基于涡流发生器原理的先进旋涡燃烧室燃烧特性研究

Research of Combustion Characteristics of Advanced Vortex Combustor Based on Vortex Generator

为了研究基于涡流发生器(VG)射流原理的先进旋涡燃烧室(AVC)燃烧及流动性能,对不同射流参数(射流前倾角α、侧倾角β、射流孔径D及射流比R)时燃烧流场进行了数值模拟。结果表明,基于涡流发生器射流原理的AVC性能优于传统射流AVC。增大α及β,可以提高燃气掺混率,增大凹腔中心湍流度,并使更多的热能转化为燃烧室出口动能,但是总压损失明显增大。增大侧倾角β可使凹腔内高温分布更均匀。随着射流孔径D及射流比R的增大,燃烧室整体温度分布先增大后减小。当α=60°,β=60°时燃烧室能够在贫燃条件下实现高温、低压降、低污染的稳定燃烧。

The numerical simulation has been carried out to investigate the combustion and flow characteris-tics of Advanced Vortex Combustor （AVC） based on Vortex Generator （VG） by controlling anteversion angle （α）, sloping angle （β）, diameter of the injection hole （D） and the ratio of injection velocity to mainstream velocity （R） . The results show that AVC based on Vortex Generator has better performance than traditional in-jection AVC. It can improve gas mixing ratio, increase cavity center turbulence, and transform more thermal energy into kinetic energy of the outlet when increasingαandβ, while it increases the total pressure loss signifi-cantly. Cavity can achieve more uniform temperature distribution with increasing β. With increasing D and R, the overall temperature distribution of AVC firstly increases and then decreases. Stable combustion with higher temperature, lower total pressure loss and lower pollution emission can be achieved under lean conditions whenα=60°,β=60°.