Siren(旋笛式)激励系统的气动声学特性

丁志磊; 林宇震; 秦皓; 汤冠琼

doi:10.13224/j.cnki.jasp.2015.07.009

Siren(旋笛式)激励系统的气动声学特性

doi: 10.13224/j.cnki.jasp.2015.07.009

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

详细信息

作者简介:
丁志磊(1989-),男,云南姚安人,硕士生,主要从事民用航空发动机燃烧不稳定性研究.

中图分类号: V231.2
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- 被引次数: 0
出版历程
- 收稿日期: 2014-02-19
- 刊出日期: 2015-07-28

Aeroacoustic characteristic of siren incentive system

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

摘要

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.
- 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
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.
- siren incentive system /
- aeroacoustic characteristic /
- two-microphone technique /
- energy transform factor /
- combustion instability

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