Flameholder Combustion Instability Study

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Abstract:

A model has been developed which predicts the efficiency and low frequency response of a turbofan augmentor with conventional flameholders. The model evaluates the stability characteristics of the flameholders at low inlet temperature a with model for two-phase fuel flames. The driving potential for flow frequency instability is identified with excessive flameholder wake fuel- air ratio. The model is compared to engine experience, available literature and other models with favorable results. The relative stability characteristics of two forced mixing augmentor concepts were examined and the reduction in the dependence of overall efficiency on fuel-air ratio was found to be stabilizing. Recommendations for flameholder design procedures are presented. Author

Author(s):
Ernst, R. C.
Author Organization(s):
PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
Descriptive Note:
Final rept. 1 Mar 1976-30 Sep 1977
Pagination:
0167

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PWA-FR-9163, AFAPL-TR-78-24
Contract/Grant Number(s):
F33615-76-C-2023
Task Number(s):
05
Project Number(s):
3066
Monitor Series:
TR-78-24, AFAPL
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.3.1_Analyze Problem; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_4.6_Engineering; JCA_4.6.1_General Engineering; JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_1.2.6_Concepts; JCA_5.5.2_Task; JCA_5.5_Direct; JCA_1.2.5_Lessons Learned; JCA_1.4.2_Health Service Delivery; JCA_1.4_Force Support; JCA_4.3_Maintain; JCA_JCA_4.1.2_Sustain the Force; JCA_4.1_Deployment and Distribution; JCA_6_Net Centric
Modernization Areas:
Microelectronics
Communities of Interest:
Weapons Technologies
Descriptor(s):
*TURBOFAN ENGINES, *COMBUSTION STABILITY, *FLAME HOLDERS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, AUGMENTATION, WAKE, FUEL AIR RATIO, TEST FACILITIES, LOW FREQUENCY, AFTERBURNERS
Field(s)/Group(s):
Combustion and Ignition, Jet and Gas Turbine Engines
Keyword(s):
PE62203F, WUAFAPL30660535
Report Date:
1978 May 01