TY - JOUR
T1 - Multiphase marine ramjet using liquefied gas as a source of bubbles
AU - Haustein, Herman D.
AU - Gany, Alon
AU - Elias, Ezra
N1 - Publisher Copyright:
© 2020 by the authors.
PY - 2020/9
Y1 - 2020/9
N2 - 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.
AB - 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.
KW - Boiling expansion work
KW - Bubbly jet
KW - Liquefied gas
KW - Marine ramjet
KW - Phase transfer propulsion
KW - Two phase jet propulsion
KW - Underwater propulsion
UR - http://www.scopus.com/inward/record.url?scp=85092150597&partnerID=8YFLogxK
U2 - 10.3390/JMSE8090710
DO - 10.3390/JMSE8090710
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AN - SCOPUS:85092150597
VL - 8
JO - Journal of Marine Science and Engineering
JF - Journal of Marine Science and Engineering
SN - 2077-1312
IS - 9
M1 - 710
ER -
