火焰长度可调式燃烧器的数值模拟

对一种火焰长度可调式燃烧器的燃烧过程建立了数学物理模型，以Fluent63为平台，采用数值模拟的方法研究了热负荷及中心燃料流量与燃料总流量之比β对燃烧室内温度分布和火焰长度的影响.结果表明:改变外围燃气与中心燃气之间的流量比，能够在热负荷不变条件下，实现对燃烧室内温度场和火焰长度的调整.在同一热负荷条件下，燃烧室内的温度场和最高温度都依β而变.随β的增大，燃烧室内的前部高温区逐渐缩小，后部高温区逐渐增大并前移.当β小于05时，火焰长度随β的增大而缩短，而当β大于05时，火焰长度随β的增大而增长，β等于05时，火焰长度最短.

Numerical Simulation of An Adjustable Length of Flame Gas Burner

The effects of thermal load and the ratio(β)of centre and out ring fuel flow on the length of flame and temperature field in a combustion chamber were studied by a numerical models of an adjustable length of flame gas burner on the platform of Fluent 63. The results indicated that changing the β of the burner can adjust the length of flame and the temperature field in the combustion chamber under a constant thermal load. The temperature field and the highest temperature in the combustion chamber under a constant thermal load change with the different β. The front high temperature zone gradually shrinks， while the back high temperature zone gradually expands and moves forward with the increasing of β. The length of flame changes short or long with the increasing of β when β<05 or β>05， respectively， and it is the shortest when the β is 05.