Study on the Gas-liquid Flow Characteristics in the Reversing Bucket of Water Jet Propulsion

Pan, Zhenhua; Cen, Chunhai; Zong, Ping; Fall, Ibra; Yang, Bo

doi:10.5293/ijfms.2020.13.2.455

Cited by 1 publication

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“…6 Our research on the flow in reversing bucket found that moderate gas in the flow can augment the reversing force. 7 As most of the waterjet systems are flush mounted in the vessel hulls, the interaction effects of them are unanswered and critical questions to both the naval architects and the waterjet manufacturers. Eslamdoost et al 8 proposed a pressure jump method for modeling waterjet/hull interaction that may be used in combination with both potential flow/boundary layer methods and more advanced viscous flow methods.…”

Section: Introductionmentioning

confidence: 99%

Scaling of on-board characteristics of waterjet propulsion based on bench thrust testing data and loop test results

Pan

2021

Advances in Mechanical Engineering

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The on-board “speed-resistance-power” curves are profiled by a fitted jet thrust deduction factor relation, where the raw data are obtained from both bench thrust testing data and loop test results. Firstly, the thrust characteristics of a waterjet were tested by a thrust testing bench, while the pump performance such as capacity, head and shaft power of the waterjet was measured on a loop test rig. The useful fitted jet thrust deduction factor relation involves three related variables, that is to say, thrust coefficient, torque coefficient, and advance coefficient. Then, the best efficiency propulsion points are indicated by a collapsing technology and the subsequent results that the best efficiency propulsion points are actually existed. Cavitation margins are also noted by the two groups of data obtained by the loop data and the bench data, respectively. The discrepancy of the two margins shows the measuring error of the loop test means. In addition, the non-consistency features of the curves in the cavitation zone indicate the complex cavitation instabilities in the waterjet propulsion. At last, the bench tested thrust results are supplemented and therefore a useful map is completed.

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Section: Introductionmentioning

confidence: 99%