火花型激励合成射流瞬时流场测试

吕元伟; 单勇; 张靖周; 谭晓茗

doi:10.13224/j.cnki.jasp.2017.10.009

火花型激励合成射流瞬时流场测试

doi: 10.13224/j.cnki.jasp.2017.10.009

1.
南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室,南京 210016
2.
南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室,南京 210016；先进航空发动机创新协同中心，北京 100191

基金项目: 国家自然科学基金（51306088）

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出版历程
- 收稿日期: 2016-03-11
- 刊出日期: 2017-10-28

Measurement on instantaneous flow fields of a sparkexcited synthetic jet

摘要

摘要: 采用粒子图像测速仪(PIV)相位锁定采样方法对一个特定结构的火花型合成射流的非定常流场进行了实验测量，得到了火花型合成射流形成的涡对在外场的发展过程；同时采用热线风速仪对喷孔下游固定位置的瞬时速度进行了测试，对火花型合成射流激励参数(放电器储能、激励频率)的影响进行了初步的对比分析。结果表明：合成射流在孔口喷射初期呈现球面扩散状，在发展过程中不断剪切和卷吸外部气流，形成一系列旋向相反的涡串；合成射流的最大瞬时峰值法向速度出现在放电后大约005T时刻，随后其作用范围迅速扩大，瞬时峰值速度和涡量逐渐降低。在该激励器结构参数和激励参数范围内，合成射流随激励频率和放电器储能的增大而有所增加。
- 合成射流 /
- 火花型激励器 /
- 瞬时流场 /
- 粒子图像测速仪(PIV) /
- 热线风速仪
Abstract: Phaseresolved instantaneous flow fields were experimentally measured by using particle image velocimetry (PIV) for the synthetic jets, which were excited by a specific sparkdischarge actuator. The unsteady flow structures of the sparkexcited synthetic jet during the developing process were captured. Meanwhile, the instantaneous velocities of the sparkexcited synthetic jet at some fixed axial positions downstream the nozzle were measured by using the hotwire anemometer. The effects of the spark-excitation parameters (such as discharge frequency and capacitance energy storage) on the synthetic jet were preliminarily analyzed. It was revealed that the sparkexcited synthetic jet took on sphericalshape diffusion near the jet nozzle at the initial stage of synthetic jet formation. As the synthetic jet developed, a series of vortices were induced by the shear and entrainment actions of the synthetic jet. The maximum peak normalvelocity appeared about 005T after pulsed discharge. From this moment the synthetic jet diffused rapidly, resulting in the decrease of peak velocity and vorticity. For the present sparkexcited actuator and the excitation parameters, the sparkexcited synthetic jet was strengthened with the increase of excitation frequency and capacitance energy storage.
- synthetic jet /
- sparkexcited actuator /
- instantaneous flow field /
- particle image velocimetry(PIV) /
- hotwire anemometer

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