scholarly journals Features of thermodynamic and thermal processes in hydrogen combustion units and systems on their basis

2021 ◽  
Vol 2039 (1) ◽  
pp. 012032
Author(s):  
A I Schastlivtsev ◽  
V I Borzenko
Keyword(s):  
High Temperature ◽  
Combustion Products ◽  
Hydrogen Combustion ◽  
Thermal Processes ◽  
Steam Generators ◽  
Temperature Combustion ◽  
Main Components ◽  
High Temperature Combustion

Abstract The main types and designs of hydrogen combustion units (HCU), including hydrogen-oxygen steam generators, superheaters and air heaters of various power levels, are considered. The main problems arising in the development, creation and testing of such installations are determined, including the problems of cooling the most heat-stressed units, mixing of the main components of the fuel and oxidizer, mixing of high-temperature combustion products and ballasting components, problems associated with the completeness of hydrogen combustion and ensuring safety during operation.

scholarly journals Simultaneous High-Speed Formaldehyde PLIF and Schlieren Imaging of Multiple Injections From an ECN Spray D Injector

2020 ◽  
Author(s):  
Noud Maes ◽  
Hyung Sub Sim ◽  
Lukas Weiss ◽  
Lyle Pickett
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Combustion Products ◽  
Schlieren Imaging ◽  
Multiple Injections ◽  
Soot Precursors ◽  
Planar Laser ◽  
Temperature Combustion ◽  
Polycyclic Aromatic ◽  
High Temperature Combustion

Abstract The interaction of multiple injections in a diesel engine facilitates a complex interplay between freshly introduced fuel, previous combustion products, and overall combustion. To improve understanding of the relevant processes, high-speed Planar Laser-Induced Fluorescence (PLIF) with 355-nm excitation of formaldehyde and Polycyclic Aromatic Hydrocarbon (PAH) soot precursors is applied to multiple injections of n-dodecane from Engine Combustion Network Spray D, characterized by a converging 189-μm nozzle. High-speed schlieren imaging is applied simultaneously with 50-kHz PLIF excitation to visualize the spray structures, jet penetration, and ignition processes. For the first injection, formaldehyde (as an indicator of low-temperature chemistry) is first found in the jet periphery, after which it quickly propagates through the center of the jet, towards the jet head prior to high-temperature ignition. At second-stage ignition, downstream formaldehyde is consumed rapidly and upstream formaldehyde develops into a quasi-steady structure for as long as the momentum flux from the injector continues. Since the first injection in this work is relatively short, differences to a single long injection are readily observed, ultimately resulting in high-temperature combustion and PAH structures appearing farther upstream after the end of injection. For the second injection in this work, the first formaldehyde signal is significantly advanced because of the entrained high-temperature combustion products, and an obvious premixed burn event does not occur. The propensity for combustion recession after the end of the first injection changes significantly with ambient temperature, thereby affecting the level of interaction between the first- and second injection.

Features of transformation of water projectiles moving through high-temperature combustion products

2016 ◽  
Vol 42 (3) ◽  
pp. 256-259 ◽  
Author(s):  
R. S. Volkov ◽  
M. V. Zabelin ◽  
G. V. Kuznetsov ◽  
P. A. Strizhak
Keyword(s):  
High Temperature ◽  
Combustion Products ◽  
Temperature Combustion ◽  
High Temperature Combustion

scholarly journals Двухканальный лазерный монитор для наблюдения процессов высокотемпературного горения нанопорошков металлов

2021 ◽  
Vol 47 (7) ◽  
pp. 38
Author(s):  
Ф.А. Губарев ◽  
А.В. Мостовщиков ◽  
А.П. Ильин ◽  
Л. Ли ◽  
А.И. Федоров ◽  
...  
Keyword(s):  
High Temperature ◽  
Experimental Technique ◽  
Image Acquisition ◽  
Combustion Process ◽  
Combustion Products ◽  
The Other ◽  
Powder Materials ◽  
Digital Cameras ◽  
Temperature Combustion ◽  
High Temperature Combustion

A laser monitor with two image acquisition channels based on two brightness amplifiers and two digital cameras is presented. The laser monitor makes it possible to visualize the surface of metal nanopowders during combustion simultaneously in two regions of the sample or in one region with different magnifications. The delay between the radiation pulses of the brightness amplifiers is set in such a way that the radiation of one brightness amplifier does not affect the image formed by the other brightness amplifier. The proposed experimental technique makes it possible to study the surface of samples of powder materials during high-temperature combustion, accompanied by intense glowing and scattering of combustion products. The use of two-channel visualization makes it possible to study the surface of a burning sample in more detail, in particular, to study the inhomogeneity of the combustion process.

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