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Optimisation of straight plate upstream deflector for the performance enhancement of vertical axis wind turbine at low, medium and high regimes of tip speed ratios (2022)
Journal Article
Syawitri, T. P., Yao, Y., Yao, J., & Chandra, B. (2022). Optimisation of straight plate upstream deflector for the performance enhancement of vertical axis wind turbine at low, medium and high regimes of tip speed ratios. Wind Engineering, 46(5), 1487-1510. https://doi.org/10.1177/0309524x221084980

Location and geometry optimisations of Straight Plate Upstream Deflector (SPUD) for performance enhancement of a three-straightbladed Vertical Axis Wind Turbine (VAWT) are carried out at three regimes of tip speed ratios (TSRs). Results analysis reve... Read More about Optimisation of straight plate upstream deflector for the performance enhancement of vertical axis wind turbine at low, medium and high regimes of tip speed ratios.

A review on the use of passive flow control devices as performance enhancement of lift-type vertical axis wind turbines (2022)
Journal Article
Syawitri, T. P., Yao, Y., Yao, J., & Chandra, B. (2022). A review on the use of passive flow control devices as performance enhancement of lift-type vertical axis wind turbines. Wiley Interdisciplinary Reviews: Energy and Environment, 11(4), e435. https://doi.org/10.1002/wene.435

This article provides a comprehensive review about passive flow control devices (PFCDs) implemented in lift-type vertical axis wind turbine (LVAWT), focusing on the underlying flow physics mechanisms and to what extents they can improve the LVAWT per... Read More about A review on the use of passive flow control devices as performance enhancement of lift-type vertical axis wind turbines.

Revisiting voyager 2's trajectory (2022)
Journal Article
Chandra, B., & Arnott, K. (2022). Revisiting voyager 2's trajectory. Journal of the British Interplanetary Society, 75(2), 42-47

This paper presents reconstruction of Voyager 2 trajectory to examine how the mission was optimised for fuel and Time of Flight(TOF), as well as to find out if there is a more efficient trajectory for the full Earth-Jupiter-Saturn-Uranus-Neptune (EJS... Read More about Revisiting voyager 2's trajectory.

Geometry optimisation of vertical axis wind turbine with Gurney flap for performance enhancement at low, medium and high ranges of tip speed ratios (2021)
Journal Article
Syawitri, T. P., Yao, Y., Yao, J., & Chandra, B. (2022). Geometry optimisation of vertical axis wind turbine with Gurney flap for performance enhancement at low, medium and high ranges of tip speed ratios. Sustainable Energy Technologies and Assessments, 49, Article 101779. https://doi.org/10.1016/j.seta.2021.101779

Optimisation of Gurney flap (GF) geometries mounted on a three-straight-bladed vertical axis wind turbine (VAWT) is evaluated with computational fluid dynamics (CFD) solution and Taguchi method, considering the blade rotating effect at three tip spee... Read More about Geometry optimisation of vertical axis wind turbine with Gurney flap for performance enhancement at low, medium and high ranges of tip speed ratios.

Scavenge performance of an optimized shallow sump at various flow conditions (2021)
Journal Article
Chandra, B., & Johnson, K. (2021). Scavenge performance of an optimized shallow sump at various flow conditions. Journal of Engineering for Gas Turbines and Power, 143(2), Article 021014. https://doi.org/10.1115/1.4049405

Oil scavenge flow in aero-engine bearing chamber remains largely a challenging problem for many engine designers. Research campaign on scavenge flow has been conducted by G2TRC - Gas Turbine and Transmissions Research Centre (previously Rolls Royce U... Read More about Scavenge performance of an optimized shallow sump at various flow conditions.

Comparison study of URANS and hybrid RANS-LES models on predicting vertical axis wind turbine performance at low, medium and high tip speed ratio ranges (2020)
Journal Article
Syawitri, T. P., Yao, Y. F., Chandra, B., & Yao, J. (2021). Comparison study of URANS and hybrid RANS-LES models on predicting vertical axis wind turbine performance at low, medium and high tip speed ratio ranges. Renewable Energy, 168, 247-269. https://doi.org/10.1016/j.renene.2020.12.045

Comparison study of unsteady Reynolds-averaged Navier-Stokes (URANS) and hybrid RANS-LES models is carried out for predicting the performance of three-straight-bladed vertical axis wind turbine operating within tip speed ratios (TSRs) ranges of (1.44... Read More about Comparison study of URANS and hybrid RANS-LES models on predicting vertical axis wind turbine performance at low, medium and high tip speed ratio ranges.

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. (2021). 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, 31(2), 655-673. https://doi.org/10.1108/HFF-09-2019-0689

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 conducted to ev... Read More about Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine.

The effect of gurney flap on flow characteristics of vertical axis wind turbine (2020)
Journal Article
Syawitri, T. P., Yao, Y. F., Yao, J., & Chandra, B. (2020). The effect of gurney flap on flow characteristics of vertical axis wind turbine. International Journal of Modern Physics B, 34(14n16), Article 2040107. https://doi.org/10.1142/S0217979220401074

Recently, the Gurney Flap (GF) has been used to improve the performance of Horizontal Axis Wind Turbine (HAWT) by enhancing its lift coefficient. Compared to HAWT, research on GF application for Vertical Axis Wind Turbine (VAWT) is very limited. More... Read More about The effect of gurney flap on flow characteristics 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.

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.

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.

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.

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.