A few papers & tech presentations (6/23/25)

2025

2025 Turbomachinery & Pump Symposia– September 16-18, Houston, TX

 

 

San Andrés, L., 2025, Tutorial, “SEALED ENDS SQUEEZE FILM DAMPERS AND INTEGRAL SQUEEZE FILM DAMPERS: Engineering Models and Experimental Verification.” Coming soon!

2024

2024 Turbomachinery & Pump Symposia– August 20-22, Houston, TX

 

 

San Andrés, L., Lu, X., and Wu, Tingcheng, “Wet (Bubbly Liquid) Seals for Multiphase Pumps: Leakage and Dynamic Force Coefficients of Two seals and a Simple Way to Control Seal Stiffness in Vertical Pump Configurations,” https://hdl.handle.net/1969.1/1582500

 

San Andrés, L., and Kawashita, R., “Measurement and Prediction of Leakage and Cavity pressures in an Interlocking Labyrinth Seals Configured with Three Swirl Brake Designs,” https://hdl.handle.net/1969.1/15822468

 

2023  A Review of Turbine and Compressor Aerodynamic Forces in Turbomachinery, Lubricants 2023, 11(1), 26; (https://doi.org/10.3390/lubricants11010026  ) Luis San Andres

2022

2022 Chinese International Turbomachinery Conference, Invited Lecture October 22, 2022 Kun Ming, China  (http://conference.cftn.cn/en/home/)

On Multiphase Pump Seals: Leakage and Gas Injection to Control Seal Centering Stiffness

Luis San Andres, Mast-Childs Chair Professor Xueliang Lu, Hunan Sund Industrial and Technological Co.,LTD

The presentation shows measurements of leakage and dynamic force coefficients for four annular pressure seals supplied with an air in oil mixture, from pure liquid to just air. The experimental results demonstrate a decrease in damping and a rise in centering stiffness as the gas content increases. Next, single point gas injection serves to change the seal dynamic stiffness (K>0), produce stiffness asymmetry and promote system static stability, most desirable for the operation of vertical hydraulic turbines and submersible pumps.

 

21st Pprime Workshop: Sealing Challenges in High Speed Applications, Keynote Invited. Angouleme, France, October 6, 2022

Annular gas seals in the 21st century: Leakage, force coefficients and rotor dynamic stability.

Luis San Andres, Mast-Childs Chair Professor

 

51th Turbomachinery & Pump Symposium Sept 13-15, 2022 Houston (https://tps.tamu.edu)

ANNULAR CLEARANCE GAS SEALS IN THE 21ST CENTURY (ßtutorial https://hdl.handle.net/1969.1/197707
and presentationà) A REVIEW OF THE EXPERIMENTAL RECORD ON LEAKAGE AND DYNAMIC FORCE COEFFICIENTS, INCLUDING COMPARISONS OF MODEL PREDICTIONS TO TEST DATA  

L. San Andrés and A. Delgado,

World Tribology Congress – July 11-15 2022 Lyon, France – Keynote Lecture

On Pump Seals Operating with Multiple Phase Conditions: Measurements and Gas Injection to Increase Seal Centering Stiffness

 

ASME Turbo Expo 22 – June 14 (Rotterdam, The Netherlands)
AETA Award For Outstanding Contributions to Air  Breathing Propulsion Through Inspiring Leadership, Education, and Research Having Major Impacts on Aircraft Engine Operational Capability, Performance, and Design

Special Lecture Measurements and Models of Squeeze Film Dampers’ Forced Response and a Bird’s View to Air Ingestion and Entrapment

 

Asia Turbomachinery & Pump Symposium – May 24-26, 2022, Kuala Lumpur, Malaysia https://atps.tamu.edu
Lu, X., San Andrés, L., and Koo, B., 2022, “On the Influence of Lubricant Feedhole Size and End Plate Seals’ Clearance on the Dynamic Performance of Integral Squeeze Film Dampers,” (Lecture) (https://hdl.handle.net/1969.1/197044)

San Andrés, L., and Delgado. A., 2022, “Annular Clearance Seals: Models and Measurements for Leakage, Force Coefficients and their Effect on Rotor Stability,” (Tutorial). (https://hdl.handle.net/1969.1/197061)

Torres, J., San Andrés, L., and Yang, J., 2022, “Leakage and Dynamic Force coefficients for a Stepped Shaft Labyrinth Seal and a Stepped Pocket Damper Seal,” (Lecture) (https://hdl.handle.net/1969.1/197041 )

 

2021

50th Turbomachinery & Pump Symposia – Dec 14-16, Houston https://tps.tamu.edu

San Andrés, L., and Alcantar, A., 2021, “Effect of Reduced Oil Flow Rate on the Static and Dynamic Performance of a Tilting Pad Journal Bearing Running in both the Flooded and Evacuated Conditions,” (https://hdl.handle.net/1969.1/196726)

 

Asia Turbomachinery & Pump Symposium – Virtual Event (February 23-25) https://atps.tamu.edu

San Andrés, L., Wilkinson, S., and Yang, J., 2021, “On the Experimental Static and Dynamic Load Performance of a Water Lubricated Hybrid Thrust Bearing,” (https://hdl.handle.net/1969.1/197484)

San Andrés, L., Hardik, J., Kaizar, H., and Thorat, M., 2021, “Effect of Flow Rate on the Performance of a Flooded-Ends Tilting Pad Journal Bearing – Experiments and Predictions,” (https://hdl.handle.net/1969.1/197464)

Childs, D., Yang, J., Moreland, J.A., Torres, J. M., and San Andrés, L., 2021, “Measured Leakage and Rotordynamic Coefficients for the Following Liquid Annular Seals: (a) Smooth rotor/Grooved Stator, and (b) Grooved Rotor/Smooth-Stator,” (https://hdl.handle.net/1969.1/197457) 

 

2020 à COVID19 World Pandemic
         Turbomachinery and Pump Symposium Virtual Event (December 8-10)

San Andrés, L., Hardik, J.  (*), Kaizar, H. (*), and Thorat, M., 2020, “Effect of Flow Rate on the Performance of a Flooded-Ends Tilting Pad Journal Bearing – Experiments and Predictions,” (https://hdl.handle.net/1969.1/196801)

 

Delgado. A., San Andrés, L., Thiele, J. (*), Yang, J., and Cangioli, F., 2020, “Rotordynamic Performance of a Fully-Partitioned Damper Seal: Experimental and Numerical Results,” (https://hdl.handle.net/1969.1/196836)

 

2019 San Andrés, L., and Rohmer. M., 2019, “Failure of a Test Rig Operating with Pressurized Gas Bearings: a Lesson on Humility,” Case Study, Asia Turbomachinery & Pump Industry Summit, Kuala Lumpur, Malaysia, July 9-11.

            Koosha, R., and San Andrés, L., 2019, “On the Static Load Performance of a Large Size, Heavily Loaded Spring Supported Thrust Bearing,” 2019 STLE Annual Meeting & Exhibition, May 19-23, Nashville, TN.

2018

San Andrés, L., and Yang, J., 2018, “The Influence of Corner Shape on the Static and Dynamic Performance on an Annular Pressure Seal,” Proc. Global Power and Propulsion Society Forum 18, Zurich, Switzerland, 10-12 January 2018, Paper GPPS-2018-55 (www.gpps.global)

 

San Andrés, L, and Abdollahi, B., 2018, “Advanced Model Predictions vs. Test Data in Tilting Pad Bearings for Compressors,” Proc. of Third Chinese International Turbomachinery Conference, CTC, April 12-15, 2018, Chong Qing, China, Paper CITC 2018

 

II Asia Turbomachinery and Pump Symposium, The Turbomachinery Laboratory, Texas A&M University, Mar. 13–15, Singapore
San Andrés, L., and Abdollahi, B., 2018, “On the Performance of Tilting Pad Bearings: A Novel Model for Lubricant Mixing at Oil Feed Ports With Improved Estimation of Pads’ Inlet Temperature and Its Validation against Experimental Data, (https://oaktrust.library.tamu.edu/handle/1969.1/172520 )

San Andrés, L, and Lu, L., 2018, “On the Leakage and Rotordynamic Force Coefficients of Pump Annular Seals Operating with Air/Oil Mixtures: Measurements and Predictions,” ( http://hdl.handle.net/1969.1/172516 )

 

2016

San Andrés, L., Jeung, S.-H, Den, S., and Savela, G., 2016 ‘‘Squeeze Film Dampers: A Further Experimental Appraisal of their Dynamic Performance,’’ Proc. 45th Turbomachinery Symposium, The Turbomachinery Laboratory, Texas A&M University, Sept 12-15, Houston, TX, https://doi.org/10.21423/R1BC7T

San Andrés, L., Jeung, S.-H, Den, S., and Savela, G., 2016 ‘‘Squeeze Film Dampers: An Experimental Appraisal of their Dynamic Performance,’’ I Asia Turbomachinery and Pump Symposium, The Turbomachinery Laboratory, Texas A&M University, Feb 22-25, Singapore, https://doi.org/10.21423/R12Q4N 

2015  Jeung, S.-H, M. Rohmer, L. San Andrés, and A. Devitt, 2015, “Experimental Assessment of Drag and Rotordynamic Response for a Porous Type Gas Bearing,” STLE Annual Meeting & Exhibition, May 17-21, Dallas, TX

 

2014  San Andrés, L., Norsworthy, J., 2014, “Measurement of Drag Torque, Lift Off Speed and Rotordynamic Force Coefficients in a Shimmed BFB,” 9TH IFToMM INTERNATIONAL CONFERENCE ON ROTOR DYNAMICS, Sept 22-25, 2014, Milano, Italy

 

2013  San Andrés, L., and Anderson, L., 2013, “Leakage for an All-Metal Compliant Gas Seal Operating at High Temperature,” 2013 STLE Annual Meeting & Exhibition, May 5-9, 2013, Detroit, Michigan, USA

 

2011  Research Progress Overview on Turbocharger NL Bearings and Rotordynamics 

 

2010
San Andrés, L., and Vistamehr, A., 2010, “Nonlinear Rotordynamics of Vehicle Turbochargers: Parameters Affecting Sub Harmonic Whirl frequencies and    Their Jump,” Proc. of the 8th IFToMM International Conference on Rotordynamics, September,  Seoul, Korea, Paper P-1115

         San Andrés, L., Camero, J., Muller, S., Chirathadam, T., and Ryu, K., 2010, “Measurements of  Drag Torque, Lift Off Speed, and Structural Parameters in a 1st Generation Floating Gas Foil Bearing”, Proc. of the 8th IFToMM International Conference on Rotordynamics, September 2010, Seoul, Korea, Paper P-1113

NASA report Howard, S., and San Andrés, L., 2010, “A New Analysis Tool Assessment for Rotordynamic Modeling of Gas Foil Bearings,” NASA/TM-2010-216354

Work on Gas Foil bearings until Dec 2010 Slide show (40 MB), Pdf file, Movie: test rig operation (8.8 MB)

2009 Metal mesh foil bearings Invited Lecture EPN (July 2009) Quito-Ecuador

 

Kim, T.H., L. San Andrés , J. Nourse, J.L. Wade, and D. Lubell, 2009, “Modeling of a Gas Foil Bearing for Microturbine Applications: Predictions versus Experimental Stiffness and Damping Force Coefficients,” World Tribology Congress 20009, Kyoto, Japan, September 6-11, 2009.

 

NASA report San Andrés, L., Kim, T.H., and Ryu, 2009, “Thermohydrodynamic Analysis of Bump Type gas Foil Bearings: A Model Anchored to Test Data,” Final project Report to NASA Research NNH06ZEA001N-SSRW2

 

 2008 ISCORMA -2008 Plenary Lecture on Gas Bearings, Hawaii (L. San Andrés)

  San Andrés, L., Baker, J., and Delgado, A., 2008, “Measurement of Leakage and Identification of Structural Force Coefficients in a Hybrid Brush Seal,” STLE Annual Meeting. Cleveland, OH, Extended Abstract, May.

2007
De Santiago, O., and L., San Andrés, 2007, “Experimental Identification of Bearing Dynamic Force Coefficients in a Flexible Rotor – Further Developments,” Tribology & Lubrication Technology, June 2007, pp. 40-50.

            San Andrés, L., Baker, J., and Delgado, A., 2007, “Measurements of Leakage and Power Loss in a Hybrid Brush Seal,” Proceedings of 6th EDF/LMS Poitiers Workshop, Universite de Poitiers, France, September 27

 

2005

Kim, T.H., and L. San Andrés, 2005, “Analysis of Gas Foil Bearings with Piecewise Linear Elastic Supports,” Paper WTC 2005-63397, III World Tribology Conference, Washington D.C., September

Kim, T.H., and L. San Andrés, 2006, “Limits for High Speed Operation of Gas Foil Bearings,” Paper WTC 2005-63398, III World Tribology Conference, Washington D.C., September

Pan, C., and L. San Andrés, 2005, “The Narrow Groove Bearing Analysis Revisited,” Paper WTC 2005-63803, III World Tribology Conference, Washington D.C., September

San Andrés, L., A. Delgado, and J. Justak, 2005, “Measurements of leakage, structural stiffness and energy dissipation parameters in a shoed brush seal,” Sealing Technology, December, pp. 7-10. (Elsevier Pubs).

San Andrés, L., 2005, HYBRID GAS BEARINGS FOR OIL-FREE TURBOMACHINERY: Experiments and model validation, 1st International Conference on Experiments/Process/System Modeling/Simulation/Optimization, Athens, Greece, Paper 189, July 6-9.

 

2003

Rubio, D., and L., San Andrés, 2003, “Identification of Structural Stiffness in Bump-Type Foil Bearings”, Proc. VIII Congreso y Exposición Latinoamericana de Turbomaquinaria, Veracruz, Mexico, October.

Delgado, A., L. San Andrés, and J. Justak, 2003,”Identification of Stiffness and Damping Coefficients in a Shoed Brush Seal,” Proc. VIII Congreso y Exposición Latinoamericana de Turbomaquinaria, Veracruz, Mexico, October.

 

1993-2001

San Andrés, L., and D. Wilde, 2001, “Finite Element Analysis of Gas Bearings for Oil-Free Turbomachinery,” Revue Européenne des Eléments Finis, Vol. 10 (6/7), pp. 769-790

Diaz, S., and L. San Andrés, 1999, "Noise Related to Mechanical Vibration and Repeated Impacts in a Computer Fan, an Example of a Chaotic Dynamic System," Proceedings of the VI PACAM Conference, Rio de Janeiro, Brazil, January, Applied Mechanics in the Americas, Volume 8, Dynamics, pp. 1243-1246

Baquero, F., Santiango, O., Merino, A., and L. San Andrés, 1995, "Efecto Rotodinamico de la Sustitucion de Sellos de Aceite por Sellos Secos en un Compresor Centrifugo," Memorias del V Congreso Latinoamericano de Turbomaquinaria, Acapulco, Mexico, pp. 225-230, November

Semanate J., and San Andrés, L., 1993, "A Quasi-Static Method for the Calculation of Lock-up Conditions in Floating Ring Oil Seals," Proceedings of the IV Congreso Latinoamericano de Turbomaquinaria, Queretaro, Mexico, December, pp. 55-64.