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为了对整体煤气化联合循环(IGCC)燃气轮机的氢燃料先进旋涡燃烧室(advanced vortex com-bustor,AVC)结构设计提供理论依据,应用实验和数值模拟相结合的方法对AVC气流流动特性受燃烧室几何参数影响规律进行研究,在此基础上,确定氢燃料AVC内前、后钝体合理的布置方式.应用19步氢气和空气详细化学反应机制,对氢燃料AVC流动和燃烧特性进行数值模拟研究,结果显示:氢气和空气预混和气体主气流当量比为0.65时,在前、后钝体之间形成的凹腔内无喷射气流条件下,燃氢AVC能够形成稳定燃烧,出口温度被控制在1 950K以下,总压损失系数为2.7665%,燃烧效率为99.54%.相对于凹腔内无喷射气流,凹腔内有喷射气流的AVC旋涡在z轴方向分层有序、结构更加稳定,但不同xy截面上温度分布不同,导致出口截面温度分布不均匀,总压损失系数略有增大,燃烧效率提高了.
In order to provide theoretical basis for structural design of advanced vortex com-bustor (AVC) for integrated gasification combined cycle (IGCC) gas turbine, the combination of experimental and numerical simulation is used to analyze the flow characteristics of AVC gas flow in the combustion chamber Geometric parameters of the impact of law to study, based on this, to determine hydrogen fuel AVC before and after blunt body reasonable arrangement.Using 19 steps of detailed chemical reaction mechanism of hydrogen and air, hydrogen fuel AVC flow and combustion characteristics of a numerical simulation study The results show that when the equivalence ratio of hydrogen and air premixed gas is 0.65, stable hydrogen combustion can be formed under the condition of no jet flow in the cavity formed between the front and the back bluff bodies, and the outlet temperature is controlled at 1 950K, the total pressure loss coefficient is 2.7665% and the combustion efficiency is 99.54%. Compared with the non-jet flow in the cavity, the AVC vortex with jet airflow in the cavity is stratified z-axis direction and the structure is more stable, The different temperature distributions in different xy sections lead to uneven temperature distribution in the outlet section, a slight increase in the total pressure loss coefficient and an increase in combustion efficiency.