University:
Boston University
Course:
CAS PY 105 | Physics 1
Academic year:

2023
Views:

480

Pages:

10
Author:

babyzhuxlh9

FLOW THROUGH A DE LAVAL NOZZLE 1 Nozzles change flow speeds by changing the area through which the fluid flows 2 We can gain physical insight about the flow using the governing equations 3 We can gain physical insight about the flow using the governing equations 4 Nothing too interesting happens in the subsonic case Signs are opposite: As area increases, speed decreases Thinking about a nozzle: Starts slow, speeds up in the throat, then slows down again. 5 In the supersonic case, get smooth acceleration throughout the nozzle Signs are the same: As area increases, speed increases Thinking about a nozzle: Starts slow, speeds up in the throat, then continues to speed up! This is known as a de Laval nozzle. 6 Transforming subsonic flow into supersonic flow has many applications For example: Going to the moon. 7 There are also astrophysical applications: Solar wind Parker (1963) 8 Constructing the mesh for the nozzle 1 r[m] 0 z[m] 2 Cells: 400 x 200 Transfinite scaling: 0.95 9 Constructing the mesh for the nozzle 1 r[m] 0 z[m] 2 Cells: 400 x 200 Transfinite scaling: 0.95 10