Calculating Annulus Area in a Compressor

In summary, the annulus area in a compressor is the flow area between the rotor and compressor case, formed by two concentric circles. It is not a general term and is specifically used in gas turbine engines, as discussed in the NACA TN 4130 report by George C. Ashby, Jr, John R. Erwin, and Wallace M. Schulze. The report also discusses the impact of varying annulus-area ratio, solidity, blade angle, and Reynolds number on compressor rotor performance.
  • #1
sid_galt
502
1
What is annulus area in a compressor?
 
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  • #2
It's not a general term as far as I know, but it can be the area between cylinder and the piston.
 
  • #3
Sorry for being not clear. I was talking about the annulus area of a compressor in a gas turbine engine, not a reciprocating one.
 
  • #5
It's the flow area in the compressor. It's an annulus because it is formed by two concentric circles i.e. the rotor and the compressor case.
 
  • #6
Thanks for the help
 

1. How do you calculate the annulus area in a compressor?

The annulus area in a compressor can be calculated by multiplying the average circumference of the compressor rotor by the height of the annulus. This measurement is important for determining the airflow and efficiency of the compressor.

2. What is the purpose of calculating the annulus area in a compressor?

The annulus area is an important measurement in compressor design as it affects the overall performance and efficiency of the compressor. It also helps in determining the appropriate size and shape of the compressor blades.

3. How does the shape of the compressor affect the annulus area?

The shape of the compressor can greatly affect the annulus area. A larger annulus area can lead to higher efficiency, while a smaller annulus area can result in lower efficiency. The shape of the compressor also determines the air flow and pressure within the compressor.

4. Are there any factors that can affect the accuracy of calculating the annulus area?

Yes, there are several factors that can affect the accuracy of calculating the annulus area. These include variations in the compressor rotor circumference, blade thickness, and wear and tear of the compressor components. It is important to take these factors into consideration when calculating the annulus area.

5. Can the annulus area be adjusted in a compressor?

Yes, the annulus area can be adjusted in a compressor by changing the size or shape of the compressor blades. This can be done to optimize the airflow and efficiency of the compressor for different operating conditions.

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