Numerical Investigation of Plasma-Based Flow Control for Transitional Highly-Loaded Low-Pressure Turbine

摘要: Plasma-based active flow control was simulated numerically for the subsonic through a highly loaded low-pressure turbine. The configuration corresponded to previous experiments and computations which considered at Reynolds number of 25,000 based upon axial chord inlet conditions. In this situation, massive separation occurs on suction surface each blade due uncovered turning. present exploratory numerical study performed investigate use asymmetric dielectric-barrier-discharge actuators mitigating separation, thereby decreasing turbine wake losses increasing efficiency. Solutions were obtained Navier-Stokes equations, augmented by phenomenological model that used represent plasma-induced body forces imparted actuator fluid. method high-fidelity time-implicit scheme, employing domain decomposition carry out calculations parallel computing platform. A high-order overset grid approach preserved spatial accuracy in locally refined embedded region. magnitude force required is examined, both continuous pulse-modulated actuations are considered. Novel counterflow actuation also investigated, effects pulsing frequency duty cycle Features flowfields described, resultant solutions compared with other, mass-injection cases, baseline situation where no enforced.