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Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine (2020)
Journal Article
Syawitri, T. P., Yao, Y., Yao, J., & Chandra, B. (in press). Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine. International Journal of Numerical Methods for Heat and Fluid Flow, https://doi.org/10.1108/hff-09-2019-0689

Abstract Purpose The aim of this paper is to assess the ability of a stress-blended eddy simulation (SBES) turbulence model to predict the performance of a three-straight-bladed vertical axis wind turbine (VAWT). The grid sensitivity study is condu... Read More about Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine.

Auxiliary variable-based identification algorithms for uncertain-input models (2019)
Journal Article
Chen, J., Zhu, Q., Chandra, B., & Pu, Y. (2020). Auxiliary variable-based identification algorithms for uncertain-input models. Circuits, Systems, and Signal Processing, 39, 3389-3404. https://doi.org/10.1007/s00034-019-01320-w

This study presents two auxiliary variable-based identification algorithms for uncertain-input models. The auxiliary variable-based least squares algorithm can obtain unbiased parameter estimates by introducing suitable auxiliary variable vectors. Fu... Read More about Auxiliary variable-based identification algorithms for uncertain-input models.

Flow characteristics in aeroengine bearing chambers with shallow sump (2019)
Conference Proceeding
Chandra, B., & Simmons, K. (2019). Flow characteristics in aeroengine bearing chambers with shallow sump. https://doi.org/10.1115/GT2019-90320

In an aeroengine oil is supplied to the bearings for lubrication and cooling. Subsequently, it creates a two phase flow environment in the bearing chamber that may contain droplets, mist, wall film, ligaments, froth or foam and liquid pools. After th... Read More about Flow characteristics in aeroengine bearing chambers with shallow sump.

Flow Characteristics in Aeroengine Bearing Chambers With Shallow Sump (2019)
Conference Proceeding
Chandra, B., & Simmons, K. (2019). Flow Characteristics in Aeroengine Bearing Chambers With Shallow Sump. https://doi.org/10.1115/gt2019-90320

In an aeroengine oil is supplied to the bearings for lubrication and cooling. Subsequently, it creates a two phase flow environment in the bearing chamber that may contain droplets, mist, wall film, ligaments, froth or foam and liquid pools. After th... Read More about Flow Characteristics in Aeroengine Bearing Chambers With Shallow Sump.

Assessment of stress-blended eddy simulation model for accurate prediction of three-straight-bladed vertical axis wind turbine performance (2019)
Presentation / Conference
Syawitri, T. P., Yao, Y., Yao, J., & Chandra, B. (2019, March). Assessment of stress-blended eddy simulation model for accurate prediction of three-straight-bladed vertical axis wind turbine performance. Paper presented at 54th 3AF International Conference on Applied Aerodynamics

The performance of a three-straight-bladed vertical axis wind turbine at low tip speed ratio has been evaluated by detached eddy simulation (DES) with stress-blended eddy simulation (SBES) turbulence model. Two grid topologies around the blades, i.e.... Read More about Assessment of stress-blended eddy simulation model for accurate prediction of three-straight-bladed vertical axis wind turbine performance.

Assessment of the oil scoop capture efficiency in high speed rotors (2018)
Journal Article
Paleo Cageao, P., Simmons, K., Prabhakar, A., & Chandra, B. (2019). Assessment of the oil scoop capture efficiency in high speed rotors. Journal of Engineering for Gas Turbines and Power, 141(1), 012401. https://doi.org/10.1115/1.4040812

© 2019 by ASME. Experimental research was conducted into a scooped rotor system that captures oil from a stationary jet and directs it through passages within the shaft to another axial location. Such a system has benefits for delivering oil via unde... Read More about Assessment of the oil scoop capture efficiency in high speed rotors.

A review of current technical development in vertical axis wind turbine technologies and their braking system for low speed, urban and offshore areas application (2018)
Presentation / Conference
Syawitri, T., Yao, Y., & Chandra, B. (2018, October). A review of current technical development in vertical axis wind turbine technologies and their braking system for low speed, urban and offshore areas application. Paper presented at International Conference of Global Warming and Climate Change 2018

Recently, there are growing interests of using Vertical Axis Wind Turbine (VAWT) to harvest wind energy from low wind speed in urban areas to relatively high wind speed in offshore wind farms. Horizontal Axis Wind Turbine (HAWT) has been known to hav... Read More about A review of current technical development in vertical axis wind turbine technologies and their braking system for low speed, urban and offshore areas application.

CFD simulation of three-straight-bladed vertical axis wind turbine at low tip speed ratios (2018)
Presentation / Conference
Syawitri, T., Yao, Y., Chandra, B., & Yao, J. (2018, October). CFD simulation of three-straight-bladed vertical axis wind turbine at low tip speed ratios. Paper presented at International Conference of Global Warming and Climate Change 2018

This paper presents computational fluid dynamics (CFD) simulations of a three-straight-bladed Vertical Axis Wind Turbine (VAWT) operating at a wind speed of 9 m/s and low Tip Speed Ratio (TSR) ranging from 1.44 to 3.3. The turbine blade has NACA 0021... Read More about CFD simulation of three-straight-bladed vertical axis wind turbine at low tip speed ratios.

Mechanisms for residence volume reduction in shallow sump (2018)
Journal Article
Chandra, B., Simmons, K., & Murphy, A. (2018). Mechanisms for residence volume reduction in shallow sump. Journal of Engineering for Gas Turbines and Power, 140(3), https://doi.org/10.1115/1.4037871

© 2018 by ASME. Gas turbine aero-engines employ fast rotating shafts that are supported by bearings at several axial locations along the engine. Due to extreme load and heat, oil is injected to the bearings to aid lubrication and cooling. The oil is... Read More about Mechanisms for residence volume reduction in shallow sump.

Experimental optimization of Rolls-Royce AE3007 sump design (2017)
Presentation / Conference
Chandra, B., Collicott, S., & Munson, J. (2017, June). Experimental optimization of Rolls-Royce AE3007 sump design. Paper presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition

The original sump design of Rolls-Royce AE3007 central sump is a tangential sump. An experimental program at Purdue University was conducted to investigate the characteristics of a tangential sump design. The research employed a bespoke experimental... Read More about Experimental optimization of Rolls-Royce AE3007 sump design.

Computational study of a customised shallow-sump aero-engine bearing chamber with inserts to improve oil residence volume (2017)
Presentation / Conference
Adeniyi, A., Chandra, B., & Simmons, K. (2017, June). Computational study of a customised shallow-sump aero-engine bearing chamber with inserts to improve oil residence volume. Paper presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition

An aero-engine bearing chamber is a structure that is used to contain and collect oil used in lubricating and cooling the bearings supporting the high-speed engine shafts. There are various bearings in an aero-engine. Within the bearing chambers, the... Read More about Computational study of a customised shallow-sump aero-engine bearing chamber with inserts to improve oil residence volume.

Innovative shallow sump customizations for aero-engine bearing chambers (2016)
Presentation / Conference
Chandra, B., & Simmons, K. (2016, June). Innovative shallow sump customizations for aero-engine bearing chambers. Paper presented at ASME Turbo Expo 2016

Aero-engines incorporate various bearing chambers and these typically contain bearings, seals, rotating shafts, stationary walls and struts, and sometimes gears. Oil is supplied for lubrication and cooling and is removed (scavenged) from the sump reg... Read More about Innovative shallow sump customizations for aero-engine bearing chambers.

Experimental investigation into the performance of shallow aeroengine off-takes (2014)
Conference Proceeding
Simmons, K., & Chandra, B. (2014). Experimental investigation into the performance of shallow aeroengine off-takes. In Volume 5C: Heat Transfer, (V05CT16A022). https://doi.org/10.1115/GT2014-26132

Copyright © 2014 by Rolls-Royce plc. Oil removal (scavenge) from aeroengine bearing chambers is an ongoing challenge for aeroengine designers. Effective scavenging of oil is necessary to avoid excessive heat generation, degradation of oil properties... Read More about Experimental investigation into the performance of shallow aeroengine off-takes.

Transient two-phase effects in an Aeroengine bearing chamber scavenge test rig (2014)
Conference Proceeding
Chandra, B., & Simmons, K. (2014). Transient two-phase effects in an Aeroengine bearing chamber scavenge test rig. In ASME 2014 International Mechanical Engineering Congress and Exposition - Volume 1: Advances in Aerospace Technology, (V001T01A046). https://doi.org/10.1115/IMECE2014-37554

Copyright © 2014 by ASME. Aeroengine bearing chambers typically contain bearings, seals, shafts and static parts. Oil is introduced for lubrication and cooling and this creates a two phase flow environment that may contain droplets, mist, film, ligam... Read More about Transient two-phase effects in an Aeroengine bearing chamber scavenge test rig.

Scavenge flow in a bearing chamber with tangential sump off-take (2013)
Journal Article
Munson, J. H., Collicott, S. H., Chandra, B., Collicott, S., & Munson, J. (2013). Scavenge flow in a bearing chamber with tangential sump off-take. Journal of Engineering for Gas Turbines and Power, 135(3), https://doi.org/10.1115/1.4007869

A tangential sump design is employed in several aero-engines mainly due to its simplicity and compactness. However various problems have prompted investigations of the sump design. An experimental program at Purdue University (Chandra, 2006, "Flows i... Read More about Scavenge flow in a bearing chamber with tangential sump off-take.

Study of gas/liquid behavior within an aeroengine bearing chamber (2013)
Journal Article
Wiedemann, N., Collicott, S. H., Chandra, B., Simmons, K., Pickering, S., Collicott, S., & Wiedemann, N. (2013). Study of gas/liquid behavior within an aeroengine bearing chamber. Journal of Engineering for Gas Turbines and Power, 135(5), https://doi.org/10.1115/1.4007753

Aeroengine bearing chambers typically contain bearings, seals, shafts and static parts. Oil is introduced for lubrication and cooling and this creates a two phase flow environment that may contain droplets, mist, film, ligaments, froth or foam and li... Read More about Study of gas/liquid behavior within an aeroengine bearing chamber.

Performance comparison for aeroengine-type sump geometries (2013)
Conference Proceeding
Keeler, B., Chandra, B., Simmons, K., & Keeler, B. (2013). Performance comparison for aeroengine-type sump geometries. In Volume 1: Advances in Aerodynamicshttps://doi.org/10.1115/IMECE2013-62836

Oil removal from aeroengine bearing chambers presents a challenge for aeroengine designers. Effective scavenging of oil is necessary to avoid excessive heat in the bearing chamber as this may lead to degradation of oil properties and deterioration in... Read More about Performance comparison for aeroengine-type sump geometries.

Liquid and gas flow behaviour in highly rotating environment (2011)
Conference Proceeding
Chandra, B., Simmons, K., Pickering, S., & Tittel, M. (2011). Liquid and gas flow behaviour in highly rotating environment. In Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Wind Turbine Technology, (337-345). https://doi.org/10.1115/GT2011-46430

In a typical aero engine bearing chamber, oil is introduced to lubricate and cool the bearings as well as the bearing chamber wall. The flow of the oil in the bearing chamber is very complex due to the presence of various forces: gravity, windage, ca... Read More about Liquid and gas flow behaviour in highly rotating environment.

Development of non-destructive heat resistance evaluation system for TBC on gas turbine blade (2010)
Conference Proceeding
Fujioka, T., Sakai, E., Takahashi, T., Fujii, T., Chandra, B., Simmons, K., …Tittel, M. (2010). Development of non-destructive heat resistance evaluation system for TBC on gas turbine blade. In Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials and Metallurgy, (125-131). https://doi.org/10.1115/GT2010-22631

The use of thermal barrier coatings (TBCs) is the key technique for realizing high-efficiency gas turbine combined cycles. Hence, TBCs are applied to various hot gas path components such as combustors, blades, and vanes. The application of a TBC caus... Read More about Development of non-destructive heat resistance evaluation system for TBC on gas turbine blade.

Windage power losses from spiral bevel gears with varying oil flows and shroud configurations (2009)
Journal Article
Johnson, G., Chandra, B., Foord, C., & Simmons, K. (2009). Windage power losses from spiral bevel gears with varying oil flows and shroud configurations. Journal of Turbomachinery, 131(4), 1-7. https://doi.org/10.1115/1.3072519

In many aero-engines, the power to drive accessories is transmitted through high speed bevel gears in a chamber in the center of the engine. The windage power loss (WPL) associated with these gears makes a significant contribution to the overall heat... Read More about Windage power losses from spiral bevel gears with varying oil flows and shroud configurations.


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