Puja Upadhyay

Area of research

Aerospace Engineering · Computational Mechanics

Research interest

Research topics from publications: Studies on Microjet Control Effectiveness in High-Temperature Supersonic Impinging Jets; Development and Characterization of Ultra-High Frequency Resonance-Enhanced Microjet Actuator; Characterization and Validation of an Anechoic Facility for High-Temperature Jet Noise Studies; Flow and Acoustic Features of a Mach 0.9 Jet Using High Frequency Excitation; Active Control of Mach 0.9 Jet Using High Frequency Excitation. Representative work: This study examines the influence of jet temperature on the impinging jet flowfield and compares the effectiveness of microjet control for a Mach 1.5 ideally expanded jet. The tests were performed on a 36.2-mm-diam jet of air, heated to stagnation temperatures up to 1200 K. The jet impinged normally onto a traversable ground plane oriented between 1.5 and 12 throat diameters from the nozzle exit. Findings indicate that the impingement tones persist and generally become more prominent at higher temperatures, and the lift loss levels increase. Microjet injection produced substantial reductions of overall noise levels and considerable lift recovery, although the effectiveness is slightly lower For flow control applications requiring very high frequency excitation, mechanical actuators often lack the durability or the control authority to be consistently useful in highspeed flows. High frequency excitation attempted in the past has been limited to either low frequency actuation with reasonable control authority or high frequency actuation with limited control authority due to limitation in frequency and amplitude of the actuators involved. In the present paper, an extension of previous development of the Resonance Enhanced Microjet actuators has been undertaken to extend the range of frequencies accessible beyond the range previously studied. Using lumped element model as well as e