20-09-2014, 02:48 PM
ENGINE SURGE DURING REHEAT
ENGAGEMENT -A CASE STUDY
ENGINE SURGE.ppt (Size: 1.34 MB / Downloads: 31)
ABSTRACT
Jaguar is a low altitude fighter and trainer aircraft used by Indian Air Force (IAF), powered by ADOUR MK-811 engine.
The license of engine manufacture are from RR/TM.
The present TBO life for MK-811engine are 1200 hrs of service usage and withdraw for service related defects.
The study of available data reveals that the major defects occurring in these engines are turbine gas temperature, surging, low thrust, reheat snags ,high NH etc..
The most probable cause and maximum number of withdrawals are identified to be due to reheat and surge.
MK-811 engine repair schemes and analysis on components which are related to the reheat snag was analyzed.
Based on the case study ,the various reasons for failure faced by the engines due to REHEAT and remedial measures are taken.
AIM OF THE PROJECT
The main aim is to extract maximum thrust during reheat without any physical damage to the engine components.
Engine components analysis was carried out which are related to the reheat snag.
Study on afterburner.
Components causing surge and possible solutions to avoid surge.
To study the root cause for the engine surge during reheat engagement.
INTRODUCTION
A compressor stall occurs when there is disruption to flow of air in the engine compressor.
A compressor stall occurs when the pressure of air entering the engine drops below the pressure in the compressor.
Then compressed air expands and travels towards the area of less pressure. this happens quit fast and can be explosive.
Engine surge occurs when the compressor completely looses compression and the explosive effect is herd
Surge
Surge is a complete breakdown in compression resulting in a reversal of flow & violent expulsion of previously compressed air out through the engine intake.
In other terms, surging in a gas turbine means that the pressure at the delivery end of the compressor becomes very high as a result of reduced flow at the compressor outlet.
CONCLUSION
Engines are designed to obtain maximum thrust, range endurance and their own operational life.
however without completion of their time between overhaul life engines are being withdrawn from service.
The ADOUR MK 811 engines are assured for 1200 hours of service life, these hours are assured based on their actual service, flying conditions.
Based on case study and analysis on components which are related to reheat snag on Adour MK 811 engines are, unscheduled reheat, nozzle malfunction, fuel leak from RHFCU, surge in PTR reheat, etc,. and the necessary remedial measures to be taken to over come the snags are discussed.