激励器结构对三电极等离子体高能合成射流流场及其冲量特性的影响

发布时间：2018-10-30 14:49

【摘要】：等离子体激励器以其结构简单、响应速度快、环境适应性强等优势,已成为主动流动控制技术和流体力学研究的前沿与热点。相比于传统两电极激励器,三电极等离子体高能合成射流激励器具有更高的能量效率,形成射流冲量更大,有望成为新型快响应直接力产生装置。为揭示激励器结构对射流流场和冲量特性的影响规律,进而优化激励器结构参数,利用电参数测量装置、高速阴影系统及自主设计的单丝扭摆式微冲量测量系统对不同射流孔径、腔体体积和电极间距的三电极激励器放电特性、射流流场及其冲量进行了实验研究。为对比激励器在不同工况条件下的工作特性,定义无量纲能量沉积ε和无量纲射流冲量I*,并分析了激励器结构参数对ε和I*的影响。结果表明对于给定无量纲能量沉积ε,激励器存在最优射流孔径;激励器无量纲能量沉积ε和无量纲射流冲量I*随腔体体积增加而减小,随激励器电极间距增加而增加;射流强度及其流场影响区域随腔体体积增加而减小,随激励器电极间距增加而增加。对比不同腔体体积和电极间距工况条件下I*随ε的变化可知,为设计具有较好射流冲量水平的激励器,在相同无量纲能量沉积ε条件下,应尽量增大激励器无量纲射流冲量I*。当设计激励器无量纲能量沉积ε小于初始工况时,应增大初始工况激励器腔体体积使无量纲能量沉积ε降低至设计值;当设计激励器无量纲能量沉积ε大于初始工况时,应增大初始工况激励器电极间距使无量纲能量沉积ε增加至设计值,使设计激励器具有较好的射流冲量水平。
[Abstract]:Because of its simple structure, fast response speed and strong environmental adaptability, plasma exciter has become the frontier and hotspot of active flow control technology and hydrodynamics. Compared with the conventional two-electrode actuator, the three-electrode plasma high-energy synthetic jet actuator has higher energy efficiency and larger impulse to form the jet, which is expected to be a new type of rapid response direct force generator. In order to reveal the influence of actuator structure on jet flow field and impulse characteristics, and then optimize the structure parameters of the actuator, an electric parameter measuring device is used. The discharge characteristics, jet flow field and impulse of three electrode exciters with different jet aperture, cavity volume and electrode spacing are studied experimentally by high-speed shadow system and self-designed single-wire torsion pendulum micro-impulse measurement system. In order to compare the working characteristics of the actuator under different operating conditions, the dimensionless energy deposition 蔚 and the dimensionless jet impulse I _ (1) are defined, and the influence of the actuator's structural parameters on 蔚 and I * is analyzed. The results show that for a given dimensionless energy deposition 蔚, the actuator has an optimal jet aperture, and the dimensionless energy deposition 蔚 and the dimensionless jet impulse I * decrease with the increase of cavity volume and increase with the increase of electrode spacing. The jet strength and its flow field decrease with the increase of cavity volume and increase with the increase of electrode spacing. By comparing the changes of I * with 蔚 under different conditions of cavity volume and electrode spacing, it can be seen that in order to design an exciter with good jet impulse level, under the same dimensionless energy deposition 蔚 condition, The impulsion of dimensionless jet should be increased as much as possible. When the dimensionless energy deposition 蔚 of the designed actuator is smaller than that of the initial working condition, the volume of the cavity should be increased to reduce the dimensionless energy deposition 蔚 to the design value. When the dimensionless energy deposition 蔚 of the design exciter is larger than that of the initial working condition, the electrode spacing should be increased to increase the dimensionless energy deposition 蔚 to the design value, so that the designed exciter has a better jet impulse level.
【作者单位】：国防科学技术大学航天科学与工程学院;中国国防科技信息中心;
【基金】：国家自然科学基金(11372349) 全国优秀博士论文作者专项资金(201058) 国防科技大学杰出青年基金(CJ110101)
【分类号】：O358

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