Numerical investigation of spray combustion in jet mixing type combustor for low NOx emission

被引：12

作者：

Watanabe, Hirotatsu ^{[1
]}

Suwa, Yoshikazu ^{[2
]}

Matsushita, Yohsuke ^{[1
]}

Morozumi, Yoshio ^{[1
]}

Aoki, Hideyuki ^{[1
]}

Tanno, Shoji ^{[1
]}

Miura, Takatoshi ^{[1
]}

机构：

[1] Tohoku Univ, Dept Chem Engn, Grad Sch Engn, Sendai, Miyagi 9808579, Japan

[2] SHI Mech & Equipment Inc, Dev & Proc Grp, Dept Engn, Saijyo, Ehime 7991393, Japan

来源：

ENERGY CONVERSION AND MANAGEMENT | 2008年 / 49卷 / 06期

关键词：

spray combustion; numerical simulation; low-NOx emission;

D O I：

10.1016/j.enconman.2007.12.002

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The present paper describes a numerical investigation of spray combustion in a jet mixing type combustor. In this combustor, kerosene spray was injected with a pressure atomizer, and high speed combustion air was introduced towards the spray flow through some inlet air nozzles to improve mixing of the spray and the air. In the numerical simulation, the conservative equations of mass, momentum and energy in the turbulent flow field were solved in conjunction with the k-epsilon two equation turbulence model. The effects of the diameter and the number of air inlet nozzles on the combustion behavior and NO emission were numerically investigated. When the diameter of the inlet air nozzle decreased from 8 to 4 mm, the calculated NO mole fraction in the exhaust gas was drastically decreased by about 80%. An increase in the inlet velocity resulted in improvement of the mixing of the spray and the air, and hence, the high temperature region where thermal NO was formed became narrow. As a result, the exhaust NO mole fraction decreased. Furthermore, a decrease in exhaust NO mole fraction was explained by a decrease in the residence time in the high temperature region above 1800 K. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1530 / 1537

页数：8

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