Partial Confinement of Detonation Products by Shock Reflection from a Convergent Nozzle Opening

2019 ◽  
pp. 807-814
Author(s):  
Y. Schweitzer ◽  
Y. Lefler ◽  
A. Ravid ◽  
D. Sidilkover ◽  
S. Pistinner ◽  
...  
Keyword(s):  
Shock Reflection ◽  
Detonation Products ◽  
Convergent Nozzle ◽  
Partial Confinement ◽  
Nozzle Opening

Molecular dynamics and kinetic study of carbon coagulation in the release wave of detonation products

2012 ◽  
Vol 136 (8) ◽  
pp. 084506 ◽  
Author(s):  
Guillaume Chevrot ◽  
Arnaud Sollier ◽  
Nicolas Pineau
Keyword(s):  
Molecular Dynamics ◽  
Kinetic Study ◽  
Detonation Products ◽  
Release Wave

Investigation of jet impingement characteristics on primary flow of a convergent nozzle using square tab patterns

2020 ◽  
Author(s):  
Venkatesh Subramanian ◽  
Venkatesan Sorakka Ponnappan ◽  
Rakesh Vimal Maria ◽  
P. Gunasekar ◽  
P. Holy Sophia ◽  
...  
Keyword(s):  
Jet Impingement ◽  
Primary Flow ◽  
Convergent Nozzle

Study of Correctly Expanded Sonic Jet with Air Tabs

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Arun Prasad R ◽  
Thanigaiarasu S ◽  
Sembaruthi M ◽  
Rathakrishnan E
Keyword(s):  
Numerical Study ◽  
Cross Sectional ◽  
Potential Core ◽  
Convergent Nozzle ◽  
Jet Mixing ◽  
Pressure Profiles ◽  
Constant Diameter ◽  
Sonic Jet ◽  
Sectional Shape ◽  
Length Reduction

AbstractThe present numerical study is to understand the effect of air tabs located at the exit of a convergent nozzle on the spreading and mixing characteristics of correctly expanded sonic primary jet. Air tabs used in this study are two secondary jets issuing from constant diameter tubes located diametrically opposite at the periphery of the primary nozzle exit, normal to the primary jet. Two air tabs of Mach numbers 1.0 to 1.4, in steps of 0.1 are considered in this study. The mixing modification caused by air tabs are analysed by considering the mixing of uncontrolled (free) primary jet as a reference. Substantial enhancement in jet mixing is achieved with Mach 1.4 air tabs, which results in 80 % potential core length reduction. The total pressure profiles taken on the plane (YZ) normal to the primary jet axis, at various locations along the primary jet centreline revealed the modification of the jet cross sectional shape by air tabs. The stream-wise vortices and bifurcation of the primary jet caused by air tabs are found to be the mechanism behind the enhanced jet mixing.

scholarly journals The measured temperature and pressure of EDC37 detonation products

2017 ◽  
Author(s):  
J. W. Ferguson ◽  
J. C. Richley ◽  
B. D. Sutton ◽  
E. Price ◽  
T. A. Ota
Keyword(s):  
Measured Temperature ◽  
Detonation Products ◽  
Temperature And Pressure

Shock Reflection Detonation Initiation Studies for Pulse Detonation Engines

2005 ◽  
Vol 21 (6) ◽  
pp. 1117-1125 ◽  
Author(s):  
B. de Wit ◽  
G. Ciccarelli ◽  
F. Zhang ◽  
S. Murray
Keyword(s):  
Detonation Initiation ◽  
Shock Reflection ◽  
Pulse Detonation Engines ◽  
Pulse Detonation

Comparison Between the Effects of Zero and Non-Zero Flow Acceleration on the Entropy Wave Decay: An Experimental Study

2021 ◽  
Vol 143 (11) ◽  
Author(s):  
S. M. Hosseinalipour ◽  
E. Rahmani ◽  
A. Fattahi
Keyword(s):  
Hot Spot ◽  
Theoretical Models ◽  
Fast Response ◽  
Effective Length ◽  
Combustion Instabilities ◽  
Convergent Nozzle ◽  
Flow Acceleration ◽  
Wave Decay ◽  
Accelerated Flow ◽  
Effective Length Method

Abstract Entropy wave, as the convecting hot spot, is one of the sources of combustion instabilities, which is less explored through the literature. Convecting in a highly turbulent flow of a combustor, entropy waves may experience some levels of dissipation and deformation. In spite of some earlier investigations in the zero acceleration flow, the extent of the wave decay has not been clear yet. Further, there exist no results upon the wave decay in non-zero accelerated flows. This is of crucial importance, as the wave passes through the end nozzle of the combustor or gas turbine stages. The current experiment, therefore, compares the wave decay in both flow of constant and variable bulk velocity, meaning, respectively, a uniform pipe and a convergent nozzle. The comparison will aid the theoretical models to reduce complexity by simplifying the relations of non-zero acceleration flow to those of no acceleration, as followed by the earlier effective-length method. Reynolds number and inlet turbulence intensity are considered as the governing hydrodynamic parameters for both investigated flows. The entropy wave is generated by an electrical heater module and detected using fast-response thermocouples. The results show that the entropy wave variation is point-wise and frequency-dependent. The accelerated flow of the nozzle is generally found to be more dissipative in comparison with the zero acceleration flow.

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