Power cycle analysis of two-phase underwater ramjet |
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Affiliation: | 1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygin str., Moscow 119991, Russia;2. Center for Pulse Detonation Combustion, 4 Kosygin str., Moscow 119991, Russia;3. National Nuclear Research University “MEPhI”, 31 Kashirskoe shosse, Moscow 115409, Russia;4. AVL LIST GmbH, A-8020 Graz, Hans-List-Platz 1, Austria |
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Abstract: | To predict the cycle and propulsive performance, and further instruct the integral engine design, an ideal power cycle model for a two-phase underwater ramjet is established. Four performance parameters are defined to evaluate overall performance of the two-phase underwater ramjet systems: transmission efficiency, propulsive efficiency, overall efficiency and specific impulse. Then, a scaled-down experimental ramjet engine was tested in a direct-connect ground testing system to validate the present model, and the predictions with present model compare favorably with experimental results. Subsequently, the influences of cruise velocity, air/water mass ratio and cruising depth on the theoretical performance of the two-phase underwater ramjet are discussed. The results indicate that one of the most outstanding advantages of two-phase underwater ramjet is its high propulsive efficiency with the order of 50–95%. As a result, the overall efficiency magnitude are as high as 30% at cruise speed of 100 m/s. Furthermore, regarding rules of specific impulse vs cruise velocity under a certain air/water mass ratio, the occurrence of peak specific impulse of order 400 s is observed. |
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Keywords: | Underwater propulsion Ramjet Power cycle Performance measures |
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