Standard:

• AIR1191

Reaffirmed:

• 1989-05-01

Revised:

• 1971-11-01

Revision:

• Historical. Access the latest revision: AIR1191A

Issuing:

• S-12 Helicopter Powerplant Committee

Scope:

Method: A general method for the preliminary design of a siingle, straight-sided, low subsonic ejector is presented. The method is based on the information presented in References 1, 2, 3, and 4, and utilizes analytical and empirical data for the sizing of the ejector mixing duct diameter and flow length. The low subsonic restriction applies because compressibility effects were not included in the development of the basic design equations. The equations are restricted to applications where Mach numbers within the ejector primary or secondary flow paths are equal to or less than 0.3.Procedure: A recommended step-by-step procedure is shown.Equations: The equations used in the procedure, as well as their derivations, are given.Sample Calculation: A sample calculation is presented to isllustrate the use of the basic method.

History:

Standard	Published	Revision	Status
AIR1191A	1999-03-01	Latest	Revised
AIR1191	1971-11-01	Historical	Reaffirmed

AKA:

• SAE AIR 1191

Sector:

• Aerospace

Topic:

• Engine cooling systems
• Hybrid engines
• Rotary-wing aircraft