CFD simulation for the design of combustor in turbocharger test rig

2019 ◽  
Author(s):  
M. Nalla Mohamed ◽  
R. Sivaprasad
Keyword(s):  
Cfd Simulation ◽  
Test Rig

Influence of Gas Feeding Position on the Performance of Radial-Inflow Hydrostatic Gas Ultra-Short Journal Bearings

2016 ◽  
Author(s):  
Chao Nie ◽  
Xiaojun Yan ◽  
Xia Chen
Keyword(s):  
Rotational Speed ◽  
Cfd Simulation ◽  
Journal Bearing ◽  
Maximum Speed ◽  
Test Rig ◽  
Thrust Bearings ◽  
Axial Stability ◽  
Speed Measurement ◽  
Gas Leaks ◽  
Better Than

To investigate the influence of gas feeding position on the performance of radial-inflow hydrostatic gas ultra-short (with a L/D value as 0.1) journal bearing two rotor-bearing system test rigs with two different feeding positions (central feeding and bottom feeding) for the journal bearing were designed. A rotor measurement system with an original rotational speed measurement program is built. Rotation experiments to measure the maximum rotational speed of rotors under different inlet pressure of journal bearing were conducted. It was found that, the rotor supported by the central feeding journal bearing worked better, and achieved a maximum rotational speed of 40000 rpm, (83.74m/s for the tip speed). While the test rig with bottom feeding journal bearing could not function well. To verify the reasons behind the failure mentioned above, the flow condition in the journal clearance and the rotor bottom clearance was analyzed by the CFD simulation. It shows that most of the journal bearing gas “leaks” into the rotor bottom clearance in the bottom feeding bearing test rig, disarranging the axial stability of the rotor and the normal functioning of the thrust bearings. In conclusion, the central feeding radial-inflow journal bearing is better than the bottom feeding one, for the better operability and higher maximum speed. And an ideal feeding position is supposed to make the journal bearing does not influence the axial stability of the rotor and the functioning of the thrust bearings.

A Comprehensive Investigation of Preswirled Flow Through Rotating Radial Holes

2014 ◽  
Vol 137 (3) ◽  
Author(s):  
Daniel Riedmüller ◽  
Jan Sousek ◽  
Michael Pfitzner
Keyword(s):  
Experimental Data ◽  
Gas Turbines ◽  
Discharge Coefficient ◽  
Cfd Simulation ◽  
Test Rig ◽  
Outer Annulus ◽  
Flow Phenomena ◽  
Flow Through ◽  
Flow Directions ◽  
Experimental Findings

This paper reports on the flow (centrifugal = radially outward, centripetal = radially inward) through rotating radial orifices with and without preswirl in the flow approaching the orifice in the outer annulus. The aerodynamical behavior of flow through radial rotating holes is different from the one through axial and stationary holes due to the presence of centrifugal and Coriolis forces. To investigate the flow phenomena and the discharge coefficient of these orifices in detail, an existing test rig containing two independently rotating shafts (corotating and counter rotating) was used. To simulate conditions of real gas turbines, where the flow is often influenced by upstream components, various preswirl angles were used in the test rig. Measurements of the flow discharge coefficient in both flow directions through the orifices (centripetal and centrifugal), with and without preswirl generation in the outer annulus, are presented at various flow conditions (pressure ratios across orifices, Mach numbers of approaching flow) and for different geometric parameters (length to diameter ratios, sharp/rounded inlet edges). Flow effects that occur with preswirled flow are clarified. A comparison of the experimental data, for both flow directions, shows a similar behavior of the discharge coefficients with increasing shaft speeds. To supplement the experimental data and to better understand the experimental findings, numerical simulations were performed, which show a good agreement with the experimental results. Furthermore, an optimization model with complete automatic grid generation, computational fluid dynamics (CFD) simulation, and postprocessing, was built to enable large parametric studies, e.g., grid independence of the solutions.

Design of a High Speed Internal Gear Pump to Increase the Power Density of Electro Hydraulic Actuators (EHA) in Mobile Applications

2019 ◽  
Author(s):  
Tobias Pietrzyk ◽  
David Roth ◽  
Georg Jacobs ◽  
Schmitz Katharina
Keyword(s):  
High Speed ◽  
Cfd Simulation ◽  
Mechanical Efficiency ◽  
Gear Pump ◽  
Suction Pressure ◽  
Shaft Seal ◽  
Test Rig ◽  
Cfd Simulations ◽  
Internal Gear ◽  
High Suction

Abstract Increasing the rotational speed of the internal gear pump entails addressing topics such as cavitation, overheating and filling problems of the tooth spaces. Besides the development of a tooth geometry and flow optimization, using CFD simulation is necessary. This paper discusses the design of the newly developed high speed internal gear pump. This includes a detailed description of the different parts as well as the dimensioning of the pump by using CFD simulations. The geometry of the pressure build-up groove has a significant effect of pressure build up inside the pump. Therefore, three different geometries are investigated. The calculation of the journal bearings for the internal gear as well as for the driving shaft is shown. To avoid cavitation problems, the suction pressure of the pump will be increased up to 25 bar. This paper will show the technical arrangements to reach this high suction pressure level whilst still using a radial shaft seal ring. In order to determine the efficiency of the newly developed high speed pump, a test rig was built up. The test rig allows the measurement of the volumetric efficiency as well as the hydraulic-mechanical efficiency at different operation points up to 10 000 rpm and 250 bar.

scholarly journals An unsteady, moving mesh CFD simulation for Harrier hot-gas ingestion control analysis

2007 ◽  
Vol 111 (1117) ◽  
pp. 133-144 ◽  
Author(s):  
G. A. Richardson ◽  
W. N. Dawes ◽  
A. M. Savill
Keyword(s):  
Model Calculation ◽  
Turbulence Model ◽  
Cfd Simulation ◽  
Impinging Jets ◽  
Moving Mesh ◽  
Scale Model ◽  
Control Analysis ◽  
Test Rig ◽  
Hot Gas ◽  
Flow Domain

Hot gas ingestion (HGI) can be a problematic feature of short take-off vertical landing (STOVL) aircraft during the descent phase of landing, or while on the ground. The hot exhaust gases from the downwards pointing nozzles can be re-ingested into the engine intakes, causing power degradation or reduced engine surge margin. The flow-fields that characterise this phenomenon are complex, with supersonic impinging jets and cross-flows creating large ground vortices and fountain up-wash flows. A flow solver has been developed to include a suitable linear mesh deformation technique for the descending aircraft configuration. The code has been applied to predict the occurrence of HGI, by simulating experimental results from a 1/15th scale model of a descending Harrier. This has enabled an understanding of the aerodynamic mechanisms that govern HGI, in terms of the near-field and far-field effects and their impact on the magnitude of temperatures at the engine intake. This paper presents three sets of CFD results. First a validation exercise shows predicted results from the twin-jet with intake in crossflow test-case. This is an unsteady Reynolds averaged Navier Stokes (URANS) solution for a static geometry (there is no moving mesh). This allows comparison with experiment. Secondly, a full descent phase URANS Spalart-Allmaras (SA) turbulence model calculation is done on an 8·5m cell mesh for half the flow domain of the Harrier model and test-rig without dams/strakes. This shows how the HGI flow mechanisms affect the engine intake temperature profiles, for the case where there are no flow control methods on the underside of the aircraft. Thirdly, the full descent phase URANS SA turbulence model calculation is done on a 22·4m cell mesh for the full flow domain of the Harrier model and test-rig, with the dam/strake geometry included in the structured mesh region.

scholarly journals COMPARISON OF AXIAL FAN ROTOR EXPERIMENTAL DATA WITH CFD SIMULATION

2016 ◽  
Vol 56 (1) ◽  
pp. 62 ◽  
Author(s):  
Aleš Prachař
Keyword(s):  
Experimental Data ◽  
Boundary Conditions ◽  
Cfd Simulation ◽  
Free Stream ◽  
Calculated Data ◽  
Experimental Simulation ◽  
Test Rig ◽  
Axial Fan ◽  
Axial Fans ◽  
Adequate Agreement

Data obtained from an experimental simulation on a new test rig for axial fans are compared to a CFD simulation. The Edge solver is used and the development needed for the simulation (boundary conditions, free stream consistency) is described. Adequate agreement between the measured and calculated data is observed.

Efficient CFD Simulation Method for Calculation of Drag Torque in Wet Multi-plate Clutches in Comparison to Test Rig Results

2021 ◽  
pp. 164-176
Author(s):  
Daniel Groetsch ◽  
Rudi Niedenthal ◽  
Katharina Voelkel ◽  
Hermann Pflaum ◽  
Karsten Stahl
Keyword(s):  
Cfd Simulation ◽  
Simulation Method ◽  
Drag Torque ◽  
Test Rig

scholarly journals Comparison of velocity measurements by high temperature anemometer and laser-doppler anemometer with results of CFD-simulation

2002 ◽  
Vol 6 (1) ◽  
pp. 3-13 ◽  
Author(s):  
M. Zimmel ◽  
J. Rath ◽  
G. Staudinger ◽  
B. Simpson ◽  
M. Brown ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
Low Cost ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Gas Velocity ◽  
Velocity Measurements ◽  
Test Rig ◽  
Blended Coal ◽  
Measurement Results ◽  
Lda Measurement

In the present work, results of gas velocity measurements with a newly developed vane anemometer (HTA - High Tem per a ture Anemometer) are compared with re sults of measurements obtained from Laser-Doppler Anemometer (LDA). The measurements were carried out at the combustion test rig of ALSTOM Combustion Services Ltd. in Derby/UK, and demonstrate the usability and accuracy of the HTA under severe conditions. The test rig was provided with a triple register low NOx coal burner firing pulverised Colombian blended coal at a constant thermal load of 30 MW. Although the environment was both very hot (up to 1350 ?C) and dust laden, the vane anemometer worked with an accuracy comparable to the reference LDA measurement. Since the anemometer represents a relatively simple to use and low cost option compared with LDA, it is seen as aviable alternative for gas velocity measurements in difficult environments. The measurement results are also demonstrated to compare favourably with the results from CFD calculations of the flow in the combustion chamber of the test rig.

A Comprehensive Investigation of Pre-Swirled Flow Through Rotating Radial Holes

2014 ◽  
Author(s):  
Daniel Riedmüller ◽  
Jan Sousek ◽  
Michael Pfitzner
Keyword(s):  
Experimental Data ◽  
Gas Turbines ◽  
Discharge Coefficient ◽  
Cfd Simulation ◽  
Test Rig ◽  
Outer Annulus ◽  
Flow Through ◽  
Flow Directions ◽  
Experimental Findings ◽  
Swirled Flow

This paper reports on the flow (centrifugal = radially outwards, centripetal = radially inwards) through rotating radial orifices with and without pre-swirl in the flow approaching the orifice in the outer annulus. The aerodynamical behavior of flow through radial rotating holes is different from the one through axial and stationary holes due to the presence of centrifugal and Coriolis forces. To investigate the flow phenomena and the discharge coefficient of these orifices in detail, an existing test rig containing two independently rotating shafts (co- and counter rotating) was used. To simulate conditions of real gas turbines, where the flow is often influenced by upstream components, various pre-swirl angles were used in the test rig. Measurements of the flow discharge coefficient in both flow directions through the orifices (centripetal and centrifugal), with and without pre-swirl generation in the outer annulus, are presented at various flow conditions (pressure ratios across orifices, Mach numbers of approaching flow) and for different geometric parameters (length to diameter ratios, sharp/rounded inlet edges). Flow effects, that occur with pre-swirled flow are clarified. A comparison of the experimental data, for both flow directions, shows a similar behavior of the discharge coefficients with increasing shaft speeds. To supplement the experimental data and to better understand the experimental findings, numerical simulations were performed, which show a good agreement with the experimental results. Furthermore, an optimization model with complete automatic grid generation, CFD simulation and post-processing, was built to enable large parametric studies e.g. grid independence of the solutions.

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