Numerical Investigation of the Influence of the Input Air Irregularity on the Performance of Turbofan Jet Engine

The article describes the numerical investigation of the input air irregularity influence of turbofan engine on its characteristics. The investigated fan has a wide-blade, an inlet diameter about 2 meters, a pressure ratio about 1.6 and the bypass ratio about 4.8. The flow irregularity was simulated...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-01, Vol.302 (1), p.12028
Main Authors: Novikova, Y, Zubanov, V
Format: Article
Language:English
Subjects:
Air flow
Bypass ratio
Computational efficiency
Computing time
Efficiency
Fourier analysis
Harmonic analysis
Irregularities
Jet engines
Mass flow
Mathematical analysis
Numerical analysis
Pressure ratio
Turbofan engines
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Summary:The article describes the numerical investigation of the input air irregularity influence of turbofan engine on its characteristics. The investigated fan has a wide-blade, an inlet diameter about 2 meters, a pressure ratio about 1.6 and the bypass ratio about 4.8. The flow irregularity was simulated by the flap input in the fan inlet channel. Input of flap was carried out by an amount of 10 to 22,5% of the input channel diameter with increments of 2,5%. A nonlinear harmonic analysis (NLH-analysis) of NUMECA Fine/Turbo software was used to study the flow irregularity. The behavior of the calculated LPC characteristics repeats the experiment behavior, but there is a quantitative difference: the calculated efficiency and pressure ratio of booster consistent with the experimental data within 3% and 2% respectively, the calculated efficiency and pressure ratio of fan duct - within 4% and 2.5% respectively. An increasing the level of air irregularity in the input stage of the fan reduces the calculated mass flow, maximum pressure ratio and efficiency. With the value of flap input 12.5%, reducing the maximum air flow is 1.44%, lowering the maximum pressure ratio is 2.6%, efficiency decreasing is 3.1%.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/302/1/012028