A simple real-world fluid dynamics question:

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Discussion Overview

The discussion revolves around the design considerations for charge pipes in a custom turbocharger setup, specifically focusing on the fluid dynamics of different bend configurations. Participants explore the implications of various pipe shapes and bends on the flow of compressed air.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests comparing three different configurations of bends in the charge pipes to determine which is more restrictive to airflow.
  • Another participant questions the simplicity of the problem, asking for additional details such as the total angle of the turn, pipe diameter, pressure, temperature, and length of the straight sections.
  • A later reply clarifies that the total turn is a full 180 degrees and provides specific parameters: a 2.5" diameter pipe, approximately 70 degrees F, and 8 lb/in² pressure, with straight sections of about 6" max.
  • One participant proposes that a U-shaped pipe would be the best option for a full 180-degree turn, but notes that space constraints prevent this design.
  • Another participant emphasizes the importance of having smooth turns and avoiding hard edges in the design.
  • There is a reiteration that all bends will be mandrel bends, which are typically smoother than standard bends.

Areas of Agreement / Disagreement

Participants express varying opinions on the best design for the charge pipes, with no consensus reached on which configuration is optimal. Some agree on the importance of smooth bends, while others emphasize the constraints of the design space.

Contextual Notes

Participants highlight the need for specific details regarding the design parameters, which may influence the fluid dynamics outcomes. The discussion reflects uncertainty regarding the impact of different bend configurations on airflow.

Who May Find This Useful

Individuals involved in automotive engineering, specifically those working on turbocharger systems or fluid dynamics in mechanical design, may find this discussion relevant.

danoonez
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It's not so simple to me being that I have no background in fluid dynamics, but it seems like it would be fairly simple for most mechanical engineers; anyway:

This is to help me with the design of my charge pipes in my custom turbocharger setup. Assuming a constant radius throughout, which would be more restrictive to the compressed air?

1) One 90 degree bend followed by a straight pipe followed by one more 90 degree bend.

2) One 90 degree bend followed by a straight pipe followed by a 45 degree bend followed by more straight pipe and followed by one more 45 degree bend.

3) One 135 degree bend followed by a straight pipe followed by one 45 degree bend.

Thanks for anybody's input.
 
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It's not a simple problem.

Is the total turn 180 degrees, or are you merely shifting the flow over a bit (doing a +90 followed by a -90 e.g.)?

What diameter pipe? What pressure, temperature, etc.? How long is the straight pipe?
 
Hmm, I guess it's not as simple as I imagined.

The details you asked for:

It will be a full 180 degree turn

2.5" diameter pipe, approximately 70 degrees F., approximately 8 lb/in^2, the straight pipes inbetween the bends would be about 6" max.
 
The best possible choice would definitely be a U-shaped pipe.
Neither of the ones u mentioned cos u want to change its direction by a full 180 degrees.
 
naveen said:
The best possible choice would definitely be a U-shaped pipe.
Neither of the ones u mentioned cos u want to change its direction by a full 180 degrees.

Unfortunately, a full 180 degree bend is not possible b/c of space constraints.
 
In that case, you will want the turns to be as smooth as possible.

Keep all hard edges out of it if at all possible.
 
enigma said:
In that case, you will want the turns to be as smooth as possible.

Keep all hard edges out of it if at all possible.


They will all be mandrel bends.
 

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