Open-Water Thrust and Torque Predictions of a Ducted Propeller System with a Panel Method

Table 1

Variation with the duct boundary layer thickness of the relative differences between the predicted and experimental (exp) thrust and torque coefficients. Ka4-70 inside duct 19Am at 𝐽=0.5. Transpiration velocity gap model.

𝛿/𝑅	(𝐾𝑇𝑃−𝐾𝑇𝑃exp)/𝐾𝑇𝑃exp	(𝐾𝑇𝑃+𝐷−𝐾𝑇𝑃+𝐷exp)/𝐾𝑇𝑃+𝐷exp	(𝐾𝑄−𝐾𝑄exp)/𝐾𝑄exp
0.0%	19.8%	17.2%	11.9%
1.0%	8.4%	9.0%	3.2%
2.0%	0.4%	4.0%	−3.0%
3.0%	−1.5%	2.2%	−4.3%
4.0%	−3.3%	0.2%	−5.9%
5.0%	−6.1%	−0.8%	−8.1%