Supersonic jet noise reduction
Collaborator: Prof. Wing Ng
Modern tactical aircraft engines and future propulsion concepts for supersonic transport aircraft produce intense noise familiar to anyone who has attended an airshow. Well beyond the annoyance to the general public, crewpersons on aircraft carriers must work for extended periods in the region of most intense noise emissions of these aircraft. Sadly, these crewpersons can incur lifelong hearing damage from their service. In our program, we seek to obtain new information on the fundamental behaviors of high speed jets, supporting strategies to reduce noise via operational and design changes. Using a new flow diagnostics approach, information about the speed and intensity intermittent turbulent waves is obtained and interpreted based upon nozzle conditions and theory for jet noise radiation. A highlight of the effort is continuing development focused on large-scale applications including measurements in actual tactical aircraft engine exhausts.
Selected publications:
- Ecker TE*, Lowe KT and Ng WF 2016 “On the distribution and scaling of convective wavespeeds in the shear layers of heated supersonic jets,” Flow, Turbulence and Combustion,doi:10.1007/s10494-016-9752-3.
- Ecker T*, Lowe KT, and Ng W 2016 “Scale-up of the time-resolved Doppler global velocimetry technique,” AIAA SciTech 2016, San Diego, CA, 4-8 January, paper AIAA-2016-0029.
- Ecker T*, Lowe KT and Ng WF 2015 "Eddy Convection in Developing Heated Supersonic Jets," AIAA Journal, 53(11), 3305-3315.
- Ecker T*, Lowe K T and Ng W F 2015 “A rapid response 64-channel photomultiplier tube camera for high-speed flow velocimetry,” Measurement Science and Technology, 26(2), 027001, 6pp.
- Ecker T,* Brooks DR* , Lowe KT and Ng W 2014 “Development and application of a point Doppler velocimeter featuring two-beam multiplexing for time-resolved measurements of high speed flow,” Experiments in Fluids, 55, 1819-1833.