Experimental Study of Diffusion Combustion of High-Speed Hydrogen Round Microjet Efflux from Supersonic Laval Micronozzle

2020 ◽  
Vol 29 (2) ◽  
pp. 245-253
Author(s):  
V. V. Kozlov ◽  
G. R. Grek ◽  
M. V. Litvinenko ◽  
Yu. A. Litvinenko ◽  
A. G. Shmakov
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Diffusion Combustion

Experimental study on diffusion combustion of high-speed hydrogen round microjets

2019 ◽  
Vol 44 (1) ◽  
pp. 457-468 ◽  
Author(s):  
V.V. Kozlov ◽  
G.R. Grek ◽  
G.V. Kozlov ◽  
Yu.A. Litvinenko ◽  
A.G. Shmakov
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Diffusion Combustion

scholarly journals Experimental Study of the Diffusion Combustion of a High-Speed Round Hydrogen Microjet. Part 1. Attached Flame, Subsonic Flow

2017 ◽  
Vol 12 (2) ◽  
pp. 28-45 ◽  
Author(s):  
A. G. Shmakov ◽  
◽  
G. R. Grek ◽  
V. V. Kozlov ◽  
G. V. Kozlov ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Subsonic Flow ◽  
Diffusion Combustion

Experimental Study Of The Diffusion Combustion Of A High-Speed Round Hydrogen Microjet Part 2. Lifted Flame, Supersonic Flow

2017 ◽  
Vol 12 (2) ◽  
pp. 46-59
Author(s):  
Viktor Kozlov ◽  
Genrich Grek ◽  
Maria Litvinenko ◽  
Yuriy Litvinenko ◽  
Andrey Shmakov
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Turbulent Flame ◽  
Thermal Capacity ◽  
Diffusion Combustion ◽  
Lifted Flame ◽  
Flame Region ◽  
Thin Walled ◽  
Spatial Size ◽  
Supersonic Shock

Scenario of supersonic diffusion combustion of a round hydrogen microjet is presented in this work. The main features of supersonic diffusion combustion of a hydrogen round microjet are shown: disappearance of a «bottleneck flame» region, lifted flame from the nozzle exit and existence of supersonic «shock cells» in the lifted turbulent flame. The main reason for this scenario of diffusion combustion connected with a temperature factor is found i.e. with existence of thin-walled micronozzles with a small thermal capacity and a possibility of their quenching that doesn't give the chance to exist of the «bottleneck flame» region at big speeds of a microjet efflux. It is shown that with growth of temperature of a micronozzle heating from the «bottleneck flame» region at the same speed of a microjet efflux growth of its spatial size (l/d) is found.

scholarly journals Experimental Study of the Diffusion Combustion of a High-Speed Round Hydrogen Microjet. Part 2. Lifted Flame, Supersonic Flow

2017 ◽  
Vol 12 (2) ◽  
pp. 46-59
Author(s):  
V. V. Kozlov ◽  
◽  
G. R. Grek ◽  
M. V. Litvinenko ◽  
Yu. А. Litvinenko ◽  
...  
Keyword(s):  
Experimental Study ◽  
Supersonic Flow ◽  
High Speed ◽  
Diffusion Combustion ◽  
Lifted Flame

Experimental study on laminated glass responses of high-speed trains subject to windblown sand particles loading

2021 ◽  
Vol 300 ◽  
pp. 124332
Author(s):  
Gongxun Deng ◽  
Wen Ma ◽  
Yong Peng ◽  
Shiming Wang ◽  
Song Yao ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Laminated Glass ◽  
Windblown Sand ◽  
High Speed Trains ◽  
Sand Particles

Experimental Study of Turbulent Macroinstabilities in an Agitated System with Axial High-Speed Impeller and with Radial Baffles

1996 ◽  
Vol 61 (6) ◽  
pp. 856-867 ◽  
Author(s):  
Oldřich Brůha ◽  
Ivan Fořt ◽  
Pavel Smolka ◽  
Milan Jahoda
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
High Speed ◽  
Experimental Results ◽  
Turbulent Regime ◽  
Frequency Of Occurrence ◽  
Visualization Method ◽  
Entire Flow

The frequency of turbulent macroinstability occurrence was measured in liquids agitated in a cylindrical baffled vessel. As it has been proved by preceding experimental results of the authors, the stochastic quantity with frequency of occurrence of 10-1 to 100 s-1 is concerned. By suitable choosing the viscosity of liquids and frequency of impeller revolutins, the region of Reynolds mixing numbers was covered from the pure laminar up to fully developed turbulent regime. In addition to the equipment making it possible to record automatically the macroinstability occurrence, also the visualization method and videorecording were employed. It enabled us to describe in more detail the form of entire flow field in the agitated system and its behaviour in connection with the macroinstability occurrence. It follows from the experiments made that under turbulent regime of flow of agitated liquids the frequency of turbulent macroinstability occurrence is the same as the frequency of the primary circulation of agitated liquid.

scholarly journals Study and Analysis of Anti Vibratory Passive and Active Methods Applied to Complex Mechanical System

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
Cédric Lopez ◽  
François Malburet ◽  
André Barraco
Keyword(s):  
Experimental Study ◽  
Comparative Analysis ◽  
Mechanical System ◽  
High Speed ◽  
Test Bench ◽  
Minimization Method ◽  
Controlled System ◽  
Proper Frequency ◽  
Different Parts ◽  
Methods Of Control

This paper studies problematic of a mechanical system composed of different coupled parts submitted to a high speed shock and proposes analysis of anti vibratory passive and active methods based on an experimental and theoretical coupled approach. After a shock, different parts of the system oscillate. If one of them is excited at a particular frequency, such as its proper frequency, important oscillations appear and can lead to the deterioration of the system by introducing important stresses. In this paper, we propose an analysis in order to understand this kind of problem and what we can do to avoid it. Firstly, we discuss problematic and we expose the studied system. In a second time, we develop two approaches of modeling that allow us to understand the phenomenon by carrying out numerical simulations. Then cross checking of model is completed via experimental study on drop test bench. Passive minimization method of vibrations based on experimental and theoretical coupled approach is exposed. Finally, a comparative analysis of different methods of control and experimental results of controlled system are presented.

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