| Siren(旋笛式)激励系统的气动声学特性 |
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| 引用本文： | 丁志磊,林宇震,秦皓,汤冠琼.Siren(旋笛式)激励系统的气动声学特性[J].航空动力学报,2015,30(7):1599-1604. |
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| 作者姓名： | 丁志磊 林宇震 秦皓 汤冠琼 |
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| 作者单位： | 北京航空航天大学 能源与动力工程学院 航空发动机气动热力国家级重点实验室, 北京 100191,北京航空航天大学 能源与动力工程学院 航空发动机气动热力国家级重点实验室, 北京 100191,北京航空航天大学 能源与动力工程学院 航空发动机气动热力国家级重点实验室, 北京 100191,北京航空航天大学 能源与动力工程学院 航空发动机气动热力国家级重点实验室, 北京 100191 |
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| 摘 要： | 基于siren(旋笛式)激励系统,理论推导了旋笛产生的非定常脉动速度和双传声器法获得的声质点振动速度之间的能量转换关系,并通过系统的气动声学特性实验考察了激励强度、频率、马赫数以及传感器间距对声质点振动速度的影响,验证了理论模型.结果表明:由旋笛产生的非定常脉动速度并不完全转换为声质点振动速度,这种转换关系主要与马赫数有关.且当流体为不可压缩气体,即马赫数小于0.3时,能量转换因子与马赫数的平方成正比,马赫数越大,能量转换因子越大,非定常流动转换为声能的效率越高.
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| 关 键 词： | 旋笛式激励系统 气动声学特性 双传声器法 能量转换因子 燃烧不稳定性 |
| 收稿时间： | 2014/2/19 0:00:00 |
Aeroacoustic characteristic of siren incentive system |
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| DING Zhi-lei,LIN Yu-zhen,QIN Hao and TANG Guan-qiong.Aeroacoustic characteristic of siren incentive system[J].Journal of Aerospace Power,2015,30(7):1599-1604. |
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| Authors: | DING Zhi-lei LIN Yu-zhen QIN Hao and TANG Guan-qiong |
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| Institution: | National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics of Astronautics, Beijing 100191, China,National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics of Astronautics, Beijing 100191, China,National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics of Astronautics, Beijing 100191, China and National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics of Astronautics, Beijing 100191, China |
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| Abstract: | Based on siren incentive system, the energy transform relationship between unsteady flow fluctuation velocity brought by siren actuator and acoustic particle velocity got by the two-microphone technique was derived. And the effect of incentive intensity, frequency, Mach number and the sensor spacing on the acoustic particle velocity was studied through the aeroacoustic characteristic experiment, verifying the theoretical model. The results are as follows: acoustic particle velocity can't be fully converted by unsteady flow fluctuation velocity, the transform relationship between velocities mentioned above is related to Mach number. Under incompressible condition, Mach number less than 0.3, the energy transform factor is proportional to the square of Mach number, and the larger Mach number means, the larger energy transform factor, and the higher conversion efficiency of unsteady flow to acoustic energy. |
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| Keywords: | siren incentive system aeroacoustic characteristic two-microphone technique energy transform factor combustion instability |
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