VTechWorks staff will be away for the winter holidays starting Tuesday, December 24, 2024, through Wednesday, January 1, 2025, and will not be replying to requests during this time. Thank you for your patience, and happy holidays!
 

A gravity update scheme using PID controller for droplet traveling at terminal velocity in air flow

Simple item page
dc.contributor.authorLin, Yushuen
dc.contributor.authorPalmore, John A., Jr.en
dc.date.accessioned2022-02-11T17:42:38Zen
dc.date.available2022-02-11T17:42:38Zen
dc.date.issued2021-05-26en
dc.date.updated2022-02-11T17:42:36Zen
dc.description.abstractTo improve the combustion efficiency in gas turbines, it will be important to find out positions of droplets and the evaporated fuel vapors in the combustion chamber. In our study, we investigate the drag coefficient of droplets, because drag force will affect droplet dynamics. In practice, simple drag correlations are commonly used in DNS, which are single-parameter dependent on Reynolds number. However, if droplets have complex interactions with the flow, more parameters should be taken into consideration. For example, in gas turbine combustion, it is natural to think that deformation, evaporation and internal circulation of droplets have impact on drag coefficient as well. Therefore, drag coefficient will have a dependence on related parameters (effective diameter, Weber number, density ratio, etc.). To reveal the dependence of drag coefficient on probable parameters, we perform simulations of an evaporating droplet traveling at its terminal velocity in high-temperature air by using the numerical framework developed by our research group. This framework uses an interface-capturing DNS for vaporizing multiphase flows. Since the drag force is dynamically changing, an algorithm which updates the gravity to balance the drag force is developed. We incorporate PID controller in our scheme to mimic the difference between gravity and drag force in a more robust manner compared to our previous work [Setiya and Palmore, ESSCI, 2020]. The resultant gravity is then used to characterize the behavior of drag coefficient.en
dc.format.mimetypeapplication/pdfen
dc.identifier.orcidPalmore, John [0000-0001-6054-9191]en
dc.identifier.urihttp://hdl.handle.net/10919/108313en
dc.language.isoenen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.titleA gravity update scheme using PID controller for droplet traveling at terminal velocity in air flowen
dc.typeConference proceedingen
dc.type.dcmitypeTexten
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Engineeringen
pubs.organisational-group/Virginia Tech/Engineering/Mechanical Engineeringen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Engineering/COE T&R Facultyen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Lin, Palmore - 2021 - A gravity update scheme using PID controller for droplet traveling at terminal velocity in air flow.pdf
Size:
920.87 KB
Format:
Adobe Portable Document Format
Description:
Conference paper
Download

Collections

All Faculty Deposits
Scholarly Works, Mechanical Engineering