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Численное моделирование акустических резонансных явлений в каналах перепуска воздуха авиационного двигателя

Численное моделирование акустических резонансных явлений в каналах перепуска воздуха авиационного двигателя

Abstract

Проведено численное моделирование собственных резонансных частот канала перепуска воздуха авиационного двухконтурного двигателя. Получены результаты численных расчетов собственных частот полости перепуска в ANSYS CFX. В расчетах для возбуждения полости канала перепуска на входной границе задавался широкополосный шум (120 дБ), фильтрованный в диапазоне частот от 200 до 1000 Гц, и поток со скоростью 60 м/с, что приводит к проявлению резонанса на собственной частоте полости. В расчете вдоль всей проточной части были установлены микрофоны, в которых записывалось статическое давление. На основании полученных сигналов было сделано Фурье-преобразование и построены спектры. Анализируя полученные спектры при различных граничных условиях по температуре, сделали вывод, что расчеты в ANSYS CFX позволяют получить физически правильные результаты. В работе представлены результаты расчетов мероприятий для изменения собственной частоты канала перепуска за компрессором низкого давления (КНД). Мероприятия, главным образом, сводятся к изменению объема полости. Было предложено сделать четыре отверстия, соединяющих канал перепуска с проточной частью КНД. В статье дана оценка эффективности данного мероприятия. Результаты численных расчетов в ANSYS CFX собственной частоты хорошо согласуются с аналитическими и экспериментальными данными.

In present paper the numerical simulation of the resonance eigen frequencies of the double-flow aircraft engine bleed valve was conducted. The simulation was performed with ANSYS CFX commercial solver. The broadband excitation in frequency range of 200-1000 Hz and of 120 dB level was added to the main flow of 60 m/s at the inlet in the simulation. Such an excitation brings the resonance at the eigen frequencies of the valve. Several monitor points for static pressure were located inside the computational domain and the Fourier transform was applied to the obtained monitor signals. The spectral analysis has shown that ANSYS CFX allows obtaining correct physical results. Several treatments were proposed for the change of the valve eigen frequency which are mainly connected with the change of the valve volume. It was proposed to drill 4 holes which connect the bleed valve with the low pressure compressor duct. This treatment was assessed in a current work as well. Numerical results for the eigen frequency obtained with ANSYS CFX was in a good agreement with the analytical and the experimental data.

Keywords

КАНАЛЫ ПЕРЕПУСКА,РЕЗОНАНСНЫЕ ЯВЛЕНИЯ В КАНАЛАХ АВИАЦИОННОГО ДВУХКОНТУРНОГО ДВИГАТЕЛЯ,AIRCRAFT ENGINE RESONANCE PHENOMENON,СОБСТВЕННАЯ ЧАСТОТА,EIGEN FREQUENCY,АВИАЦИОННЫЙ ДВИГАТЕЛЬ,AIRCRAFT ENGINE,КОМПРЕССОР НИЗКОГО ДАВЛЕНИЯ,LOW-PRESSURE COMPRESSOR,КОМПРЕССОР ВЫСОКОГО ДАВЛЕНИЯ,HIGH-PRESSURE COMPRESSOR,УРАВНЕНИЯ НАВЬЕ СТОКСА,NAVIER-STOKES EQUATIONS,ПРЕОБРАЗОВАНИЕ ФУРЬЕ,FOURIER TRANSFORM,BLEED VALVE

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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