Influence of shock waves from plasma actuators on transonic and supersonic airflowстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 22 ноября 2018 г.
Аннотация:This paper presents experimental and numerical investigations of high-current sliding surface
discharges of nanosecond duration and their effect on high-speed flow as plasma actuators in
a shock tube. This study deals with the effectiveness of a sliding surface discharge at low and
medium air pressure. Results cover the electrical characteristics of the discharge and optical
visualization of the discharge and high-speed post-discharge flow. A sliding surface discharge
is first studied in quiescent air conditions and then in high-speed flow, being initiated in the boundary layer at a transverse flow velocity of 50–950 m s−1 behind a flat shock wave in air of density 0.04–0.45 kg m−3. The discharge is powered by a pulse voltage of 25–30 kV and the electric current is ~0.5 kA. Shadow imaging and particle image velocimetry (PIV) are used to measure the flow field parameters after the pulse surface discharge. Shadow imaging reveals
shock waves originating from the channels of the discharge configurations. PIV is used to
measure the velocity field resulting from the discharge in quiescent air and to determine the
homogeneity of energy release along the sliding discharge channel. Semicylindrical shock waves
from the channels of the sliding discharge have an initial velocity of more than 600 m s−1. The
shock-wave configuration floats in the flow along the streamlined surface. Numerical simulation
based on the equations of hydrodynamics matched with the experiment showed that 25%–50%
of the discharge energy is instantly transformed into heat energy in a high-speed airflow, leading to the formation of shock waves. This energy is comparable to the flow enthalpy and can result in significant modification of the boundary layer and the entire flow.