【摘要】：等離子體激勵器以其結(jié)構(gòu)簡單、響應(yīng)速度快、環(huán)境適應(yīng)性強等優(yōu)勢,已成為主動流動控制技術(shù)和流體力學(xué)研究的前沿與熱點。相比于傳統(tǒng)兩電極激勵器,三電極等離子體高能合成射流激勵器具有更高的能量效率,形成射流沖量更大,有望成為新型快響應(yīng)直接力產(chǎn)生裝置。為揭示激勵器結(jié)構(gòu)對射流流場和沖量特性的影響規(guī)律,進而優(yōu)化激勵器結(jié)構(gòu)參數(shù),利用電參數(shù)測量裝置、高速陰影系統(tǒng)及自主設(shè)計的單絲扭擺式微沖量測量系統(tǒng)對不同射流孔徑、腔體體積和電極間距的三電極激勵器放電特性、射流流場及其沖量進行了實驗研究。為對比激勵器在不同工況條件下的工作特性,定義無量綱能量沉積ε和無量綱射流沖量I*,并分析了激勵器結(jié)構(gòu)參數(shù)對ε和I*的影響。結(jié)果表明對于給定無量綱能量沉積ε,激勵器存在最優(yōu)射流孔徑;激勵器無量綱能量沉積ε和無量綱射流沖量I*隨腔體體積增加而減小,隨激勵器電極間距增加而增加;射流強度及其流場影響區(qū)域隨腔體體積增加而減小,隨激勵器電極間距增加而增加。對比不同腔體體積和電極間距工況條件下I*隨ε的變化可知,為設(shè)計具有較好射流沖量水平的激勵器,在相同無量綱能量沉積ε條件下,應(yīng)盡量增大激勵器無量綱射流沖量I*。當(dāng)設(shè)計激勵器無量綱能量沉積ε小于初始工況時,應(yīng)增大初始工況激勵器腔體體積使無量綱能量沉積ε降低至設(shè)計值;當(dāng)設(shè)計激勵器無量綱能量沉積ε大于初始工況時,應(yīng)增大初始工況激勵器電極間距使無量綱能量沉積ε增加至設(shè)計值,使設(shè)計激勵器具有較好的射流沖量水平。
[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.
【作者單位】： 國防科學(xué)技術(shù)大學(xué)航天科學(xué)與工程學(xué)院;中國國防科技信息中心;
【基金】：國家自然科學(xué)基金(11372349) 全國優(yōu)秀博士論文作者專項資金(201058) 國防科技大學(xué)杰出青年基金(CJ110101)
【分類號】：O358

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