Performance Analysis And Research On Trend Prediction Of Module

The air-craft engine is a kind of multi-unit system which is highly complex and repairable. As the heart of the aircraft, the air-craft engine is the focus of the aviation maintenance. It could reduce maintenance costs to study the laws of the engine performance decline, to accurately identify potential failure of the engine, to well formulate maintenance strategies. That could be significant to the state of the engine system which is a very complex nonlinear dynamic system and the long-term forecast of the aircraft engine performance.Due to the limited internal monitoring conditions, the traditional type of engine only could arrange a few of the temperature and pressure sensors, thus the engine module condition could not be monitored and studied. Thanks to the advance of the technology, new engines add a large number of sensors inside, and that makes the study on performance parameters of the module become feasible.On the basis of summarizing the related literature at home and abroad, the mechanism of the module decline and the method of using of gas path parameter to evaluate the performance of the module body are summarized. Then a performance evaluation method of the degradation model is put forward. The method which has a quantitative analysis of the compressor performance recession will be able to ensure the security of the aircraft engine running and timely renewal; Proposed gas line compressor performance degradation model performance evaluation method, a typical recession and fouling mechanism blade tip clearance increases and other long-running compressor due for introduction of the recession factor built from the perspective of the principle of compressor blade fouling and different speeds compressor performance degradation quantitative analysis model of tip clearance increases, the results show that the performance impact is greater than the combined effect of fouling and blade tip clearance increases the impact acting alone, but less alone and efficiency affect the impact is greater than the compression ratio on; fractal theory is introduced aeroengine condition monitoring. Compressor establish correlation dimension model to calculate a compressor blade tip clearance fouling and increase efficiency dimension and dimension under the influence of pressure ratio, and performance degradation with the compressor gas path model comparative analysis shows that the correlation dimension consistent model and pneumatic performance degradation model results; the establishment of De Wijs compressor fractal model, performance degradation regularity of use De Wijs compressor fractal model compressor, the results showed high and low pressure compressor efficiency decline law can respectively fractal dimension of 0.761 and 0.469 of the De Wijs fractal curve approximation.