Preliminary Dynamic Tests of a Flight-Type Ejector

TITLE AND SUBTITLE:
Preliminary Dynamic Tests of a Flight-Type Ejector

AUTHOR(S):
Colin K. Drummond

REPORT DATE:
July 1992

FUNDING NUMBERS:
WU-505-62-30

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-7245

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, D.C. 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-105814

SUPPLEMENTARY NOTES:
Prepared for the 28th Joint Propulsion Conference cosponsored by the AIAA, SAE, ASME, and ASEE, Nashville, Tennessee, July 6-9, 1992. Responsible person, Colin K. Drummond, (216) 433-3956.

ABSTRACT:
A thrust augmenting ejector was tested to provide experimental data to assist in the assessment of theoretical models to predict duct and ejector fluid-dynamic characteristics. Eleven full-scale thrust augmenting ejector tests were conducted in which a rapid increase in the ejector nozzle pressure ratio was effected through a unique facility bypass/burst-disk subsystem. The present work examines two cases representatives of the test performance window. In the first case, the primary nozzle pressure ratio (NPR) increased 36% from one unchoked (NPR=1.29) primary flow condition to another (NPR=1.75) over a 0.15 second interval. The second case involves choked primary flow conditions, where a 17% increase in primary nozzle flowrate (from NPR=2.35 to NPR=2.77) occurred over approximately 0.1 seconds. Although the real-time signal measurements support qualitative remarks on ejector performance, extracting quantitative ejector dynamic response was impeded by excessive aerodynamic noise and thrust stand dynamic (resonance) characteristics. It does appear, however, that a quasi-steady performance assumption is valid for this model with primary nozzle pressure increased on the order of 50lbf/s. Transient signal treatment of the present dataset is discussed and initial interpretations of the results are compared with theoretical predictions for a similar STOVL ejector model.

SUBJECT TERMS:
Ejector; Dynamic testing; STOVL

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