The Effect of Facility Induced Back-pressure on Rotating Detonation Combustor Operation

This paper simulates the propagation characteristics of rotating detonation wave in the plane–radial structure for mixtures of 2H2 + O2 + 3.76N2. Two-dimensional numerical simulation was modeled, and two kinds of typical flow field and corresponding operating range were obtained under various pressure conditions. Due to the influence of curvature, the detonation wave is strengthened near the outer concave boundary and weakened near the inner convex one. The pressure ratio was varied from 1.6 to 10 by varying both stagnation and back pressure for detonation parameters and flow parameters. It is found that these parameters are dependent only on stagnation pressure for higher pressure ratio. While the pressure ratio is low, the back pressure also has an effect on them. The detonation wave height initially increases and then decreases as stagnation pressure increases, and the pressure ratio has a significant effect on it for lower pressure ratio. The inlet block ratio varies slightly from 14% to 21%. The exit average Mach number has small fluctuations between 0.89 and 1.05. The exit supersonic flow ratio varies from 14% to 74%, and the peak value is gained when pressure ratio is 6. The exit pressure amplifying ratio varies from 1.45 to 1.95, and the maximum value is obtained when pressure ratio is 2.5.

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Re-Dispersion of Flocculated Nanoparticles Using Back Pressure Valve with Small Orifice Channel

IEICE Proceeding Series ◽

10.15248/proc.2.78 ◽

2014 ◽

Vol 2 ◽

pp. 78-81

Author(s):

Nobuaki Aoki ◽

Noriyoshi Manabe ◽

Tadafumi Adschiri

Keyword(s):

Back Pressure

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SENSITIVITY TO PUMPING BACK-PRESSURE IN A BULK ACOUSTIC WAVE PIEZOELECTRIC POSITIVE DISPLACEMENT MICROPUMP

Proceeding of Proceedings of CONV-14: International Symposium on Convective Heat and Mass Transfer. June 8 - 13, 2014, Kusadasi, Turkey ◽

10.1615/ichmt.2014.intsympconvheatmasstransf.500 ◽

2014 ◽

Author(s):

Ersin Sayar ◽

Bakhtier Farouk

Keyword(s):

Acoustic Wave ◽

Back Pressure ◽

Bulk Acoustic Wave ◽

Positive Displacement

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Routing Optimization with Efficient Second Order Distributed Approach Using Congestion Control Rules

International Journal of Advanced Research in Computer Science and Software Engineering ◽

10.23956/ijarcsse/v7i7/0208 ◽

2017 ◽

Vol 7 (7) ◽

pp. 363

Author(s):

Jaya Pratha Sebastiyar ◽

Martin Sahayaraj Joseph

Keyword(s):

Congestion Control ◽

Second Order ◽

Back Pressure ◽

Order Method ◽

Delay Performance ◽

Routing Optimization ◽

Distributed Approach ◽

Control Rules ◽

Primal Dual ◽

Queue Stability

Distributed joint congestion control and routing optimization has received a significant amount of attention recently. To date, however, most of the existing schemes follow a key idea called the back-pressure algorithm. Despite having many salient features, the first-order sub gradient nature of the back-pressure based schemes results in slow convergence and poor delay performance. To overcome these limitations, the present study was made as first attempt at developing a second-order joint congestion control and routing optimization framework that offers utility-optimality, queue-stability, fast convergence, and low delay. Contributions in this project are three-fold. The present study propose a new second-order joint congestion control and routing framework based on a primal-dual interior-point approach and established utility-optimality and queue-stability of the proposed second-order method. The results of present study showed that how to implement the proposed second-order method in a distributed fashion.

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Numerical Modeling of the RDE

Transactions on Aerospace Research ◽

10.2478/tar-2020-0019 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Michal Folusiak ◽

Karol Swiderski ◽

Piotr Wolański

Keyword(s):

Combustion Chamber ◽

Turbine Engine ◽

Rotating Detonation Engine ◽

University Of Technology ◽

Detonation Combustion ◽

Detonation Engine ◽

Innovative Economy ◽

Turboshaft Engine ◽

The University ◽

Rotating Detonation

AbstractThe idea of using the phenomenon of rotating detonation to propulsion has its roots in fifties of the last century in works of Adamson et al. and Nicholls et al. at the University of Michigan. The idea was recently reinvented and experimental research and numerical simulations on the Rotating Detonation Engine (RDE) are carried in numerous institutions worldwide, in Poland at Warsaw University of Technology (WUT) since 2004. Over the period 2010-2014 WUT and Institute of Aviation (IOA) jointly implemented the project under the Innovative Economy Operational Programme entitled ‘Turbine engine with detonation combustion chamber’. The goal of the project was to replace the combustion chamber of turboshaft engine GTD-350 with the annular detonation chamber.This paper is focused on investigation of the influence of a geometry and flow conditions on the structure and propagation stability of the rotating detonation wave. Presented results are in majority an outcome of the aforementioned programme, in particular authors’ works on the development of the in-house code REFLOPS USG and its application to simulation of the rotating detonation propagation in the RDE.

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