A few
papers & tech presentations (3/24/23)
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
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
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.