東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Dynamics of perturbed exothermic blu...

Georgia Institute of Technology.

Linked to FindBook

Google Book

Amazon

博客來

Dynamics of perturbed exothermic bluff-body flow-fields.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Dynamics of perturbed exothermic bluff-body flow-fields./
Author:	Shanbhogue, Santosh Janardhan.
Description:	159 p.
Notes:	Adviser: Tim Lieuwen.
Contained By:	Dissertation Abstracts International69-09B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3327654
ISBN:	9780549800934

Dynamics of perturbed exothermic bluff-body flow-fields.
Shanbhogue, Santosh Janardhan.

Dynamics of perturbed exothermic bluff-body flow-fields. - 159 p.

Adviser: Tim Lieuwen.

Thesis (Ph.D.)--Georgia Institute of Technology, 2008.

The first part of this thesis reviews the fluid mechanics of non-reacting and reacting bluff body flows.

ISBN: 9780549800934Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Dynamics of perturbed exothermic bluff-body flow-fields.
LDR:03253nam 2200337 a 45 001 861544
005 20100719
008 100719s2008 ||||||||||||||||| ||eng d
020 $a 9780549800934
035 $a (UMI)AAI3327654
035 $a AAI3327654
040 $a UMI $c UMI
100 1 $a Shanbhogue, Santosh Janardhan. $3 1029257
245 1 0 $a Dynamics of perturbed exothermic bluff-body flow-fields.
300 $a 159 p.
500 $a Adviser: Tim Lieuwen.
500 $a Source: Dissertation Abstracts International, Volume: 69-09, Section: B, page: 5562.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2008.
520 $a The first part of this thesis reviews the fluid mechanics of non-reacting and reacting bluff body flows.
520 $a This thesis describes research on acoustically excited bluff body flow-fields, motivated by the problem of combustion instabilities in devices utilizing these types of flame-holders.
520 $a Vortices/convective-structures play a dominant role in perturbing the flame during these combustion instabilities. This thesis addresses a number of issues related to the origin, evolution and the interaction of these structures with the flame.
520 $a The second part describes the spatio/temporal characteristics of bluff-body flames responding to excitation. The key processes controlling the flame response have been identified as (1) the anchoring of the flame at the bluff body, (2) the excitation of flame-front wrinkles by the oscillating velocity field and (3) flame propagation normal to itself at the local flame speed. The first two processes control the growth of the flame response and the last process controls the decay.
520 $a The third part of this thesis describes the effect of acoustic excitation on the velocity field of reacting bluff body flows. Acoustic disturbances excite the Kelvin-Helmholtz (KH) instability of the reacting shear layer. This leads to a spatially decaying vorticity field downstream of the bluff body in the shear layers. The length over which the decay occurs was shown to scale with the length of the recirculation zone of the bluff body, i.e. the length over which the velocity profile transitions from shear layer to wake. The flame influences this decay process in two ways. Gas expansion across the flame reduces the extent of shear by reducing the magnitude of negative velocities within the recirculation zone. This combined with the higher product diffusivity reduces the length of the recirculation zone, thereby further augmenting the decay of the vorticity fluctuations. Lastly, these results also revealed the phase jitter - a cycle-to-cycle variation in the position of the rolled-up vortices. Close to the bluff-body, phase jitter is very low but increases monotonically in the downstream direction. This leads to significant differences between instantaneous and ensemble averaged flow fields and, in particular, the decay rate of the vorticity in the downstream direction.
590 $a School code: 0078.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0538
690 $a 0548
690 $a 0759
710 2 $a Georgia Institute of Technology. $3 696730
773 0 $t Dissertation Abstracts International $g 69-09B.
790 $a 0078
790 1 0 $a Lieuwen, Tim, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3327654