Lecture 6: Introduction to Propellers - 2023/24

Introduction to propellers 280667 Propellers - Joel Jurado Granados 1 2023/24 Power itemization 280667 Propellers - Joel Jurado Granados 2 2023/24 ...

Introduction to propellers 280667 Propellers - Joel Jurado Granados 1 2023/24 Power itemization 280667 Propellers - Joel Jurado Granados 2 2023/24  What to learn Propeller description. Main features. WHERE TO FIND Theoretical fundamentals J. Carlton, Marine Propellers Test data. SNAME, Principles of Naval Hull interaction. Architecture, Vol. 2 Cavitation. F. White, Fluid Mechanics. Types. A. Molland, Resistance and Choose propeller from ship requirements. Propulsion. 280667 Propellers - Joel Jurado Granados 3 2023/24 Introduction 280667 Propellers - Joel Jurado Granados 4 2023/24 Introduction 280667 Propellers - Joel Jurado Granados 5 2023/24 How does it work Newton’s second law 280667 Propellers - Joel Jurado Granados 6 2023/24 How does it work 280667 Propellers - Joel Jurado Granados 7 2023/24  How does it work. Theories Momentum theory Blade element theory Circulation theory 280667 Propellers - Joel Jurado Granados 8 2023/24 How does it work. Theories  280667 Propellers - Joel Jurado Granados 9 2023/24 How does it work. Kutta-Joukowsky Flow leaves the trailing edge (T.E.) smoothly. Sharp T.E, there is a stagnation point. ‘Cusped’ T.E (parallel surfaces), 280667 Propellers - Joel Jurado Granados 10 2023/24  Geometry. 280667 Propellers - Joel Jurado Granados 11 2023/24 Geometry. Velocity triangle 280667 Propellers - Joel Jurado Granados 12 2023/24 Geometry 280667 Propellers - Joel Jurado Granados 13 2023/24 Geometry. Pitch angle Pitch ratio = 280667 Propellers - Joel Jurado Granados 14 2023/24 Geometry. Pitch, propeller view 280667 Propellers - Joel Jurado Granados 15 2023/24 Geometry. Pitch 280667 Propellers - Joel Jurado Granados 16 2023/24 Geometry. Rake & skew angles SKEW RAKE 280667 Propellers - Joel Jurado Granados 17 2023/24  Geometry 280667 Propellers - Joel Jurado Granados 18 2023/24 Geometry. Helicoidal blade (hence, propeller) 280667 Propellers - Joel Jurado Granados 19 2023/24 Geometry. Helicoidal blade (hence, propeller) Pitch angle is function of local radius. 280667 Propellers - Joel Jurado Granados 20 2023/24  Geometry 280667 Propellers - Joel Jurado Granados 21 2023/24 Model propeller tests. Angle of attack influence A B LIFT? (use intuition) C D 280667 Propellers - Joel Jurado Granados 22 2023/24 Model propeller tests. Angle of attack influence (graph for asymmetric airfoil) 280667 Propellers - Joel Jurado Granados 23 2023/24 Model propeller tests. Factors. Applying Th. Pi Buckingham. 280667 Propellers - Joel Jurado Granados 24 2023/24 Model propeller tests. Rn influence Keep Reynolds high!! 280667 Propellers - Joel Jurado Granados 25 2023/24 Model propeller tests. Open waters 280667 Propellers - Joel Jurado Granados 26 2023/24 Model propeller tests. Open waters 280667 Propellers - Joel Jurado Granados 27 2023/24  Model propeller tests. Open waters Operation conditions: – Work – Bollard Pull – Non-thrust. – Relation between and. Similarity laws: – How to obtain same and between prototype and model? – Scale factor? 280667 Propellers - Joel Jurado Granados 28 2023/24