Object and purpose of research. This paper analyses the quasi-crash-stop model test data for propellers in open water and behind the hull of self-propelled ship models, as well as justifies a new method for presentation of the results and gives an approximate estimate for propeller-hull interaction in quasi-crash-stop conditions. Materials and methods. The study analyses existing methods for presentation of quasi-crash-stop propeller test data and justifies a new method that presents generalized thrust and torque coefficients as functions of βA,B angle at which JA,B = tan βA,B, where JA,B is advance ratio (A) or apparent advance (B) of the propeller. This method is extended to quasi-crash-stop tests of self-propelled ship models that give more complete information on crash-stop propeller parameters. The approximate analysis of hull-propeller interaction in various crash-stop scenarios given in this study has shown that actual thrust deduction coefficients and wake fractions of propellers are considerably different from those adopted at the design stage. Main results. The paper justifies a new method of quasi-crash-stop test data for propellers in open water and behind the hull, and also shows that actual propeller-hull interaction coefficients are different from those adopted at propeller design stage. Therefore, for practical purposes, quasi-crash-stop tests are preferable to perform on self-propelled models rather than isolated propellers. Conclusion. This paper could be helpful for quasi-crash-stop tests and design of propellers.
On quasi-crash-stop model tests of marine propellers
2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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