scholarly journals Geometry features and performance characteristics of an inland marine propeller

2015 ◽  
Vol 18 (4) ◽  
pp. 110-116
Author(s):  
Hieu Khanh Ngo ◽  
Hien Tat Le
Keyword(s):  
Laser Scanning ◽  
Reference Value ◽  
Performance Characteristics ◽  
Ho Chi Minh City ◽  
Marine Propeller ◽  
Operating Characteristics ◽  
Data Points ◽  
And Performance ◽  
Ship Propeller ◽  
Coordinate Data

Review performance characteristics of a marine propeller should be based on its geometric properties and the design standard of marine propeller. Based on an inland ship propeller which is currently widely used in the Ho Chi Minh city, the article provides a method of building a 3D model of this propeller from its coordinate data points obtained by a laser scanning devices. Then surveying the geometric characteristics of the marine propeller through 3D scanning, and making comparisons with the marine propeller manufacturing standards in the world in order to estimate the operating characteristics of this marine propeller. The analysis results obtained in the article can be used as a reference value for the simulation results of the characteristics of this insland marine propeller, as well as the experimental results on a miniature model of this propeller.

Acoustic and Performance Characteristics of an Ideally Twisted Rotor in Hover

2021 ◽  
Author(s):  
Nicole A. Pettingill ◽  
Nikolas S. Zawodny ◽  
Christopher Thurman ◽  
Leonard V. Lopes
Keyword(s):  
Performance Characteristics ◽  
And Performance

Effect of the turning angle on the flow and performance characteristics of long S-shaped circular diffusers

2003 ◽  
Vol 217 (1) ◽  
pp. 29-41 ◽  
Author(s):  
R B Anand ◽  
L Rai ◽  
S N Singh
Keyword(s):  
Total Pressure ◽  
Static Pressure ◽  
Area Ratio ◽  
Secondary Flows ◽  
Performance Characteristics ◽  
Pressure Recovery ◽  
Recovery Coefficient ◽  
Turning Angle ◽  
And Performance ◽  
Pressure Recovery Coefficient

The effect of the turning angle on the flow and performance characteristics of long S-shaped circular diffusers (length-inlet diameter ratio, L/Di = 11:4) having an area ratio of 1.9 and centre-line length of 600 mm has been established. The experiments are carried out for three S-shaped circular diffusers having angles of turn of 15°/15°, 22.5°/22.5° and 30°/30°. Velocity, static pressure and total pressure distributions at different planes along the length of the diffusers are measured using a five-hole impact probe. The turbulence intensity distribution at the same planes is also measured using a normal hot-wire probe. The static pressure recovery coefficients for 15°/15°, 22.5°/22.5° and 30°/30° diffusers are evaluated as 0.45, 0.40 and 0.35 respectively, whereas the ideal static pressure recovery coefficient is 0.72. The low performance is attributed to the generation of secondary flows due to geometrical curvature and additional losses as a result of the high surface roughness (~0.5 mm) of the diffusers. The pressure recovery coefficient of these circular test diffusers is comparatively lower than that of an S-shaped rectangular diffuser of nearly the same area ratio, even with a larger turning angle (90°/90°), i.e. 0.53. The total pressure loss coefficient for all the diffusers is nearly the same and seems to be independent of the angle of turn. The flow distribution is more uniform at the exit for the higher angle of turn diffusers.

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