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Research Papers

The Effect of Real Gas Approximations on S-CO2 Compressor Design

[+] Author and Article Information
Jekyoung Lee

Korea Advanced Institute of
Science and Technology,
KAIST 291,
Daehak-ro, Yuseong-gu,
Daejeon 34141, South Korea
e-mail: leejaeky85@kaist.ac.kr

Seong Kuk Cho

Korea Advanced Institute of
Science and Technology,
KAIST 291,
Daehak-ro, Yuseong-gu,
Daejeon 34141, South Korea
e-mail: skcho89@kaist.ac.kr

Jeong Ik Lee

Korea Advanced Institute of
Science and Technology,
KAIST 291,
Daehak-ro, Yuseong-gu,
Daejeon 34141, South Korea
e-mail: jeongiklee@kaist.ac.kr

Manuscript received November 7, 2017; final manuscript received November 22, 2017; published online April 6, 2018. Editor: Kenneth Hall.

J. Turbomach 140(5), 051007 (Apr 06, 2018) (9 pages) Paper No: TURBO-17-1208; doi: 10.1115/1.4038879 History: Received November 07, 2017; Revised November 22, 2017

From the efforts of many researchers and engineers related to the S-CO2 Brayton cycle technology development, the S-CO2 Brayton cycle is now considered as one of the key power technologies for the future. Since the S-CO2 Brayton cycle has advantages in economics due to high efficiency and compactness of the system, various industries have been trying to develop baseline technology on the design and analysis of the S-CO2 Brayton cycle components. According to the previous researches on the S-CO2 Brayton cycle component technology, the treatment of a thermodynamic property near the critical point of CO2 is one of the main concerns since conventional design and analysis methodologies cannot be used for the near critical point region. Among many thermodynamic properties, the stagnation to static condition conversion process is important since the flow in a compressor is at high flow velocity. In this paper, the impact of various stagnation to static conversion methods on the S-CO2 compressor design near the critical point will be evaluated. From the evaluation, the limitation of a certain stagnation to static conversion method will be discussed to provide a guideline for the future S-CO2 compressor designers.

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Figures

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Fig. 1

Specific heat ratio variation of S-CO2 near the critical point

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Fig. 2

Calculation procedure of definition based static to stagnation conversion

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Fig. 3

Static condition conversion error of ideal gas based conversion result to definition based conversion result (left: temperature conversion error and right: pressure conversion error)

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Fig. 4

Static condition conversion error of real gas isentropic exponent based conversion result to definition based conversion result (left: temperature conversion error and right: pressure conversion error)

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Fig. 5

Static enthalpy conversion error of real gas isentropic exponent based conversion result to definition based conversion result

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Fig. 6

Static enthalpy conversion error of averaged real gas isentropic exponent based conversion result to definition based conversion result

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Fig. 7

Impeller velocity triangles

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Fig. 8

Design optimization procedure of KAIST_TMD

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Fig. 9

Impeller design optimization history

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Fig. 10

Velocity triangle comparison at impeller outlet

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Fig. 11

Geometry comparison of optimum designs with different static to stagnation conversion approximations (normalized by impeller outlet radius of “real gas—numerical” case)

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Fig. 12

S-CO2 Brayton cycle thermal efficiency variation with different compressor efficiencies

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Fig. 13

Error on impeller outlet velocity triangle along the inlet temperature

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Fig. 14

Error on inlet condition conversion along the inlet temperature

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Fig. 15

Error on geometry design along the inlet temperature

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Fig. 16

Impeller outlet radius design error under given T-P plane

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