A useful similarity principle for jet engine exhaust system performance

1988 ◽  
Author(s):  
W. PRESZ, JR. ◽  
E. GREITZER
Keyword(s):  
System Performance ◽  
Exhaust System ◽  
Engine Exhaust ◽  
Jet Engine ◽  
Similarity Principle

1/4 Scale Hot Flow Model Test of a GE LM2500 Exhaust System

1992 ◽  
Author(s):  
D. Vandam ◽  
A. M. Birk
Keyword(s):  
System Performance ◽  
Flow Model ◽  
Static Pressure ◽  
Exhaust System ◽  
Engine Exhaust ◽  
Static Pressure Distribution ◽  
Sample Data ◽  
Infrared Signature ◽  
Mass Flow Rates ◽  
Cooling Air

A facility has been constructed to test exhaust systems for the GE LM2500 Gas Turbine. The facility is capable of simulating the hot flow exhaust conditions for the LM2500 in 1/4 scale. The facility was constructed to study LM2500 exhaust system performance including the effects of small changes in the geometry of the LM2500 exhaust collector and also to study the effects of devices such as infrared signature suppressors on the overall exhaust system performance. The facility is currently instrumented to measure local static and total pressures, local swirl angles, exit plane total and static pressure distribution, and primary (engine exhaust) and secondary (enclosure cooling air) mass flow rates. The facility has been constructed to accommodate a variety of exhaust uptake geometries. Tests were recently conducted to study certain aspects of exhaust system performance. Sample data is presented and comparisons are made with other available data.

scholarly journals Analysis of Engine Exhaust Pressure Wave Performance

2017 ◽  
Vol 1 (1) ◽  
pp. 10
Author(s):  
Yang Wu ◽  
He Ma
Keyword(s):  
Pressure Wave ◽  
Working Condition ◽  
Exhaust System ◽  
Propagation Process ◽  
Engine Exhaust ◽  
Work Cycle ◽  
Negative Effect ◽  
Harmonic Components ◽  
Exhaust Pressure Wave ◽  
Four Cylinders

By analyzing the form of pressure wave within automotive exhaust system and relationship between propagation process and working condition of engine, simulate a work cycle for purpose of timely diagnosing troubles, thus presenting exhaust stroke of four cylinders through pressure wave; modifying of the speed of engine will affect the amplitude of pressure wave, harmonic components, phase position and other parameters; at the end of the exhaust stroke, exhaust pressure wave generates interference, superposition and negative effect, which is of great importance for analysis and diagnosis of engine troubles by using exhaust pressure wave.

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