Influence of the Projectile Rotation on the Supersonic Fluidic Element

Article Engineering, Mechanical

Fluid Dynamics of a Bistable Diverter Under Ultrasonic Excitation-Part I: Performance Characteristic

Michael Mair et al.

Summary: This study investigates the switching characteristics and flow field modes of an ultrasonically driven bistable fluidic diverter under different conditions. The experiments found that a specific jet mode needs to be excited to promote switching at high Mach numbers.

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME (2021)

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Article Engineering, Mechanical

Fluid Dynamics of a Bistable Diverter Under Ultrasonic Excitation-Part II: Flow Visualization and Fundamental Mechanisms

Michael Mair et al.

Summary: The switching mechanism and flow physics of an actively controlled fluidic device using acoustic excitation to control jet movement are investigated. Acoustic excitation at the preferred frequency results in high saturation amplitudes and the formation of large vortical structures. The change in excitation mode triggering the switching process from a shear layer-based mode to a jet orifice mode with increasing Reynolds number is explained by examining basic flow features, including shear layer instabilities.

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME (2021)

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Article Acoustics

Experimental analysis of the acoustic field of an ultrasonic pulse induced by a fluidic switch

Benjamin Buehling et al.

Summary: An alternative approach for ultrasound generation is presented in this study, where the signal is generated by a fluidic switch with comparable amplitude to that of a commercial ACU transducer.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2021)

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Article Thermodynamics

Numerical study of the switching mechanism of a jet valve using the meshless method

Jun Zhang et al.

Summary: This study investigates the fluid dynamics of a supersonic jet flow using numerical methods, focusing on the interaction between the jet flow and a ball-shaped plug, as well as the switching mechanism of a novel jet valve. The research highlights the importance of high pressure control inlets and initial fluid conditions for the successful operation of the jet valve.

ADVANCES IN MECHANICAL ENGINEERING (2021)

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Article Physics, Fluids & Plasmas

Switching Action of a Bistable Fluidic Amplifier for Ultrasonic Testing

Thorge Schweitzer et al.

Summary: Air-coupled ultrasonic testing is widely used in various industries for non-destructive testing of composite materials, particularly in large concrete structures that may lead to catastrophic failures. A novel fluidic transducer based on a bistable fluidic amplifier is investigated in this study, which has shown to produce high-power broadband ultrasonic signals through its switching action. Parametric CFD simulations were performed to analyze the switching behavior of the fluidic switch, revealing an inversely proportional relationship between flow velocity in the throat and switching time.

FLUIDS (2021)

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Article Engineering, Aerospace