| Interaction tonal noise generated by contra-rotating open rotors |
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| 作者姓名： | Wangjian SHU Congcong CHEN Lin DU Xiang HE Xiaofeng SUN |
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| 作者单位： | 1. School of Energy and Power Engineering, Beihang University;2. Research Institute of Aero-Engine, Beihang University;3. AECC Hunan Aviation Powerplant Research Institute |
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| 基金项目： | co-supported by the National Natural Science Foundation of China (Nos. 52022009 and 51790514)；;the National Science and Technology Major Project, China (No. 2017-Ⅱ-003-0015)； |
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| 摘 要： | Fast and accurate prediction of sound radiation of Contra-Rotating Open Rotors(CRORs) is an essential element of design methods of low-noise open rotor propulsion systems.In the present work, a previous frequency-domain model is extended to predict CROR noise. It builds explicitly the relationship between harmonic loadings and corresponding tonal noise, by which the influential parameters to noise generation can be clearly understood. The real distributions of steady and unsteady blade loadings ...
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| 收稿时间： | 14 March 2022 |
Interaction tonal noise generated by contra-rotating open rotors |
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| Wangjian SHU,Congcong CHEN,Lin DU,Xiang HE,Xiaofeng SUN.Interaction tonal noise generated by contra-rotating open rotors[J].Chinese Journal of Aeronautics,2023,36(4):134-147. |
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| Institution: | 1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;2. Research Institute of Aero-Engine, Beihang University, Beijing 100191, China;3. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China |
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| Abstract: | Fast and accurate prediction of sound radiation of Contra-Rotating Open Rotors (CRORs) is an essential element of design methods of low-noise open rotor propulsion systems. In the present work, a previous frequency-domain model is extended to predict CROR noise. It builds explicitly the relationship between harmonic loadings and corresponding tonal noise, by which the influential parameters to noise generation can be clearly understood. The real distributions of steady and unsteady blade loadings are calculated by the Nonlinear Harmonic (NLH) method. In the present hybrid approach, both the CFD and acoustic modules are solved in the frequency domain. To assess the accuracy of the developed method, the loading noise of a CROR is calculated and compared against results by using the time-domain FW-H module of NUMECA. The predicted sound directivities by the two methods are in good agreements. The present acoustic model in the frequency domain is proven to be accurate and have high efficiency in far-field noise prediction and data processing. Furthermore, the characteristics of the CROR interaction tonal noise are analyzed and discussed. |
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| Keywords: | Contra-Rotating Open Rotors (CRORs) Interaction tonal noise Nonlinear Harmonic (NLH) Frequency domain Acoustic analogy |
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