Furthermore, those Top Gun military jets need to be up in the air in the wee hours – over land – to simulate their landings on aircraft carriers. But innovations out of the University of Cincinnati’s Gas Dynamics and Propulsion Laboratory are showing promise in reducing the intense noise of these supersonic jets without impacting their power. It’s research that can help neighborhoods slumber a little more soundly, keep their windows rattling a little less loudly and also protect the hearing of military personnel.
Research by Jeff Kastner, a research professor in the UC College of Engineering and Applied Science (CEAS), will be presented Aug. 21 at INTER-NOISE 2012, the 41st International Congress and Exposition on Noise Control Engineering, in New York City. Kastner will present on UC discoveries that use chevrons and fluidic injection to reduce supersonic jet noise.
Kastner’s research, supported by funding from the Office of Naval Research, is examining chevron technology developed at UC that has, in part, been commonly used in the commercial aviation industry to reduce noise on jet engines.
Chevrons – serrations on the exhaust side of a jet engine – are becoming more popular in commercial aircraft. They control the turbulence and resulting noise coming from the high-speed flow as it exhausts from the jet engine.
Kastner says the velocities of exotic military planes are much higher than commercial aircraft, which is the main reason they’re so much louder. Since chevrons can result in some fuel loss when controlling turbulence, Kastner’s research is testing fluidic technology to enhance the performance of chevrons for high-power military jets. He explains that since the planes only need the noise reduction during takeoff, his lab is exploring a chevron/fluidic injection system that can be turned on during takeoff and turned off when the plane is in the air, eliminating fuel loss.
“We are in the business of trying to quiet planes without impacting their fuel efficiency,” says Kastner.
Kastner says he and fellow researchers in UC’s Gas Dynamics and Propulsion Laboratory are testing multiple concepts that manipulate the turbulence in the jet exhaust to examine how those changes impact the sound field. That’s because noise is a byproduct of the turbulence, and so manipulating the turbulence can make it less efficient at producing noise.
The short-term goal of the UC research is to reduce noise by 3 decibels while ultimately reducing noise 10 decibels or more.
UC’s Gas Dynamics and Propulsion Laboratory is housed in the UC College of Engineering and Applied Science (CEAS), home of nearly 200 years of engineering innovation.
Dawn Fuller | Newswise Science News
Study sets new distance record for medical drone transport
13.09.2017 | Johns Hopkins Medicine
Researchers 'count cars' -- literally -- to find a better way to control heavy traffic
10.08.2017 | Florida Atlantic University
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Trade Fair News
15.12.2017 | Physics and Astronomy
15.12.2017 | Information Technology