Three-Dimensional Steady State Numerical Analysis of Inclined Two Phase Closed Thermosyphon for Solar Applications

2021 ◽  
Author(s):  
Linto P. Anto ◽  
James Varghese
Keyword(s):  
Steady State ◽  
Numerical Analysis ◽  
Three Dimensional ◽  
Two Phase ◽  
Solar Applications

Numerical Analysis of Erosive Wear on the Guide Vanes of a Francis Turbine

2015 ◽  
Vol 741 ◽  
pp. 531-535
Author(s):  
Hong Ming Zhang ◽  
Li Xiang Zhang
Keyword(s):  
Numerical Analysis ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Erosive Wear ◽  
Francis Turbine ◽  
Two Phase ◽  
Guide Vanes ◽  
Flow Equations ◽  
Sand Erosion ◽  
Volume Method

The paper presents the numerical analysis of erosive wear on the guide vanes of a Francis turbine using CFD code. The 3-D turbulent particulate-liquid two-phase flow equations are employed in this study. The computing domain is discretized with a full three-dimensional mesh system of unstructured tetrahedral shapes. The finite volume method is used to solve the governing equations and the pressure-velocity coupling is handled via a Pressure Implicit with Splitting of Operators (PISO) procedure. Simulation results have shown that the volume fraction of sand at the top of the guide vanes is higher than others and the maximum of volume fraction of sand is at same location with the maximum of sand erosion rate density. The erosive wear is more serious at the top of the guide vanes.

Numerical Analysis and Validation of the Rotor Blade Vibration Response Induced by High Pressure Compressor Deep Surge

2014 ◽  
Author(s):  
Thomas Giersch ◽  
Felix Figaschewsky ◽  
Peter Hönisch ◽  
Arnold Kühhorn ◽  
Sven Schrape
Keyword(s):  
Steady State ◽  
Numerical Analysis ◽  
Finite Volume ◽  
Rotor Blade ◽  
Compressible Flows ◽  
Rapid Change ◽  
Three Dimensional ◽  
Reversed Flow ◽  
Blade Vibration ◽  
One Dimensional

The following paper presents a numerical analysis of a deep surge cycle of a 4.5 stage research compressor. The resulting unsteady loads are used to determine the response of two particular rotor blade rows that are then compared to strain gauge data from measurements. Within a deep surge cycle the compressor experiences a rapid change of the flow field from forward to reversed flow. This rapid breakdown is linked to a new mean blade load. Hence, the rapid change in blade loads are able to excite fundamental blade modes similar to an impulse load. The resulting vibration magnitudes might reach critical levels. This paper demonstrates two different approaches to evaluate the unsteady flow during a surge cycle. The first uses a three dimensional, time accurate finite volume solver for viscid compressible flows to calculate the transient surge cycle of the compressor. The compressor itself is represented by a multi-blade-row sector model. The second approach makes use of the same solver and compressor domain to determine steady state characteristics of the HPC in forward, stalled and reversed flow. Based on these characteristics an one dimensional finite volume solver for inviscid compressible flows was developed to determine the transient compressor behavior. The one dimensional solver represents the compressor by source terms that are linked to the previously determined steady state characteristics.

The Abrasive Flow Machining Simulation of Common Rail Tube Holes Based on FLUENT

2014 ◽  
Vol 687-691 ◽  
pp. 4376-4381 ◽  
Author(s):  
Li Feng Zhu ◽  
Kai Wang ◽  
Huan Wu ◽  
Dong Xiu ◽  
Li Zhong Sun
Keyword(s):  
Numerical Analysis ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Dynamic Pressure ◽  
Three Dimensional ◽  
Common Rail ◽  
Machining Process ◽  
Two Phase ◽  
Abrasive Flow Machining ◽  
Solid Liquid

Based on the solid - liquid two-coupling theory, Use abrasive medium viscosity-temperature characteristics related to the mathematical model, using solid - liquid two-phase solution method Mixture models and standards, turbulence model combining with common rail pipe hole as the research object, choose different initial temperatures and processing procedures, numerical analysis was carried out on the flow channel wall temperature and turbulent kinetic energy. Using numerical analysis software FLUENT Abrasive Flow Machining rail tube orifice structure was three-dimensional numerical analysis; obtain a steady-state pressure, dynamic pressure, velocity, turbulent kinetic energy image, to study Abrasive Flow Machining process provides a theoretical basis and technical support.

Sign in / Sign up

Export Citation Format

Share Document