Abstract
The effect of compressor fouling on the performance of a gas turbine has been the subject of several papers; however, the goal of this paper is to address a more fundamental question of the effect of fouling, which is the onset of unstable operation of the compressor. Compressor fouling experiments have been carried out on a test rig refitted with TJ100 small jet engine with centrifugal compressor. Fouling on the compressor blade was simulated with texturized paint with average roughness value of 6 μm. Compressor characteristic was measured for both the clean (baseline) and fouled compressor blades at several rotational speeds by throttling the engine with variable exhaust nozzle. A Greitzer-type compression system model has been applied based on the geometric and performance parameters of the TJ100 small jet engine test rig. Frequency of plenum pressure fluctuation, the mean disturbance flow coefficient, and pressure-rise coefficient at the onset of plenum flow field disturbance predicted by the model was compared with the measurement for both the baseline and fouled engine. Model prediction of the flow field parameters at inception of unstable operation in the compressor showed good agreement with the experimental data. The results proved that used simple Greitzer model is suitable for prediction of the engine compressor unstable behavior and prediction of the mild surge inception point for both the clean and the fouled compressor.
Highlights
Compressor fouling is the deposition of airborne contaminates such as fly ash, airborne salt, hydrocarbon, dust, lube oil, etc. on the surfaces of the compressor blades, stators and annulus walls [1,2,3]
The detrimental effect of compressor fouling on the overall performance of a gas turbine can be controlled through effective inlet air filtration systems combined with a suitable mix of online and offline compressor washing
Previous works on the effect of fouling on gas turbine compressor dynamics has been on estimating its effect on engine performance in terms of reduction in power output and thermal efficiency
Summary
Compressor fouling is the deposition of airborne contaminates such as fly ash, airborne salt, hydrocarbon, dust, lube oil, etc. on the surfaces of the compressor blades, stators and annulus walls [1,2,3]. Doi:10.1115/1.4037913 Copyright (c) 2017 bJoyuArnSaMl oEf Engineering for Gas Turbines and Power throttled until unstable compressor operation, which was estimated based on the air mass flow rate oscillations displayed to the test operator and based on the engine audible noise. Mean (time averaged) flow coefficient, mean pressure-rise coefficient and frequency of plenum pressure oscillations at the mild surge points were subsequently compared with the model for both the clean and fouled compressor configuration. Mean (time averaged) flow coefficient, mean pressure-rise coefficient and frequency of plenum pressure oscillations at the mild surge points were subsequently compared with the model for both the clean and fouled compressor configuration. 3.0 TESTING AND MEASUREMENTS
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
