##  [Actuator Disk Theory](/index.php/actuator-disk-theory) 

  ##  [Actuator Disk Theory](https://engineering.quantumdictionary.io/actuator-disk-theory-0) 

  

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**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A momentum‑based idealization that represents a rotor, propulsor, or turbine as a permeable disk imposing a discontinuous pressure jump (or distributed body force) on the flow; using mass and momentum conservation across control volumes upstream, through, and downstream of the disk yields relationships between induced velocities, thrust and power for steady, incompressible, one‑dimensional axial f