BEGIN:VCALENDAR

VERSION:2.0

PRODID:-//wp-events-plugin.com//6.6.4.4//EN

TZID:Asia/Jerusalem

X-WR-TIMEZONE:Asia/Jerusalem
BEGIN:VEVENT

UID:0-480@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20160418T163000

DTEND;TZID=Asia/Jerusalem:20160418T173000

DTSTAMP:20230603T191554Z

URL:https://aerospace.technion.ac.il/events/enhancement-of-internal-heat-t
 ransfer-in-low-nox-gas-turbine-combustion/

SUMMARY:Enhancement of Internal Heat Transfer in Low Nox Gas Turbine Combus
 tion
DESCRIPTION:Lecturer:Daniel Kutikov\n Faculty:Department of Aerospace Engin
 eering\n Institute:Technion – Israel Institute of Technology\n Location:
 Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstrac
 t: \n Details: \n Pollutant emissions from combustion systems created incr
 easing environmental and health concerns. Regulations controlling pollutan
 t emissions steadily become stricter. Nitrogen oxides (NOx) are currently 
 regarded as the most harmful pollutants emitted during fuel-air combustion
 . Existing low NOx techniques all have significant drawbacks\, namely\, lo
 w combustion stability\, complex layout and large combustor volume. The st
 rict pollutant emission policies and the drawbacks of existing low NOx tec
 hniques motivate research on reduction of pollutant emissions from gas tur
 bines.\nThe formation of pollutants in combustors is strongly affected by 
 processes of internal heat transfer and mixing by means of hot spots forma
 tion modification. The current research intended to investigate the impact
  of tangential swirl on the heat transfer and mixing in gas turbine combus
 tors with regard to NOx emission reduction. A novel combustor concept\, ba
 sed on flame cooling by pure heat transfer between the primary and seconda
 ry flows\, was tested in course of the research.\nA comprehensive review o
 f swirl-combustion interaction\, carried out in course of the research\, r
 evealed three major routes of swirl impact on NOx formation. The swirl imp
 act routes of heat transfer rate augmentation and flame elongation have a 
 potential of NOx emission reduction\, while the swirl impact route of hot 
 core formation may lead to NOx emission increase. These routes were invest
 igated at the present study by means of analytical investigation as well a
 s heat transfer and combustion experiments using a small-scale gas turbine
  combustor model. For evaluation of swirl impact\, the experiments were pe
 rformed for swirl flow and axial flow layouts. A novel method for convecti
 ve heat transfer measurements was developed in course of the experiments.\
 nThe heat transfer experiments demonstrated that the increase of convectiv
 e heat transfer coefficient due to swirl introduction is insufficient in r
 egard to NOx emission reduction in gas turbine combustors. No remarkable e
 ffect of flow rate or temperature difference (which in a swirl flow could 
 modify the flow pattern) on convective heat transfer coefficient was obser
 ved.\nThe nearly constant overall equivalence ratio in the combustion expe
 riments matched the most stable combustion regime and was equal to about 0
 .15. The equivalence ratio in the primary zone was near unity. The combust
 ion experiments demonstrated an increase of NOx emission by a factor of ab
 out 2\, due to the introduction of swirl. This proved that the hot core fo
 rmation due to the swirling of the flow is dominant for gas turbine combus
 tors with tangential swirl.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

END:VEVENT

BEGIN:VTIMEZONE

TZID:Asia/Jerusalem

X-LIC-LOCATION:Asia/Jerusalem

BEGIN:DAYLIGHT

DTSTART:20160325T030000

TZOFFSETFROM:+0200

TZOFFSETTO:+0300

TZNAME:IDT

END:DAYLIGHT

END:VTIMEZONE
END:VCALENDAR