scholarly journals The Effect of Axial Spacing of Constant and Variable Blockages on the Deflagration to Detonation Transition in a Pulse Detonation Engine

2016 ◽  
Author(s):  
Nicole Gagnon ◽  
Magdy S. Attia
Keyword(s):  
Pulse Detonation Engine ◽  
Pulse Detonation ◽  
Deflagration To Detonation Transition ◽  
Detonation Engine ◽  
Detonation Transition

Computational Study of Deflagration to Detonation Transition in Pulse Detonation Engine Using Shchelkin Spiral

2015 ◽  
Vol 772 ◽  
pp. 136-140 ◽  
Author(s):  
Pinku Debnath ◽  
Krishna Murari Pandey
Keyword(s):  
Combustion Wave ◽  
Computational Study ◽  
Pulse Detonation Engine ◽  
Flame Velocity ◽  
Pulse Detonation ◽  
Detonation Tube ◽  
Deflagration To Detonation Transition ◽  
Contour Plots ◽  
Detonation Engine ◽  
Detonation Transition

Detonation combustion wave is much more energetic combustion process in pulse detonation engine combustion system. Numerous experimental, theoretical and numerical analyses have been studied in pulse detonation engine to implement in practical propulsion system. In this present computational study the simulation was carried out for deflagration flame acceleration and deflagration to detonation transition of hydrogen air combustible mixture inside the detonation tube with and without Shchelkin spiral. A three dimensional computational analysis has been done by finite volume discretization method using ANSYS Fluent 14 CFD commercial software. The LES turbulence model with second order upwind discretization scheme was adopted with standard boundary conditions for unsteady combustion wave simulations. From the computational study it was found that intensity of detonation wave velocity and dynamic pressure is higher near to the boundary of Shchelkin spiral in detonation tube. The contour plots comparisons clearly show that deflagration flame accelerates in detonation tube as present of Shchelkin spiral. The contour plots also suggest that deflagration flame velocity and pressure are less in without Shchelkin spiral in detonation tube. The accelerating detonation waves are approximately near about Chapment-Jouguet values in detonation tube with Shchelkin spiral.

scholarly journals Computational Study on Effect of Obstacles in Pulse Detonation Engine

2018 ◽  
Vol 7 (4.5) ◽  
pp. 113
Author(s):  
Saurabh Tripathi ◽  
Krishna Murari Pandey ◽  
Pitambar Randive
Keyword(s):  
Transport Model ◽  
Computational Study ◽  
Pulse Detonation Engine ◽  
Straight Tube ◽  
Blockage Ratio ◽  
Flame Propagation Velocity ◽  
Pulse Detonation ◽  
Detonation Engine ◽  
Detonation Transition ◽  
Purge Gas

Deflagration to Detonation transition is an important factor in the operation of pulse detonation engine which is basically working on the constant volume cycle. Insertion of obstacles decreases the DDT length. Hydrogen and the oxygen-enriched air was used as fuel and oxidizer respectively. The Purge gas is not required used. K-ԑ turbulence model is being used for the simulation and for combustion species transport model is being used. Effect of blockage ratio and obstacle spacing is also discussed. A blockage ratio of 0.5 is considered for the Shchelkin spiral. Temperature profile, flame propagation velocity and average peak pressure variation are discussed. Two-dimensional geometry and Shchelkin shape of obstacles are being considered. The comparison is done between straight tube and tube with obstacles. Numerical simulation is done and the results are being compared with those obtained through experimental investigation.  

scholarly journals Detonation Transition Around Cylindrical Reflector of Pulse Detonation Engine Initiator

2013 ◽  
Vol 29 (4) ◽  
pp. 825-831 ◽  
Author(s):  
Masashi Wakita ◽  
Masayoshi Tamura ◽  
Akihiro Terasaka ◽  
Kazuya Sajiki ◽  
Tsuyoshi Totani ◽  
...  
Keyword(s):  
Pulse Detonation Engine ◽  
Pulse Detonation ◽  
Cylindrical Reflector ◽  
Detonation Engine ◽  
Detonation Transition

scholarly journals Study on Influence of Diameter on Detonation Acoustic Characteristics of Pulse Detonation Engine

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Gui-yang Xu ◽  
Chun-guang Wang ◽  
Yan-fang Zhu ◽  
Hong-yan Li ◽  
Lun-kun Gong ◽  
...  
Keyword(s):  
Acoustic Characteristic ◽  
Pulse Detonation Engine ◽  
Acoustic Characteristics ◽  
Experiment System ◽  
Pulse Detonation ◽  
Impact Noise ◽  
Maximum Duration ◽  
Detonation Engine ◽  
Set Up ◽  
Different Diameters

AbstractThe experiment system of pulse detonation engine is set up to investigate on influence of diameter on detonation acoustic characteristic. The research of detonation acoustic characteristic of pulse detonation engine for four different diameters in different angles is carried out. Results from the test show that as the PDE diameter increasing, there are increases in amplitudes of impact noise in all angles, and the growth rate of amplitude of impact noise in the 90° direction is generally greater than that in the 0° direction. The smaller PDE diameter is, the distance of most obvious directivity at 0° turning to most obvious directivity at 30° is shorter. When the distance is shorter, such as 200 mm, the duration of detonation acoustic is increasing with the increase of PDE diameter, however, when the distance is longer, such as 3000 mm, it is just the opposite. The maximum duration of detonation acoustic is appeared in 3000 mm under 30 mm PDE diameter which reaches to 1.44 ms.

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