Inlet/ Diffuser - Gas Turbine Engine

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What is the need for inlet in gas turbine engine?
When aircraft move with some speed, the inlet has to covert the speed to pressure. That means energy interchanging. Speed is Kinetic energy. Pressure is potential energy. The inlet not only accompanying in energy interchange, it also guides the airflow to the engine. In subsonic airplanes energy interchange may or mayn’t be.

Define subsonic inlet?
The aircrafts that are operating without exceeding speed of sound is called as subsonic aircrafts. Most of the commercial airplanes are subsonic airplanes. 



You might have seen if you made your fight. This inlet is so simple and straight. The most upstream point of inlet is called lip. Subsonic airplanes will have thick lip.

Define Supersonic inlet?
We know that the main problem in supersonic flow is the formation of shock wave. For supersonic aircrafts shock wave may be advantage or disadvantage, this purely depends on the design. Behind Shock wave there will be dramatic increase in pressure. 



So when we move with supersonic speed, at the inlet, shock wave appears, it slows down the flow to subsonic and increases the pressure. This is how it functions. Supersonic inlets may have a central cone or some shape which is able to control the shock wave formation as like our requirement.

What is pressure recovery of inlet?
Pressure recovery is something associated with inlet performance. It’s the ratio of total pressure at the compressor entry to the free stream total pressure. This factor shows the sole efficiency of inlet. 

Comments

  1. Unknown7 September 2018 at 00:38

    hi.... with due respect I would highlight that in subsonic inlet its shape is divergent instead of straight as u have described. Kindly correct....

    ReplyDelete
  2. Rajveer Singh9 July 2019 at 00:45

    Uselful information shared by you. I am also doing aerospace engineering from aerospace engineering colleges in india.

    ReplyDelete
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