论文部分内容阅读
为考察预混火焰面附近的湍流特性,以及湍流与化学反应相互作用的机理,采用激光多普勒技术(laser Doppler anemometry,LDA)对本生火焰和V型火焰的流场进行了诊断。分别通过固体粉末和雾化硅油液滴进行无条件和条件示踪,研究了全场及反应物来流的流动特性。无条件示踪的测量结果表明,火焰区的流场存在湍流度迅速增大然后衰减的现象,而速度的测值呈现双峰分布。条件示踪测量结果表明,在火焰区内反应物来流的流动特性并没有发生明显的改变。在剪切流场中,火焰面的脉动和皱褶不显著影响上游反应物的流动特性。
In order to investigate the turbulent characteristics near the premixed flame surface and the mechanism of interaction between turbulence and chemical reaction, laser Doppler anemometry (LDA) was used to diagnose the flow field of Bunsen flame and V flame. Unconditional and conditional tracing of the droplets of the solid powder and the atomized silicone oil was carried out to study the flow characteristics of the whole field and the reactants. The results of unconditional tracking show that there exists a phenomenon that the turbulence increases rapidly and then decays in the flow field of the flame zone, while the velocity measurement shows a bimodal distribution. Conditional trace measurements show that there is no significant change in the flow characteristics of the reactant stream in the flame zone. In the shear flow field, pulsation and wrinkling of the flame surface did not significantly affect the flow characteristics of the upstream reactants.