CAJ | 학술논문

采用雷诺应力模型(RSTM)对于两种多漩流器阵列结构的非反应流场进行了数值研究.在两种结构中一种为同旋向漩流器阵列,另一种为反旋向漩流器阵列,每种结构均按3×3阵列排布.计算结果表明,两种结构产生的流场十分复杂,同旋向漩流器结构中九个漩流器产生的回流区迅速变形衰减,在远离漩流器阵列的下游,形成了一个大的总体漩流;而在反旋向漩流器中各回流区维持了较长的长度.两种结构流场中存在的多个回流区及强湍流表明燃烧室有潜力实现良好的燃烧性能.通过将RSTM计算结果与激光多普勒测速仪(LDV)测量值进行比较发现,RSTM准确描述了绝大部分流动特性,较好地求解了回流区和高速度梯度问题.
채용뢰낙응력모형(RSTM)대우량충다선류기진렬결구적비반응류장진행료수치연구.재량충결구중일충위동선향선류기진렬,령일충위반선향선류기진렬,매충결구균안3×3진렬배포.계산결과표명,량충결구산생적류장십분복잡,동선향선류기결구중구개선류기산생적회류구신속변형쇠감,재원리선류기진렬적하유,형성료일개대적총체선류;이재반선향선류기중각회류구유지료교장적장도.량충결구류장중존재적다개회류구급강단류표명연소실유잠력실현량호적연소성능.통과장RSTM계산결과여격광다보륵측속의(LDV)측량치진행비교발현,RSTM준학묘술료절대부분류동특성,교호지구해료회류구화고속도제도문제.
The non-reacting fluid flow fields generated by multi-swirler arrays with two different configurations were investigated using Reynolds Stress Turbulence Model (RSTM) computationally. These two cases include a co-swirling array and a counter-swirling array, and each configuration consists of a three by three arrangement of swirl-ers. The computational results indicate that the flow fields considered here are of very complicated structures in both cases. In comparison, in the co-swirler configuration the recirculation zones generated by the nine swirlers deform and decay rapidly and a large unified swirling flow is formed far downstream of the swirler army, while in the other case the array retains the individual swirler characteristics across a longer distance. The existence of recirculation zones and strong turbulence levels in the two configurations indicate the potential for excellent combustion performance and Low Nox emissions. The RSTM-computed results were compared to Laser Doppler Velocimeter (LDV) meas-urements. The result comparison indicated that the RSTM accurately captured most of the flow characteristics and did a better job of resolving recireulation zones and high velocity gradients.