Accession Number:

ADA021626

Title:

Mixing Duct Pressure Distributions and Exhaust Flow Characteristics of a High Temperature and Pressure Cylindrical Ejector.

Descriptive Note:

Interim technical rept. Jun 73-May 74,

Corporate Author:

AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

• Quinn,Brian
• Toms,Howard L.

Report Date:

1975-06-01

Pagination or Media Count:

95.0

Abstract:

The thermodynamic and mixing characteristics of a family of inlet area ratio 26 ejectors have been measured across a range of primary reservoir pressures 0 to 80 psig and temperatures 65 to 1000 degrees F. The length-to-duct diameter ratio of the ejectors was the family parameter and varied from 12.36 to 3.46. The distribution of pressure along the wall of the mixing duct clearly identified up to three distinct modes of turbulent mixing. They also substantiated prior observations that mixing is accelerated by heating the primary jet. The discrete modes of mixing were subjectively related to the acoustic properties of the greatly underexpanded primary nozzle.

Descriptors:

• *SHORT TAKEOFF AIRCRAFT
• *THRUST AUGMENTOR NOZZLES
• *EJECTORS
• THERMODYNAMICS
• TURBULENT FLOW
• PRESSURE DISTRIBUTION
• LIFT TO DRAG RATIO
• THRUST AUGMENTATION

Subject Categories:

• Aerodynamics
• VSTOL

Distribution Statement:

APPROVED FOR PUBLIC RELEASE