Diffusion combustion of liquid heptane in a small tube with and without heat recirculating
In order to understand diffusion flame characteristics in a small tube, combustion of liquid n-heptane and air was experimentally and numerically studied. A tube of ID 4mm and OD 6mm made of quartz was used as the burner. Liquid n-heptane was delivered into a capillary from a syringe pump. Stable...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/96734 http://hdl.handle.net/10220/13083 |
| _version_ | 1826129116407005184 |
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| author | Li, Junwei Huang, Jinghuai Zhao, Dan Zhao, Junying Yan, Mi Wang, Ningfei |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Li, Junwei Huang, Jinghuai Zhao, Dan Zhao, Junying Yan, Mi Wang, Ningfei |
| author_sort | Li, Junwei |
| collection | NTU |
| description | In order to understand diffusion flame characteristics in a small tube, combustion of liquid n-heptane and air was experimentally and numerically studied. A tube of ID 4mm and OD
6mm made of quartz was used as the burner. Liquid n-heptane was delivered into a capillary
from a syringe pump. Stable flames were established inside the burner with and without heat
recirculating. Additionally, numerical simulations were conducted, and effects of equivalence
ratio and external heat loss coefficient on diffusion flame were studied. Results show
that, for a diffusion flame of liquid n-heptane in a small tube, as fuel flow rate increases,
the flammable limits increase. The diffusion flame position moves downstream with increasing
air flow, eventually stabilizing at the bottom of the outer tube until extinction. When the
flame passes in the tube, the peak temperature would occur on the wall. If there is heat recirculating, the wall temperature of the inner tube is higher than the boiling point of liquid
n-heptane. It is conducive to the pre-evaporation of liquid n-heptane. In contrast, if there
is no heat recirculating, liquid fuel will be accumulated in the tube. The heat loss coefficient
has a great influence on flammable limits of the tube burner without heat recirculating. |
| first_indexed | 2024-10-01T07:35:46Z |
| format | Journal Article |
| id | ntu-10356/96734 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:35:46Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/967342020-03-07T13:19:21Z Diffusion combustion of liquid heptane in a small tube with and without heat recirculating Li, Junwei Huang, Jinghuai Zhao, Dan Zhao, Junying Yan, Mi Wang, Ningfei School of Mechanical and Aerospace Engineering In order to understand diffusion flame characteristics in a small tube, combustion of liquid n-heptane and air was experimentally and numerically studied. A tube of ID 4mm and OD 6mm made of quartz was used as the burner. Liquid n-heptane was delivered into a capillary from a syringe pump. Stable flames were established inside the burner with and without heat recirculating. Additionally, numerical simulations were conducted, and effects of equivalence ratio and external heat loss coefficient on diffusion flame were studied. Results show that, for a diffusion flame of liquid n-heptane in a small tube, as fuel flow rate increases, the flammable limits increase. The diffusion flame position moves downstream with increasing air flow, eventually stabilizing at the bottom of the outer tube until extinction. When the flame passes in the tube, the peak temperature would occur on the wall. If there is heat recirculating, the wall temperature of the inner tube is higher than the boiling point of liquid n-heptane. It is conducive to the pre-evaporation of liquid n-heptane. In contrast, if there is no heat recirculating, liquid fuel will be accumulated in the tube. The heat loss coefficient has a great influence on flammable limits of the tube burner without heat recirculating. 2013-08-12T08:39:46Z 2019-12-06T19:34:23Z 2013-08-12T08:39:46Z 2019-12-06T19:34:23Z 2012 2012 Journal Article Li, J., Huang, J., Zhao, D., Zhao, J., Yan, M.,& Wang, N. (2012). Diffusion Combustion of Liquid Heptane in a Small Tube with and without Heat Recirculating. Combustion Science and Technology, 184(10-11), 1591-1607. https://hdl.handle.net/10356/96734 http://hdl.handle.net/10220/13083 10.1080/00102202.2012.690673 en Combustion science and technology |
| spellingShingle | Li, Junwei Huang, Jinghuai Zhao, Dan Zhao, Junying Yan, Mi Wang, Ningfei Diffusion combustion of liquid heptane in a small tube with and without heat recirculating |
| title | Diffusion combustion of liquid heptane in a small tube with and without heat recirculating |
| title_full | Diffusion combustion of liquid heptane in a small tube with and without heat recirculating |
| title_fullStr | Diffusion combustion of liquid heptane in a small tube with and without heat recirculating |
| title_full_unstemmed | Diffusion combustion of liquid heptane in a small tube with and without heat recirculating |
| title_short | Diffusion combustion of liquid heptane in a small tube with and without heat recirculating |
| title_sort | diffusion combustion of liquid heptane in a small tube with and without heat recirculating |
| url | https://hdl.handle.net/10356/96734 http://hdl.handle.net/10220/13083 |
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