共振式合成射流气体压电泵仿真分析与实验研究

发布时间：2018-06-26 22:13

本文选题：共振 + 合成射流　；参考：《吉林大学》2017年硕士论文

【摘要】：合成射流气体压电泵作为一种新型微小气体压电泵,利用合成射流原理形成气体的泵送,广泛应用于主动散热、气体供应及动力驱动等场合,具有微型化、结构简单、寿命长、效率高且便于数字化控制的特点,可广泛应用到LED、通信设备、汽车电子、计算机、太阳能及家用电器等产品中器件的散热。本文结合国家自然科学基金项目《压电驱动流体动耦合软体驱动器设计理论与关键技术研究》(项目编号:51405189)展开研究,提出一种共振式合成射流气体压电泵。该压电泵应用合成射流原理,将压电振子的振动与开有射流孔薄片结构的振动相结合,使整个系统产生共振,形成对气体的推送,具有体积小、流量大的优点。共振式合成射流气体压电泵主要有单振子和双振子两种结构,单振子结构只需要一个振子驱动,能耗低、结构简单;双振子结构利用两个振子驱动,开有射流孔的振子振动可控,输出能力强,流量更大。本文的具体研究内容如下:共振式合成射流气体压电泵的结构中,普通圆形单晶片压电振子和中心带孔的圆形单晶片压电振子是核心驱动部件,由ANSYS进行这两种振子的模态和静力学仿真可以指导实验中工作频率范围的选择。经过比较,选取普通压电振子的一阶振型,其固有频率为4281.9Hz;中心带孔压电振子同样选取一阶振型,其固有频率为3992.7Hz。最后对两种振子进行不同频率下振幅测量,测量结果作为双振子结构流固耦合仿真中激励施加的依据。单振子共振式合成射流气体压电泵采用一个振子进行驱动,铜片受迫振动。对单振子结构进行实验研究,得出四个参数:空腔高0.8mm,泵腔高0.3mm,射流孔直径0.7mm,出气孔直径1.0mm时,频率3.9KHz,流量达到1226ml/min。对单振子结构进行铜片和振子位移的测量,得出铜片和振子的位移曲线均为正弦且两者具有一定的相位差。使用多物理场仿真软件进行双振子共振式合成射流气体压电泵的仿真分析,应用流固耦合接口,对空气流场、空气流速和出气孔流量进行分析,得到空气的具体运动情况。在共振频率附近,对空腔高、泵腔高、射流孔直径和出气孔直径四个参数进行参数化分析,得出空腔高和射流孔直径对流量的影响较大。对双振子共振式合成射流气体压电泵进行实验分析,主要研究参数对流量影响和振子位移测量。研究四个参数对流量的影响,当空腔高为0.6mm,泵腔高为0.3mm,射流孔直径为0.8mm,出气孔直径为1.0mm,在频率3.9KHz下流量可以达到1511ml/min,对比单振子结构流量提高了23%。测量双振子结构中两个振子的位移,位移曲线表明两个振子在相同激励下没有相位差。对比单振子结构中铜片和振子的位移曲线,双振子结构中的中心带孔振子振幅较小,但双振子结构的流量却增大,说明消除相位差可以提高流量。
[Abstract]:As a new type of micro gas piezoelectric pump, synthetic jet pump is widely used in active heat dissipation, gas supply and power drive. It has the advantages of miniaturization, simple structure and long life. Because of its high efficiency and convenient digital control, it can be widely used in LED, communication equipment, automobile electronics, computer, solar energy and household appliances. In this paper, a resonant synthetic jet gas piezoelectric pump is proposed, which is based on the National Natural Science Foundation of China, "Research on the Design Theory and key Technology of piezoelectric hydrodynamic Coupling soft driver" (item No.: 51405189). The piezoelectric pump applies the principle of synthetic jet to combine the vibration of piezoelectric vibrator with the vibration of thin slice structure with a jet hole, which makes the whole system produce resonance and form the push of gas, which has the advantages of small volume and large flow rate. The resonant synthetic jet gas piezoelectric pump has two kinds of structures: single oscillator and double oscillator. The single oscillator structure needs only one oscillator to drive, the energy consumption is low, the structure is simple, and the dual oscillator structure is driven by two oscillators. The vibration of the vibrator with a jet hole is controllable, the output capacity is strong, and the flow rate is larger. The main contents of this paper are as follows: in the structure of the resonant synthetic jet gas piezoelectric pump, the common circular single crystal wafer piezoelectric oscillator and the central circular single crystal slice piezoelectric oscillator are the core driving components. The modal and static simulation of the two oscillators by ANSYS can guide the selection of operating frequency range in the experiment. Through comparison, the first order mode of ordinary piezoelectric oscillator is selected, its natural frequency is 4281.9 Hz, and the first order mode with central hole is also selected, its natural frequency is 3992.7Hz. Finally, the amplitude of the two oscillators is measured at different frequencies, and the measured results are used as the basis for the excitation in the fluid-solid coupling simulation of the two-oscillator structure. Single oscillator resonant synthetic jet gas piezoelectric pump is driven by a vibrator and the copper sheet is forced to vibrate. Four parameters are obtained: the cavity height is 0.8mm, the pump cavity height is 0.3mm, the jet hole diameter is 0.7mm, and the frequency is 3.9kHz when the air hole diameter is 1.0mm, and the flow rate is 1226ml / min. The displacement curves of copper plates and oscillators are sinusoidal and there is a certain phase difference between them. The multi-physical field simulation software is used to simulate and analyze the two-vibrator resonant jet gas piezoelectric pump. By using the fluid-solid coupling interface, the air flow field, air velocity and outlet flow rate are analyzed, and the specific movement of the air is obtained. In the vicinity of resonance frequency, the parameters of cavity height, pump cavity height, jet hole diameter and orifice diameter are analyzed. It is concluded that the influence of cavity height and jet hole diameter on the flow rate is greater. In this paper, the experimental analysis of the dual oscillator resonant synthetic jet gas piezoelectric pump is carried out. The influence of the parameters on the flow rate and the measurement of the displacement of the vibrator are studied. The influence of four parameters on the flow rate is studied. The cavity height is 0.6 mm, the pump cavity height is 0.3 mm, the diameter of the jet hole is 0.8 mm, the diameter of the outlet hole is 1.0 mm, and the flow rate can reach 1511ml / min at the frequency of 3.9 kHz. The displacement of two oscillators in a double oscillator structure is measured. The displacement curve shows that there is no phase difference between the two oscillators under the same excitation. Compared with the displacement curves of copper plates and oscillators in a single oscillator structure, the amplitude of the center hole oscillator in the double oscillator structure is smaller, but the flow rate of the double oscillator structure increases, which indicates that eliminating the phase difference can increase the flow rate.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH38

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