03kt_kq_design

# 03kt_kq_design - Using KT and KQ for design these notes are...

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Using K T and K Q for design these notes are landscape as plots are usually shown in that mode we have seen in general the development of the Wageningen B series. The performance curves are available either in chart form or can be generated from polynomials: regression coeff. Re=2*10^6 polynomial representation use in design A typical design problem calls for designing a propeller that will provide the required thrust at a given speed of advance. These parameters result from applying thrust deduction and wake fraction to resistance and ship velocity respectively. Design will imply selecting a P/D from a B-series plot that will maximize open water efficiency. For now we will arbitrarily pick a number of blades and expanded area ratio. Later we will address the criteria in their selection. Reviewing the non-dimensional forms of the parameters associated with thrust and speed: T V A K T = J = we have independent variables n and D. Normally one of these is determined by other criteria, e.g. maximum diameter ρ⋅ n 2 D 4 nD by hull form, or n by the propulsion train design, so we will look at two cases, one in which D is fixed - determine n,

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## This note was uploaded on 02/24/2012 for the course MECHANICAL 2.611 taught by Professor Davidburke during the Fall '06 term at MIT.

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03kt_kq_design - Using KT and KQ for design these notes are...

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