Cavitation instabilities of an inducer in LOX pump = 산화제펌프 인듀서의 캐비테이션 불안정성

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Inducers are critical to the minimization of the degradation of a liquid oxygen (LOX) pump and the maximization of the thrust-to-weight ratio of liquid rocket engines, but create cavitation instabilities that have adverse effects on its reliabilities. To examine the cavitation instabilities of an inducer in a LOX pump, two kinds of working fluids, water and liquid oxygen, were employed. The cavitation instabilities were measured with an accelerometer installed on the pump casing, instead of pressure pulsation sensors, which are complicated to install. The flow coefficient and the head slightly decrease with decreases in the cavitation number before the cavitation breakdown. Several cavitation instabilities were clearly identified with the accelerometer regardless the fluids. Especially the super-synchronous rotating cavitation and asymmetric cavitation are dominant in accelerometer signals, which had radial impacts on the rotordynamcis. The features of the instabilities are well-matched with the previous studies and the pressure pulsation sensor data. In addition, the fluids effects were explored. When flow coefficients were 0.09 and 0.10, super-synchronous rotating cavitation was found in a similar cavitation number range for both fluids. Whereas, when the flow coefficient was 0.11, the cavitation numbers of the cavitation instabilities in the liquid oxygen test are smaller than those of the water test.
Advisors
Sung, Hyung Jinresearcher성형진researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학과, 2017.2,[vii, 67 p. :]

Keywords

LOX pump; Inducer; Cavitation instability; Super-synchronous rotating cavitation; Asymmetric cavitation; 산화제펌프; 인듀서; 캐비테이션 불안정성; 초조화 선회 캐비테이션; 비대칭 캐비테이션

URI
http://hdl.handle.net/10203/241692
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675621&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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