MIT 2 611 - Propeller Design Assignment (3 pages)

Previewing page 1 of 3 page document View the full content.
View Full Document

Propeller Design Assignment



Previewing page 1 of actual document.

View the full content.
View Full Document
View Full Document

Propeller Design Assignment

57 views

Other


Pages:
3
School:
Massachusetts Institute of Technology
Course:
2 611 - Marine Power and Propulsion

Unformatted text preview:

Propeller Design Assignment Fall 2006 A lifting line code PVL is setup and run for a particular propeller design The input file and resulting design output file are attached The input file gives the operating point specifics as well as the inflow distribution and design chordlength distribution on the propeller The full scale propeller runs on a ship with the following characteristic Diameter 5 m Ship Speed 13 m s RPM 156 Required Propeller thrust 991 5 kN Depth at Prop Centerline 8m Vapor pressure 2500 Pa Water Density 997 kg m3 Axial inflow velocity variation 1 m s The output file shows the non dimensional circulation distribution G induced velocities Flow angles and drag coefficient 1 Find the optimal efficiency for this propeller from Kramer s Diagram Using the data for a NACA a 0 8 meanline and NACA 65A010 Thickness section determine the blade section design at the r R 0 697 radius The max thickness of this section is chosen at to C 0 04 2 Find the lift coefficient for this section as well as the camber ration fo c and proper angle of attack 3 Determine the blade angle and pitch P D for this section 4 Will this section cavitate at this radius under the design operating conditions for this ship Use Brockett diagram to estimate 5 Use the matlab m file vlm m provided to analyze the 2D section at ideal angle of attack Plot the pressure distribution Cp vs chordwise position At what position on the blade would cavitation first occur under these conditions PVL input file 32 NUMBER OF VORTEX PANELS OVER THE RADIUS 10 MAXIMUM ITERATIONS IN WAKE ALIGNMENT 1 HUB IMAGE FLAG 1 YES 0 NO 0 5 HUB VORTEX RADIUS HUB RADIUS 11 NUMBER OF INPUT RADII 5 NUMBER OF BLADES 1 0 ADVANCE COEFFICIENT J BASED ON SHIP SPEED 0 600 DESIRED THRUST COEFFICIENT CT 0 000 HUB UNLOADING FACTOR 0 0 OPTIMUM NO UNLOADING 0 000 TIP UNLOADING FACTOR 1 0 REDUCED LOADING 1 000 CRP SWIRL CANCELLATION FACTOR 1 0 NO CANCELLATION r R c D Cd Va Vs Vt Vs 0 20000 0 17400 0 00800 1 00000 0 00000 0 25000 0 19700 0



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Propeller Design Assignment and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Propeller Design Assignment and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?