Thennavarajan S

@nal.res.in

PhD Scholar IITM-Aerospace Engineering and Senior Officer-2(GrIII5), Propulsion, CSIR-NAL
Thennavarajan s

Thennavarajan S


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https://researchid.co/thennavarajan
Design and Development of Aero Engine Components
Design and Development of High Speed Rotor System
Design and Development of Elastic Ring Squeeze Film Damper for High Speed Aero Engines
Design and Development of Air Bearings for High Speed Small Gas Turbine Engines
Aero Engine Health Monitoring and its Pressure and Temperature Sensor Development
Design and Development of superconductor current leads

EDUCATION

Doctoral Studies (PhD), Thesis progress
Indian Institute of Technology Madras

M.Tech.
National Institute of Technology Karnataka (NITK), Surathkal

AMIE/B.TECH
The Institution of Engineers (India) was established in 1920 in Kolkata, Department of Science & Technology, Government of India

RESEARCH, TEACHING, or OTHER INTERESTS

Aerospace Engineering, Mechanical Engineering, Multidisciplinary, Industrial and Manufacturing Engineering
4

Scopus Publications

52

Scholar Citations

4

Scholar h-index

3

Scholar i10-index

Scopus Publications

  • Machine Vision Based On-Board Diagnostics Model to Characterize Surface Degradation of Turbomachinery Components
    Thennavarajan S, Dilipkumar Bhanudasji Alone, AbdulGafoor C. P., N. R. Vadlamani, Arunachalam N.
    Journal of Nondestructive Evaluation Diagnostics and Prognostics of Engineering Systems, 2026
    This article proposes a novel machine vision (MV)-based technique to assess surface roughness (Ra) as an online diagnostic and monitoring system tool. Such a tool helps reduce operational downtime and minimize human intervention. The proposed method involves image acquisition in a controlled environment, detection of surface features through a parameter called “edge frequency” using the edge detection algorithms (EDAs), and developing a correlation between the estimated edge frequency and the experimentally measured Ra. Several well-known EDAs are evaluated on different samples, including emery papers with various grit values and turbomachinery blades. The superiority of Laplacian of Gaussian (LoG)-based EDA in terms of its resilience to noise and computational benefit is demonstrated. The edge frequency–Ra correlation is subsequently used to predict the Ra value of different sets to demonstrate prediction accuracy. Compared to contact-based measurements, the predictions on the emery samples are within 4.8%, while those on the blade samples are within 5.9%. Finally, the established correlation is used for the online diagnosis of a legacy axial compressor under cleaned and fouled conditions. The predicted Ra values for the samples and the trends agree with the historical data reported by the original equipment manufacturers (OEMs), demonstrating its ability as an on-board diagnostic (OBD) tool.
  • Experimental evaluation of elastic ring squeeze film dampers for small gas turbine engine
    S. Thennavarajan, Sadanand Kulkarni, L. P. Manikandan, Soumendu Jana, Ajit Kumar, Iqbal Momin
    Lecture Notes in Mechanical Engineering, 2021
  • Multi-auto associative neural network based sensor validation and estimation for aero-engine
    Brijeshkumar Shah, M Sarvajith, Balaji Sankar, S. Thennavarajan
    Autotestcon Proceedings, 2013
    Aircraft gas turbine engine, being a complex system, uses a wide sensor network to monitor its performance for control and Engine Health Management (EHM) purposes. Both applications necessitate accurate functioning of all sensors, however due to harsh operating conditions, life and accuracy of sensors is affected. Early detection of drift in measurement or fault in sensors is important as it can help in avoiding false alarms in the EHM system. It is equally important to predict the measurement, that the sensor failed to measure, till the time sensor is replaced. An Auto Associative Neural network (AANN) based sensor validation module is an analytically-redundant sensor network, which provides continuous sensor status information and estimates the measurement value in place of faulty measurements during both online and offline data validation. The number of sensors used to monitor engine are large and it is not viable to monitor all the sensors using a single AANN. Hence in this work a novel approach is adopted for sensor validation and Estimation (SVE) where sensors are grouped into smaller sets based on their location and physical relationships between them. By breaking network into smaller groups dual benefit is achieved; first it reduces complexity arising from higher dimensionality, secondly it ensures multiple-validation of each sensor through various networks. The network is trained using data generated from a validated twin spool turbojet engine simulation model. Presented approach is validated through a simplified experiment and results show prompt fault identification and prediction of sensor value with satisfactory accuracy.
  • Aero-thermodynamic modelling and gas path simulation for a twin spool turbo jet engine
    Balaji Sankar, Thennavarajan Subramanian, Brijeshkumar Shah, Vijayendranath Vanam, Soumendu Jana, Srinivisan Ramamurthy, Radhakant Satpathy, Benudhar Sahoo, Satish Yadav
    ASME 2013 Gas Turbine India Conference Gtindia 2013, 2013
    The user community of civil and military aircraft powered by gas turbine engines has a significant interest on simulation models for design, development and maintenance activities. These play a crucial role in understanding the aircraft mission performance. The simulation models can be used to understand the behavior of gas turbine engine running at various operating conditions, which are used for studying the aircraft performance and also vital for engine diagnostics. Other significant advantage of simulation model is that it can generate required data at intermediate stages in gas turbine engine, which sometimes cannot be obtained by measurement. Thus engine simulation model / virtual engine building is one of the important aspects towards development of Engine Health Management (EHM) system. This paper describes in detail the engine simulation model development for a typical twin spool turbo jet engine using commercially available Gas turbine Simulation Program (GSP). The engine simulation model has been used for typical aero-engine to get aero-thermodynamic gas path performance analysis related to engine run at Design point, Off Design points and the engine Acceleration-Deceleration Cycles (ADC). Simulations at different operating conditions have been carried out using scaled up characteristic maps of engine components. Design point data as well as engine gas path data obtained from test bed has been used to develop scaled up characteristic maps of the engine components. The simulation results have been compared with various test bed data sets for the purpose of validation. Predicted results of engine parameters like engine mass flow rate and thrust are in good agreement with the test bed data. This validated model can be used to simulate faulty engine components and to develop the fault identification modules and subsequently an EHM system.

RECENT SCHOLAR PUBLICATIONS

  • Machine Vision Based On-Board Diagnostics Model to Characterise Surface Degradation of Turbomachinery Components
    T Subramanian, DB Alone, AG Chakkunga Parambil, NR Vadlamani, ...
    Journal of Nondestructive Evaluation, Diagnostics and Prognostics of … , 2026
    2026
  • Experimental Study on Propane Gas Combustor Operated at High Combustion Intensity Operating Conditions
    UL Karthickraja Renganathan1, Abhishek Rishi2, Muthuselvan G3 *, Jeyaseelan ...
    Proceedings of the 12th Interantional and 52nd National Conference on Fluid … , 2025
    2025
  • Advance Non-Contact Online Diagnostic Model to Estimate Foul and Surface Degradation on Legacy Turboprop Engine Compressor Blades
    Thennavarajan Subramanian, Dilipkumar Bhanudasji Alone, Nagabhushana Rao ...
    32-NAPC 2022, IIT Bombay, https://sites.google.com/view/napc-2022/schedule … , 2022
    2022
  • Closure report: Development and supply of Active Magnetic Bearing scaled down model of sodium pump prototype
    SR Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2021
    2021
  • Preliminary design and simulation Model Development for Active Magnetic Bearing Equipped Full Scale Primary Sodium Pump shaft
    BKS Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2021
    2021
  • Simulation Model Development for Active Magnetic Bearing Equipped Scaled Primary Sodium Pump shaft
    BKS Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2021
    2021
  • Experimental Evaluation of Elastic Ring Squeeze Film Dampers for Small Gas Turbine Engine
    S Thennavarajan, S Kulkarni, LP Manikandan, S Jana, A Kumar, I Momin
    Proceedings of the National Aerospace Propulsion Conference, 507-526 , 2020
    2020
    Citations: 2
  • Detail Design Report of Test Setup for Active Magnetic Bearing Equipped Scaled Primary Sodium Pump Shaft
    PS Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2019
    2019
  • Engine Test-Bed Data Collection and Pre-processing for an Aero Engine Health Monitoring
    D Brijeshkumar J.Shah.Shri., Balaji Sankar,Shri., Thennavarajan S,Shri ...
    https://www.nal.res.in/ , 2019
    2019
  • Scaling and Conceptual Design of Test Setup for Active Magnetic Bearing Equipped Primary Sodium Pump Shaft
    PS Balaji Sankar,Shri., Sadanand S Kulkarni,Shri., Brijeshkumar J.Shah.Shri ...
    https://www.nal.res.in/ , 2018
    2018
  • Measurements in Propulsion System Test Facilities
    https://www.nal.res.in/ , 2018
    2018
  • Parameter Estimation, Sensitivity Studies and Simulation Model Development of a Twin Spool low Bypass Ratio Turbofan Engine
    https://www.nal.res.in/ , 2018
    2018
  • Detailed Report on " Design of Turbojet Engine for UCAV"
    https://www.nal.res.in/ , 2018
    2018
  • Design point parameter estimation of a legacy transport aircraft engine
    VKV Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2017
    2017
  • Development of Lubricant Free Hybrid Support System for High Speed Rotors
    RA Sadanand S Kulkarni,Shri., Brijeshkumar J.Shah.Shri., Balaji Sankar,Shri ...
    https://www.nal.res.in/ , 2017
    2017
  • Off design parameter estimation and simulation of a legacy transport aircraft engine
    VKV Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2017
    2017
  • Development of Rotor Bearing System for a Typical Small Gas Turbine Engine
    Sadanand Kulkarni, L P Manikandan, Thennavarajan S, S Jana
    ICOVP, 13th International Conference on Vibration Problems, 11 , 2017
    2017
  • Development of Rotor Bearing System for 100 kgf Thrust Small Gas Turbine Engine
    D Sadanand S Kulkarni,Shri., Manikandan LP,Shri., Thennavarajan S,Shri ...
    https://www.nal.res.in/ , 2017
    2017
  • Characterization of Squeeze Film Damper with Damper Ring for Small Gas Turbine Engine
    G Thennavarajan S,Shri., Manikandan LP,Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2017
    2017
  • Setting up of Bearing Test Rig and Testing with High Oxidative and Thermal Stability (HOTS) Oil and Reference Oil
    D Manikandan LP,Shri., Sadanand S Kulkarni,Shri., Thennavarajan S,Shri ...
    https://www.nal.res.in/ , 2017
    2017

MOST CITED SCHOLAR PUBLICATIONS

  • Aero-Thermodynamic Modelling and Gas Path Simulation for a Twin Spool Turbo Jet Engine
    SY Balaji Sankar, Thennavarajan Subramanian, Brijeshkumar Shah ...
    ASME 2013 Gas Turbine India Conference, V001T06A008-V001T06A008 , 2013
    2013
    Citations: 14
  • On Gas Turbine Simulation Model Development
    B Sankar, B Shah, S Thennavarajan, V Vanam
    National Conference on Condition Monitoring (NCCM), 1-17 , 2013
    2013
    Citations: 14
  • Multi-Auto Associative Neural Network based sensor validation and estimation for aero-engine
    TS Brijeshkumar Shah, M Sarvajith, Balaji Sankar
    AUTOTESTCON, 2013 IEEE, 1-7 , 2013
    2013
    Citations: 12
  • Object Follower and Barrier Escaping Robot Using Image Processing
    T Subramanian, R Madbhavi, S Potadar, SJ D’souza, KV Gangadharan
    International Journal of Innovative Research in Science,Engineering and … , 2015
    2015
    Citations: 5
  • Experimental Evaluation of Elastic Ring Squeeze Film Dampers for Small Gas Turbine Engine
    S Thennavarajan, S Kulkarni, LP Manikandan, S Jana, A Kumar, I Momin
    Proceedings of the National Aerospace Propulsion Conference, 507-526 , 2020
    2020
    Citations: 2
  • FSI and Modal Analysis of Elastic Ring Squeeze Film Damper for Small Gas Turbine Engines
    Thennavarajan S, Jeyaraj P, Manikandan L P, Kulkarni S S, S Jana
    COMSOL Multiphysics , 2016
    2016
    Citations: 2
  • Modal Analysis of Elastic Ring Squeeze Film Damper for Small Gas Turbine Engines
    S Thennavarajan, P Jeyaraj, LP Manikandan, SS Kulkarni, S Jana
    2016
    Citations: 2
  • Process for the continuous production of magnesium diboride based superconductors
    S Upendran, AKRNG Amma, VK Kutty, AR Padmavathy, SP Murikoli, ...
    US Patent 7,456,134 , 2008
    2008
    Citations: 1
  • Machine Vision Based On-Board Diagnostics Model to Characterise Surface Degradation of Turbomachinery Components
    T Subramanian, DB Alone, AG Chakkunga Parambil, NR Vadlamani, ...
    Journal of Nondestructive Evaluation, Diagnostics and Prognostics of … , 2026
    2026
  • Experimental Study on Propane Gas Combustor Operated at High Combustion Intensity Operating Conditions
    UL Karthickraja Renganathan1, Abhishek Rishi2, Muthuselvan G3 *, Jeyaseelan ...
    Proceedings of the 12th Interantional and 52nd National Conference on Fluid … , 2025
    2025
  • Advance Non-Contact Online Diagnostic Model to Estimate Foul and Surface Degradation on Legacy Turboprop Engine Compressor Blades
    Thennavarajan Subramanian, Dilipkumar Bhanudasji Alone, Nagabhushana Rao ...
    32-NAPC 2022, IIT Bombay, https://sites.google.com/view/napc-2022/schedule … , 2022
    2022
  • Closure report: Development and supply of Active Magnetic Bearing scaled down model of sodium pump prototype
    SR Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2021
    2021
  • Preliminary design and simulation Model Development for Active Magnetic Bearing Equipped Full Scale Primary Sodium Pump shaft
    BKS Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2021
    2021
  • Simulation Model Development for Active Magnetic Bearing Equipped Scaled Primary Sodium Pump shaft
    BKS Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2021
    2021
  • Detail Design Report of Test Setup for Active Magnetic Bearing Equipped Scaled Primary Sodium Pump Shaft
    PS Balaji Sankar,Shri., Brijeshkumar J.Shah.Shri., Sadanand S Kulkarni,Shri ...
    https://www.nal.res.in/ , 2019
    2019
  • Engine Test-Bed Data Collection and Pre-processing for an Aero Engine Health Monitoring
    D Brijeshkumar J.Shah.Shri., Balaji Sankar,Shri., Thennavarajan S,Shri ...
    https://www.nal.res.in/ , 2019
    2019
  • Scaling and Conceptual Design of Test Setup for Active Magnetic Bearing Equipped Primary Sodium Pump Shaft
    PS Balaji Sankar,Shri., Sadanand S Kulkarni,Shri., Brijeshkumar J.Shah.Shri ...
    https://www.nal.res.in/ , 2018
    2018
  • Measurements in Propulsion System Test Facilities
    https://www.nal.res.in/ , 2018
    2018
  • Parameter Estimation, Sensitivity Studies and Simulation Model Development of a Twin Spool low Bypass Ratio Turbofan Engine
    https://www.nal.res.in/ , 2018
    2018
  • Detailed Report on " Design of Turbojet Engine for UCAV"
    https://www.nal.res.in/ , 2018
    2018

RESEARCH OUTPUTS (PATENTS, SOFTWARE, PUBLICATIONS, PRODUCTS)

U. Syamaprasad, Abhilash Kumar, K. Vinod, R. P. Aloysius, Sarun. P. M, Thennavarajan. S, P. Guruswamy at NIIST, Thiruvananthapuram PCT/IN2005/000440 (2007) (WO/2007/060687) “A Process for Continuous Production of Magnesium Diboride Based Superconductors” Granted in following countries Granted in India, US, UK, Germany and Australia, Japan
U. Syamaprasad, Abhilash Kumar, K. Vinod, R. P. Aloysius, Sarun. P. M, Thennavarajan. S, P. Guruswamy
Thennavarajan. S/CSIR-NIIST
Patent No. PCT/IN2005/000440 (2007) Engineering and Technology Published
Filed 2005-06-02 Published 2007-06-02

Thennavarajan. S, R. P. Aloysius, P. Guruswamy, U. Syamaprasad at NIIST, Thiruvananthapuram 0003NF/2006 (2006) “Superconductive contacts in bulk oxide superconductors for high-current applications and method for forming the same (003NF/2006)” Filed in India.
Thennavarajan. S, R. P. Aloysius, P. Guruswamy, U. Syamaprasad
Thennavarajan. S/CSIR-NIIST
Patent No. 0003NF/2006 (2006) Filed
Filed 2006-03-01

INDUSTRY EXPERIENCE

From May 2002 to till date (21years and 6Months)