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Title: Flow and heat transfer model for a rotating cryogenic motor

Abstract

Development of a high-temperature, superconducting, synchronous motor for large applications (>1000 HP) could offer significant electrical power savings for industrial users. Presently 60% of all electric power generated in the United States is converted by electric motors. A large part of two power is utilized by motors 1000 HP or larger. The use of high-temperature superconducting materials with critical temperatures above that of liquid nitrogen (77 K) in the field winding would reduce the losses in these motors significantly, and therefore, would have a definite impact on the electrical power usage in the US. These motors will be 1/3 to 1/2 the size of conventional motors of similar power and, thus, offer potential savings in materials and floor space. The cooling of the superconducting materials in the field windings of the rotor presents a unique application of cryogenic engineering. The rotational velocity results in significant radial pressure gradients that affect the flow distribution of the cryogen. The internal pressure fields can result in significant nonuniformities in the two-phase flow of the coolant. Due to the variable speed design, the flow distribution has the potential to change during operation. A multiphase-flow computer model of the cryogenic cooling is developed to calculatemore » the boiling heat transfer and phase distribution of the nitrogen coolant in the motor. The model accounts for unequal phase velocities and nonuniform cooling requirements of the rotor. The unequal radial pressure gradients in the inlet and outlet headers result in a larger driving force for flow in the outer cooling channels. The effect of this must be accounted for in the design of the motor. Continuing improvements of the model will allow the investigation of the transient thermal issues associated with localized quenching of the superconducting components of the motor.« less

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States); Electric Power Research Inst., Palo Alto, CA (United States)
OSTI Identifier:
10185933
Report Number(s):
SAND-93-1588
ON: DE94001151
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Aug 1993
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; SUPERCONDUCTING MOTORS; THERMAL ANALYSIS; HEAT TRANSFER; HEAT FLOW; CRYOGENICS; COMPUTER CALCULATIONS; COOLING; MATHEMATICAL MODELS; 665412; SUPERCONDUCTING DEVICES

Citation Formats

Dykhuizen, R C, Baca, R G, and Bickel, T C. Flow and heat transfer model for a rotating cryogenic motor. United States: N. p., 1993. Web. doi:10.2172/10185933.
Dykhuizen, R C, Baca, R G, & Bickel, T C. Flow and heat transfer model for a rotating cryogenic motor. United States. doi:10.2172/10185933.
Dykhuizen, R C, Baca, R G, and Bickel, T C. Sun . "Flow and heat transfer model for a rotating cryogenic motor". United States. doi:10.2172/10185933. https://www.osti.gov/servlets/purl/10185933.
@article{osti_10185933,
title = {Flow and heat transfer model for a rotating cryogenic motor},
author = {Dykhuizen, R C and Baca, R G and Bickel, T C},
abstractNote = {Development of a high-temperature, superconducting, synchronous motor for large applications (>1000 HP) could offer significant electrical power savings for industrial users. Presently 60% of all electric power generated in the United States is converted by electric motors. A large part of two power is utilized by motors 1000 HP or larger. The use of high-temperature superconducting materials with critical temperatures above that of liquid nitrogen (77 K) in the field winding would reduce the losses in these motors significantly, and therefore, would have a definite impact on the electrical power usage in the US. These motors will be 1/3 to 1/2 the size of conventional motors of similar power and, thus, offer potential savings in materials and floor space. The cooling of the superconducting materials in the field windings of the rotor presents a unique application of cryogenic engineering. The rotational velocity results in significant radial pressure gradients that affect the flow distribution of the cryogen. The internal pressure fields can result in significant nonuniformities in the two-phase flow of the coolant. Due to the variable speed design, the flow distribution has the potential to change during operation. A multiphase-flow computer model of the cryogenic cooling is developed to calculate the boiling heat transfer and phase distribution of the nitrogen coolant in the motor. The model accounts for unequal phase velocities and nonuniform cooling requirements of the rotor. The unequal radial pressure gradients in the inlet and outlet headers result in a larger driving force for flow in the outer cooling channels. The effect of this must be accounted for in the design of the motor. Continuing improvements of the model will allow the investigation of the transient thermal issues associated with localized quenching of the superconducting components of the motor.},
doi = {10.2172/10185933},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {8}
}