等离子体合成射流的理论模型与重频激励特性
收稿日期: 2014-07-16
修回日期: 2014-10-08
网络出版日期: 2014-11-15
基金资助
国家自然科学基金(51336011, 51207169, 51407197)
Analytical model and repetitive working characteristics of plasma synthetic jet
Received date: 2014-07-16
Revised date: 2014-10-08
Online published: 2014-11-15
Supported by
National Natural Science Foundation of China (51336011, 51207169, 51407197)
等离子体合成射流(PSJ)具有激励强度大、响应速度快等优点,在超声速流动控制领域应用前景广阔。鉴于此,基于传热学和气体动力学的相关理论,建立了考虑喉道内部气流惯性、腔体内外热交换以及吸气恢复阶段的PSJ全周期理论模型,实现了射流速度峰值时刻、吸气过程和振荡过程等关键特性的预测。基于该模型,分析了等离子体合成射流激励器的重复频率工作特点,研究了能量沉积、激励频率和射流孔径对于重频激励特性的影响。重频条件下,激励器存在过渡和稳定两种典型状态。过渡状态下,腔内平均温度不断升高、射流速度峰值逐渐增大。稳定状态下,腔内气体参数呈周期性变化。随着能量沉积和激励频率的增加,激励器腔体内壁温度、射流速度峰值和时均冲力均增加。受腔体材料耐温极限的制约,激励器存在安全工作的参数区间(SOA)。随着孔径的增加,SOA增大,但稳定工作状态下的射流速度峰值和射流持续时间减小。
宗豪华 , 吴云 , 宋慧敏 , 李应红 , 张志波 . 等离子体合成射流的理论模型与重频激励特性[J]. 航空学报, 2015 , 36(6) : 1762 -1774 . DOI: 10.7527/S1000-6893.2014.0297
Plasma synthetic jet (PSJ) actuator has a broad application prospect in supersonic flow control due to its high actuation intensity and rapid response. Based on theories of heat transfer and gas dynamics, an analytical model of the whole working process of PSJ is established. This model takes the inertia of throat gas, heat transfer through the cavity and the refresh stage of actuator into consideration, and can predict the peak jet velocity occurrence time, refresh stage and the oscillation stage. Based on this model, the repetitive working process and characteristics of actuator with different energy deposition, actuation frequencies and orifice diameters, are researched. In the repetitive working process of actuator, there exist two typical working stages, transition stage and steady stage. Both the cavity temperature and peak jet velocity rise at the transition stage while vary periodically at the steady stage. With the energy deposition and actuation frequency increasing, the cavity wall temperature, as well as the peak jet velocity and time-averaged thrust, goes up. Limited by the safety working temperature of cavity material, a safe operation area (SOA) of actuator exists. The area of SOA is proportional to the jet orifice diameter. As the orifice diameter augments, both the peak jet velocity and jet duration time at the steady stage decrease.
Key words： plasma; synthetic jet; actuator; analytical model; flow control
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