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Article

Multiphase Marine Ramjet Using Liquefied Gas as a Source of Bubbles

by
Herman D. Haustein
1,
Alon Gany
2,* and
Ezra Elias
3
1
School of Mechanical Engineering, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 6997801, Israel
2
Faculty of Aerospace Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel
3
Faculty of Mechanical Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(9), 710; https://doi.org/10.3390/jmse8090710
Submission received: 18 August 2020 / Revised: 10 September 2020 / Accepted: 11 September 2020 / Published: 14 September 2020
(This article belongs to the Section Ocean Engineering)
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Abstract

An innovative variant of a multiphase marine ramjet is investigated analytically and experimentally. Pressure liquefied gas (LG) is injected, boiling under superheat conditions in the water stream within the propulsion unit, and serving as an on-board bubble source necessary for the ramjet operation. Experiments were conducted in a 10 m diameter tow pool at a speed range of 7–18 m/s (approximately 14–35 knots). For the laboratory concept demonstration and process characterization, two liquefied gases, butane and R134a (synthetic refrigerant gas), were employed. In practical applications, non-polluting LGs such as liquid air may be used. The results reveal the overall performance comparable to the operation with pressurized air, with some thrust advantage of the LG at high-speed tests, attributed to the volume increase of gas during phase change, in accordance with the thermodynamic power cycle analysis.
Keywords: marine ramjet; phase transfer propulsion; boiling expansion work; liquefied gas; bubbly jet; underwater propulsion; two phase jet propulsion marine ramjet; phase transfer propulsion; boiling expansion work; liquefied gas; bubbly jet; underwater propulsion; two phase jet propulsion

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MDPI and ACS Style

Haustein, H.D.; Gany, A.; Elias, E. Multiphase Marine Ramjet Using Liquefied Gas as a Source of Bubbles. J. Mar. Sci. Eng. 2020, 8, 710. https://doi.org/10.3390/jmse8090710

AMA Style

Haustein HD, Gany A, Elias E. Multiphase Marine Ramjet Using Liquefied Gas as a Source of Bubbles. Journal of Marine Science and Engineering. 2020; 8(9):710. https://doi.org/10.3390/jmse8090710

Chicago/Turabian Style

Haustein, Herman D., Alon Gany, and Ezra Elias. 2020. "Multiphase Marine Ramjet Using Liquefied Gas as a Source of Bubbles" Journal of Marine Science and Engineering 8, no. 9: 710. https://doi.org/10.3390/jmse8090710

APA Style

Haustein, H. D., Gany, A., & Elias, E. (2020). Multiphase Marine Ramjet Using Liquefied Gas as a Source of Bubbles. Journal of Marine Science and Engineering, 8(9), 710. https://doi.org/10.3390/jmse8090710

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