How do I design a two-stage compressor for a homemade jet turbine?

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Discussion Overview

The discussion revolves around designing a two-stage compressor for a homemade jet turbine, focusing on the challenges of air compression, blade design, and the extraction of power from exhaust gases. Participants explore various aspects of compressor design, including material selection and aerodynamic principles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • A participant expresses confusion about designing a two-stage compressor with a desired compression ratio of about 2 and a blade diameter of 20 cm, specifically seeking guidance on deriving blade angles from these parameters.
  • Another participant suggests starting with the right materials for the blades, recommending something similar to inconel and advising to look at cutaway diagrams for design inspiration.
  • A link is provided to an external resource that may contain relevant information for the design process.
  • One participant comments on the high cost of a specific item related to jet turbine components.
  • A participant mentions that the information needed is covered in books on gas turbine engines, providing links to two specific titles.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specific design approach or the necessary calculations for the compressor. Multiple viewpoints and suggestions are presented, indicating ongoing exploration and uncertainty in the design process.

Contextual Notes

Participants have not fully addressed the assumptions related to the compression ratio and blade design, and there may be unresolved mathematical steps in deriving the necessary parameters for the compressor.

Who May Find This Useful

This discussion may be useful for hobbyists and engineers interested in jet turbine design, particularly those exploring compressor mechanics and aerodynamics.

deepus
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Hey guys and gals! first time poster so be gentle...I'm wanting to make a small jet turbine from scratch but I am totally baffled by how to design the compressor and turbine stages for compressing the air and extracting power from the exhaust gas to drive the compressor.

i would ideally like a two stage compressor with a compression ratio of about 2, although the higher the better (but no more than two stages) and an blade diameter of 20 cm.
Im having difficulty with the blade angles. As iv never done aerodynamics before i need a dummies guide on how to derive the angles of the blades from compression ratio and blade diameter (if that's possible).

also can someone explain what the "turning angle" of the blade is?

any information on this is much appreciated!
 
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Start of with the right material for the blades. Use something similar to inconel. Google cutaway diagrams for a simple looking design. I always wonder how to start them myself. Sort of an odd machine to begin with.
 
Check out this link: http://minijets.org/typo3/index.php?id=58
 
41k Euros, steep!
 

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