  
Ion Plasma ◽  
Basic Features

This work analyses the characteristics of functional coatings obtained by vacuum ion-plasma sputtering. These coatings have three-layer multiphase structure created as a result of condensing aluminium and titanium according to a certain programme. The article presents the results of investigation into the heat-resistance of ion-plasma coatings based on Ti-Al-N for titanium alloy parts of gas turbine engines. Analysis of the oxidation process between a sample surface and coatings within the range of 500–825 °C was carried out. The basic features of the process of coating destruction under high-temperature oxidation conditions were determined by means of scanning electron microscopy. The results of the tests made it possible to state that the coatings developed are able to operate at temperatures of 600–750 °C.

Development of a Lean-Premixed Two-Stage Annular Combustor for Gas Turbine Engines

1994 ◽  
Author(s):  
Fred C. Bahlmann ◽  
B. Martien Visser
Keyword(s):  
Gas Turbine ◽  
Turbine Engines ◽  
Emission Characteristics ◽  
Gas Turbine Engines ◽  
Two Stage ◽  
Low Emission ◽  
Lean Premixed ◽  
Annular Combustor

The development, from concept to hardware of a lean-premixed two-stage combustor for small gas turbine engines is presented. This Annular Low Emission Combustor (ALEC) is based on a patent of R.J. Mowill. Emission characteristics of several prototypes of this combustor under a variety of conditions are presented. It is shown that ultra-low NOx levels (< 10 ppm) can be reached with satisfactory CO levels (< 50 ppm).

In Situ Characterization of Sn–Pt/SiO2 Catalysts Used in Low Temperature Oxidation of CO

2001 ◽  
Vol 203 (1) ◽  
pp. 94-103 ◽  
Author(s):  
J.L. Margitfalvi ◽  
I. Borbáth ◽  
K. Lázár ◽  
E. Tfirst ◽  
A. Szegedi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxidation Of Co ◽  
In Situ Characterization ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation

The characterization of free radical reaction in coal low-temperature oxidation with different oxygen concentration

Fuel ◽  
2020 ◽  
Vol 262 ◽  
pp. 116524 ◽  
Author(s):  
Buzhuang Zhou ◽  
Shengqiang Yang ◽  
Chaojie Wang ◽  
Xincheng Hu ◽  
Wanxin Song ◽  
...  
Keyword(s):  
Free Radical ◽  
Low Temperature ◽  
Oxygen Concentration ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation

Characterization of the Bag Breakup of Liquid Drop Using High-Speed Digital In-Line Holography

2018 ◽  
Author(s):  
Longchao Yao ◽  
Jun Chen ◽  
Paul E. Sojka ◽  
Xuecheng Wu
Keyword(s):  
High Speed ◽  
Liquid Drop ◽  
Early Stage ◽  
Diagnostic Technique ◽  
Turbine Engines ◽  
Thin Wall ◽  
Gas Turbine Engines ◽  
Secondary Droplets ◽  
The Relationship

Quantifying the early stage of bag-type breakup of droplet is an important way to study the mechanism of drop breakup, but remains a challenge due to the lack of spatial-temporal resolved diagnostic technique. High-speed digital in-line holography at 20 kHz is employed to characterize secondary droplets formed in bag rupture of an ethanol drop exposed in the gas stream. Droplets as small as 10 μm are resolved at the beginning of bag rupture at Weber number of 11. The velocities of secondary droplets can almost reach that of the gas stream. Then the thin wall shrinks to form wrinkles that will generate relatively larger secondary droplets with smaller velocities. Droplet diameters are statistically displayed and the relationship between velocity and diameter as well as time is analyzed. This will help the further understanding of fuel spray generation in gas turbine engines.

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