舶用推進器計晝に於けるHelmbold氏法の簡單化竝に一二の補充

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The method of calculation regarding the elements of a screw propeller was published by Dr. Helmbold and simplified by Dr. Lerbs according to Betz-Prandtl's vortex theory, and Dr. Shigemitsu also gave descriptions on similer lines. These methods require complex calculations notwithstanding the insufficient accuracy of results, and are considered not to be fully adaptable to the phenomena on marine propellers. This paper deals with the method of the first named author modified to suit application to the marine propellers in a more simplified process, and suplemented with some studies made by the writer. In such cases as when the sizes of the propeller hub of the built-up type are considerably large as not to be neglected, the correction factors are shown in fig.6 for the thrust coefficient and fig. 8 for the torque coefficient. Fig.9 is drawn to determine easily λand b_0 when C_<sh> and k_<dh> are given, and Cag. T found by use of figs. 12 and 13 and an equation, Cag. T=K.r.M. With regared to the effect of the centrifugal force, figs. 10 and 11 and a simple equation, [numerical formula] will be applicable. The wake variation within the region of the propeller disc can reasonably treated with the centrifugal force by employing the equations, tan [numerical formula] and [numerical formula] where Ka is known by Numachi's curve. Finally, the pitch angle of each blade section is the algebraic sum of βr" and incidence angle. The calculation curves and simple equations above-mentioned may be very convenient and useful for practical engineers to design marine propellers.
社団法人日本船舶海洋工学会の論文
1934-11-20

著者

湊一磨
造船統制会

舶用推進器計晝に於けるHelmbold氏法の簡單化竝に一二の補充

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