Heuristic guess

[lasseband]

Develop method for generating an heuristic initial guess for each component.

• [x] Framework
• [ ] Impeller
• [ ] Vaned diffuser
• [ ] Vaneless diffuser
• [ ] Volute

Here are a list of ideas for how to generate guesses:

Impeller

• Guess impeller $\eta{tt}$ and $\phi = v{m,out}/u_{out}$
• Calculate slip according to slip-correlation (e.g. Wiesner)
• Calculate total pressure ratio for perfect gas (from Dixon)

Vaneless diffuser

• Assume constant flow angle (like in the derivation of tangential momentum balance)
• Calculate exit velocity using simple friction factor in angular momentum conservation
• (The above require no guess)

Vaned diffuser

• Assume zero deviation

Volute

• Assume incompressible flow
• Assume single velocity component at exit
• (The above require no guess)