Effect of DBD plasma excitation characteristics on turbulent separation over a hump model  

作　　者：Lu MA Xiaodong WANG Jian ZHU Shun KANG 马璐;王晓东;祝健;康顺(Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education,North China Electric Power University)

机构地区：Key Laboratory of Condition Monitoring and Control for Power Plant Equipment,Ministry of Education,North China Electric Power University,Beijing 102206,People＇s Republic of China

出　　处：《Plasma Science and Technology》2018年第10期135-145,共11页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (No. 51576065);the Fundamental Research Funds for the Central Universities (Nos. 2015CY05, 2018QN037, 2018ZD09)

摘　　要：In this paper, the effect of dielectric-barrier discharge plasma excitation characteristics on turbulent boundary layer separation over a hump is investigated using computational fluid dynamics. Four different turbulence models were used for verification. The Reynolds stress model showed the best agreement with the experimental data, in general. Based on the verification and validation, the effect of duty cycle and excitation frequency on the turbulent flow separation were investigated. The results showed that the pulsed plasma excitation could effectively suppress the flow separation by mixing augmentation. With increasing duty cycle and excitation frequency, the flow separation first increased, then decreased again. The optimal duty cycle was 0.75 and the optimal excitation frequency was 50 Hz.In this paper, the effect of dielectric-barrier discharge plasma excitation characteristics on turbulent boundary layer separation over a hump is investigated using computational fluid dynamics. Four different turbulence models were used for verification. The Reynolds stress model showed the best agreement with the experimental data, in general. Based on the verification and validation, the effect of duty cycle and excitation frequency on the turbulent flow separation were investigated. The results showed that the pulsed plasma excitation could effectively suppress the flow separation by mixing augmentation. With increasing duty cycle and excitation frequency, the flow separation first increased, then decreased again. The optimal duty cycle was 0.75 and the optimal excitation frequency was 50 Hz.

关 键 词：flow control numerical simulation DBD plasma excitation frequency 

分 类 号：O35[理学—流体力学]