BIOGRAPHY

Dr. Liu joined UT-CEM in March 1986.  His expertise is in the area of cooling and thermal management for high-speed electrical rotating machines, flywheels, and rail guns.  He has been responsible for thermal and cooling designs, analyses, and test validations in many programs.  He has directly or indirectly participated in virtually all thermal-related programs in UT-CEM.

Dr. Liu has been involved in the thermal designs and analyses of combat hybrid power supply systems, flywheel energy storage systems for space applications, the electromagnetic aircraft launch system, the electric gun program, and underground geothermal power tubes.  Major areas in Dr. Liu’s work include analytical predictions and test validations of windage frictional losses between rotating and stationary components of high-speed electrical machines under various operating conditions/environments and integrated transient rotor/stator thermal analyses.

Dr. Liu has been involved in the thermal designs and analyses of various electrical machines and electromagnetic devices, which include compensated pulsed alternators and electric guns for several programs, the continuous duty current collection system, the poloidal field coil of tokamak, the homopolar motor continuous liquid metal current collection system test facility, homopolar pulse consolidated electrical brushes, in-die heating of forging billets with pulsed homopolar generators, the homopolar traction motor, the transit bus flywheel battery system, electromagnetic launch packages for railgun applications, and the megawatt generator and flywheel for the advanced locomotive propulsion system.

Prior to joining UT-CEM, Dr. Liu was a graduate teaching assistant in the Department of Mechanical Engineering and a graduate research assistant at the Center for Energy Studies at the University of Texas at Austin.  His research specialty was thermal and fluid science.

RECENT PROJECTS

• Navy EMALS SDD ESS: This is a System Development and Demonstration (SDD) project that includes design, analysis, fabrication, integration, test, and support of a full scale, full length, shipboard representative Electromagnetic Aircraft Launch System (EMALS) for NAVAIR Lakehurst at New Jersey.

• ARDEC EMG-PPS Component Technology: This is a technology maturation project that includes component evaluation and test for future pulsed power supplies of electromagnetic launchers.

RESEARCH AREAS/AREAS OF INTEREST

• Thermal management for electric machines
• Integrated transient rotor/stator thermal analyses for rotating machines
• Windage frictional losses in high-speed rotating machines
• Ventilation designs and analyses for electric machine cooling

ABOUT ME (Awards, Memberships, etc.)

• Member, American Society of Mechanical Engineers (ASME)
• Member, Texas Chapter of SIGMA XI, Scientific Research Society
• Technical paper reviewer for Journal of Wear
• Technical paper reviewer for 2007International Electric Machines and Drives Conference
• Committee member for three Ph.D. candidates (University of Texas at Austin Electrical and Mechanical Engineering majors) who graduated in 1998, 2001, and 2002

EDUCATION

• Ph.D., Mechanical Engineering, University of Texas at Austin, 1985
• M.S., Mechanical Engineering, University of Texas at Austin, 1982
• B.S., Mechanical Engineering, Tatung Institute of Technology-Taiwan, 1977

PUBLICATIONS

Refereed Publications

• H-P. Liu, R.D. Lenhart, M.C. Lewis, M.D. Werst, and R.C. Zowarka “Energy storage generator thermal analysis for an electromagnetic aircraft launch system,” Classified Seminar on Applications of Electromagnetic Launch Technology, Washington, DC, May 2-4, 2007 (PR 452).

• C.S. Hearn, J.J. Hahne, H-P. Liu, M.D. Werst, “Thermoplastic applications for pulsed power alternators,” 13th Electromagnetic Launch Technology Symposium, Potsdam (Berlin), Germany, May 22-25, 2006, IEEE Transactions on Magnetics, vol. 43, no. 1, January 2007, pp. 238-241 (PR 417).

• H-P. Liu, V. Lelos, and C.S. Hearn, “Transient 3D thermal analysis for an air-cooled induction motor,” IEEE International Electric Machines and Drives Conference, San Antonio, Texas, U.S.A., May 15-18, 2005 (PR 381).

• H-P. Liu, C.S. Hearn, M.D. Werst, J.J. Hahne, and D. Bogard, “Splits of windage losses in integrated transient rotor and stator thermal analysis of a high speed compulsator during multiple discharges,” IEEE Transactions on Magnetics, vol. 41, no. 1, January 2005, pp. 311-315 (PR 358).

• H-P. Liu, M.D. Werst, J.J. Hahne, and D. Bogard, “Investigation of windage splits in an enclosed test fixture having a high speed composite rotor in low air pressure environments,” IEEE Transactions on Magnetics, vol. 41, no. 1, January 2005, pp. 316-321 (PR 349).

• J.J. Hahne, H-P. Liu, C.S. Hearn, E. Schroeder, and J. O’Rarden, “Empirical data on high flow rate coolants in copper tubing and the effects on the coolant’s electrical resistivity,” IEEE Transactions on Magnetics, vol. 41, no. 1, January 2005 (PR 346).

• J.J. Hahne, M.D. Werst, C.E. Penney, H-P. Liu, J. O’Rarden, D. Bogard, “Measurement of windage losses and temperature distribution for a high speed composite rotor in a stator assembly at low air pressures,” ASME Summer Heat Transfer Conference, Las Vegas, Nevada, U.S.A., July 21-23, 2003, paper #HT 2003-47117 (PR 338).

• H-P. Liu, M.D. Werst, J.J. Hahne, and D. Bogard, “Prediction of windage losses of an enclosed high speed composite rotor in low air pressure environments,” ASME Summer Heat Transfer Conference, Las Vegas, Nevada, U.S.A., July 21-23, 2003, paper #HT 2003-47118 (PR 337).

• M.D. Werst, J.J. Hahne, H-P. Liu, and C.E. Penney, “Design and testing of a high-speed spin test for evaluation pulse alternator windage loss effects,” IEEE Transactions on Magnetics, vol. 39, no. 1, January 2003, pp. 389-393 (PR 310).

• H-P. Liu and J.J. Hahne, “High-speed compulsator stator thermal management,” IEEE Transactions on Magnetics, vol. 39, no. 1, January 2003, pp. 357-361 (PR 303).

• T.A. Aanstoos, et al., “High voltage stator for a flywheel energy storage system,” IEEE Transactions on Magnetics, vol. 37, no. 1, January 2001, pp. 242-247 (PR 284).

• H-P. Liu, Y.L. Ting, R.C. Zowarka, and A. Alexander, “Electromagnetic and structural analyses of an integrated launch package,” IEEE Transactions on Magnetics, vol. 35, no. 1, January 1999, pp. 74-78 (PR 254).

• J.H. Price, et al., “Discarding armature and barrel optimization for a cannon caliber electromagnetic launcher system,” IEEE Transactions on Magnetics, vol. 31, no. 1, January 1995, pp. 25-30 (PR 196).

• M.D. Werst, et al., “Design and testing of a rapid fire, lightweight, ultra stiff railgun for a cannon caliber electromagnetic launcher system,” IEEE Transactions on Magnetics, vol. 31, no. 1, January 1995, pp. 365-370 (PR 189).

• H-P. Liu, R.W. Carnes Jr., and J.H. Gully, “Effect of temperature on wear rate of homopolar pulse consolidated electrical brush,” Journal of Wear, vol. 167, 1993, pp. 41-47 (PR 179).

• H-P. Liu, R.W. Carnes, and J.H. Gully, “Measurement and prediction of brush interface temperature at sliding electrical contacts,” Proceedings, 38th IEEE Holm Conference on Electrical Contacts, Philadelphia, Pennsylvania, U.S.A., October 18-21, 1992, pp. 143-148 (PR 173).

• H-P. Liu, “Three-dimensional rail cooling analysis for a repetitively fired railgun,” IEEE Transactions on Magnetics, vol. 27, no. 1, January 1991, pp. 68-73 (PR 102).

• H-P. Liu, “Cooling for the armature windings in a repetitively fired air-core compulsator,” IEEE Transactions on Magnetics, vol. 25, no. 1, January 1989, pp. 334-341 (PR 70).

• W.A. Walls, et al., “Design of a self-excited, air-core compulsator for a skid-mounted, repetitive fire 9 MJ railgun system,” IEEE Transactions on Magnetics, vol. 25, no. 1, January 1989, pp. 574-579 (PR 64).

• H-P. Liu and J.R. Howell, “Scale modeling of radiation in enclosures with absorbing/emitting and isotropically scattering media,” ASME Journal of Heat Transfer, vol. 109, no. 2, 1987, pp. 470-477.

• H-P. Liu and J.R. Howell, “Measurement of radiative exchange factors,” ASME/AIChE National Heat Transfer Conference, HTD, vol. 45, Denver, Colorado, U.S.A., August 4-7, 1985, pp. 259-264.

Non-refereed Publications

• M.D. Werst, et al., “Rapid fire railgun for the cannon caliber electromagnetic gun system,” Digest of Technical Papers, 10th IEEE Pulsed Power Conference, Albuquerque, New Mexico, U.S.A., July 10-13, 1995, vol. 1, pp. 174-179 (PN 228).

• S.B. Pratap, et al., “Optimization and design of the air core compulsator for the cannon caliber electromagnetic launcher system (CCEML),” Digest of Technical Papers, 9th IEEE International Pulsed Power Conference, Albuquerque, New Mexico, U.S.A., June 21-23 1993, vol. 1, p. 29 (PN 213).

• J.R. Kitzmiller, et al., “Power Supply Design for the Cannon Caliber Electromagnetic Launcher System (CCEML),” 1993 Gun and Ammunition Technical Symposium, Monterey, California, U.S.A., April 21-23, 1993 (PN 209).

• J.H. Price, K.G. Cook, H-P. Liu, M.D. Werst, and H.D. Yun, “Discarding armature and barrel optimization for a cannon caliber electromagnetic launcher system,” 1993 Gun and Ammunition Technical Symposium, Monterey, California, U.S.A., April 21-23, 1993 (PN 208).