My graduate student, Alex Carr, defended his dissertation on sonic boom through the turbulent atmosphere. Title: SONIC BOOM PROPAGATION IN THE TURBULENT ATMOSPHERIC BOUNDARY LAYER Abstract: Sonic boom waveforms measured at ground level exhibit variability due to scattering and diffraction caused by the presence of turbulence in the atmospheric boundary layer (ABL). Sonic boom propagation …
Continue reading “Congratulations to Dr. Alex Carr on Defending his Ph.D.”
I’m pleased to see my student Dr. Jianhui Cheng defend her Ph.D. successfully at University of Florida. Title: THE APPLICATION OF INSTABILITY WAVE THEORY ON ACOUSTIC RADIATION WITHIN OFF-DESIGN SUPERSONIC JETS AND ON TWO-POINT STATISTICS WITHIN HIGH-SPEED FLOW OVER SHARP AND BLUNT CONES WITH PLASMA ACTUATION Abstract: The intense noise generated by large-scale turbulent structures …
Continue reading “Congratulations to Dr. Jianhui Cheng on Defending her Ph.D.”
The information needed by design engineers of either aircraft or flow machinery is the pressure, the shearing stress, the temperature, and the heat flux vector imposed by the moving fluid over the surface of a specified solid body or bodies in a fluid stream of specified conditions. To supply this information is the main purpose …
The whole problem of aerodynamics, both subsonic and supersonic, may be summed up in one sentence: Aerodynamics is the science of slowing-down the air without loss, after it has once been accelerated by any device, such as a wing or a wind tunnel. It is thus good aerodynamic practice to avoid accelerating the air more …
Sheet I of the U.S. Patent 1,504.663, by Orville Wright and J. M. H. Jacobs, illustrating their concept of a split flap.
He was introduced to the sensitivity of stalling characteristics of wings to the boundary layer state near the suction peak by a change in paint scheme! The XBT-1 a forerunner to the famous SBD Dauntless alrcraft had good stall characteristics. The XBT-2 had exactly the same wing but had an unacceptable stall. The XBT-1 wing …
Original flap development was motivated by three desired benefits. 1) slower flying speeds, hence shorter takeoff and landing runs; 2) reduction of angle of attack near minimum flying speed; 3) increase of drag, or control of drag, in order to steepen glide angle in approach and reduce floating tendencies. Currently, because of large aircraft noise …
This week I received tenure and promotion to Associate Professor of Mechanical and Aerospace Engineering at the University of Florida. It is a privilege to research, teach, and perform service here. I’m looking forward to many more years of working with wonderful colleagues and friends. The best part of the work has been helping my …
My good friend Thomas D. Norum recently passed away. He worked as a researcher at NASA Langley over most of his career. I knew him starting in 2009 through 2016 while I was working there. He worked as an experimentalist in the jet noise lab of NASA Langley. As an experimentalist, he worked to understand …
We have a responsibility to be more ethical than the society in which we exist.
