Numerical Simulation of High-Temperature Gas Flows in a Millimeter-Scale Thruster

2002 ◽  
Vol 16 (1) ◽  
pp. 10-16 ◽  
Author(s):  
A. A. Alexeenko ◽  
D. A. Levin ◽  
S. F. Gimelshein ◽  
R. J. Collins ◽  
G. N. Markelov
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Gas Flows ◽  
High Temperature Gas

Numerical simulation of high-temperature gas flows in a millimeter-scale thruster

2001 ◽  
Author(s):  
A. Alexeenko ◽  
D. Levin ◽  
S. Gimelshein ◽  
R. Collins ◽  
G. Markelov
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Gas Flows ◽  
High Temperature Gas

Numerical Simulation of Accident Scenario in High Temperature Gas Cooled (Pebble Bed) Nuclear Reactors

2012 ◽  
Author(s):  
Geoffrey J. Peter
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Boundary Conditions ◽  
Nuclear Reactors ◽  
Numerical Study ◽  
Packed Bed ◽  
Pebble Bed ◽  
Accident Scenario ◽  
Set Up ◽  
High Temperature Gas

The accident scenario resulting from blockages due to the retention of dust in the coolant gas or from the rupture of one or more fuel particles used in the High Temperature Gas Cooled (Pebble Bed) Nuclear Reactors considered for the next generation of Advanced High Temperature Reactors (AHTR), for nuclear power production, and for high-temperature hydrogen production using nuclear reactors to reduce the carbon footprint is examined in this paper. Blockages can cause local variations in flow and heat transfer that may lead to hot spots within the bed that could compromise reactor safety. Therefore, it is important to know the void fraction distribution and the interstitial velocity field in the packed bed. The blockage for this numerical study simulated a region with significantly lower void than that in the rest of the bed. Finite difference technique solved the simplified continuity, momentum, and energy equations. Any meaningful outcome of the solution depended largely upon the validity of the boundary conditions. Among them, the inlet and outlet velocity profiles required special attention. Thus, a close approximation to these profiles obtained from an experimental set-up established the boundary conditions. This paper presents the development of the elliptic-partial differential equation for a bed of pebbles, and the solution procedure. The paper also discusses velocity and temperature profiles obtained from both numerical and experimental setup, with and without effect of blockage. In addition, the paper compares the results obtained from the experimental set-up with numerical simulation using a commercially available code that uses finite element techniques.

Simultaneous Measurements of Phosphor Thermometry and PIV for High-Temperature Gas Flows

2015 ◽  
Author(s):  
Takeshi Yokomori ◽  
Haruko Nagai ◽  
Hiroshi Shiratori ◽  
Naoki Shino ◽  
Naoki Fujisawa ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Flows ◽  
Simultaneous Measurements ◽  
Phosphor Thermometry ◽  
High Temperature Gas

Evaluation of the thermal stability of composite powder materials in a plasma jet

2021 ◽  
pp. 39-43
Author(s):  
I. N. Kravchenko ◽  
Yu. A. Kuznetsov ◽  
A. L. Galinovskii ◽  
S. A. Velichko ◽  
P. A. Ionov ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Erosion Resistance ◽  
Plasma Jet ◽  
Operating Conditions ◽  
Powder Materials ◽  
Gas Flows ◽  
Sharp Change ◽  
Thermal Stability Of ◽  
High Temperature Gas

The results of studies of the thermal stability of materials operating in a plasma jet at high temperatures and a sharp change in thermal loads are presented. It has been proven that the use of plasma generators with the introduction of various powder materials makes it possible to simulate the operating conditions of parts in high-temperature gas flows with heated particles. The effect of the introduced powder materials on the thermal stability of samples prepared by plasma spraying from molybdenum, as well as tungsten and tungsten-based compositions is investigated. An installation is proposed for assessing the thermal stability of composite materials and protective hardening coatings operating under high-temperature gas flows, which makes it possible to determine their erosion resistance.

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