摘要
叶顶间隙的尺寸虽小,但对流道内的流动影响很大。研究烟气轮机叶顶隙的气固特性可以为解决烟气轮机结垢问题提供依据。采用标准k-?湍流模型和DPM多相流模型,对烟气轮机气固两相运动规律进行研究。研究表明:静叶间隙流的压能、热能转化为动能的转化率比主流小;动叶间隙流不作用在叶片上,受主流的影响流速先增大后减小;因为压力差的存在,叶顶隙处会产生从压力侧到吸入侧的间隙流;静叶间隙流周向速度与主流相反,在靠近吸力面和压力面处出现旋涡;动叶叶顶、叶尖以及压力面后半段是颗粒浓度和颗粒沉积量大的区域;动叶机壳的前半段以及动叶叶顶的前2/3处颗粒沉积量比较大。
The size of tip clearance is small but it has great influence on flow in channels. Study on gas solid characteristics at blade tip gap of gas turbines can provide fundamental data about fouling problems. Standard k-？ two equation turbulence model and DPM multiphase flow model were employed to simulate gas-solid two phase motion in flue gas turbine. The results show that the conversion of kinetic energy from the pressure and heat energy in stator blade clearance flow is smaller than that of main flow. The gap flow does not work on blades in rotor blades, and the flue gas velocity increases and then decreases with the influence of main flow. Clearance flow is generated from the pressure side to the suction side at the blade tip clearance because of pressure difference. The circumferential velocity of the stator clearance flow is opposite to the mainstream, and vortex appears near suction and pressure surface. Rotor blade top, blade tip and the latter part of the pressure surface are regions with high particle concentration and deposition. Particle deposition is relatively high at the first half of the rotor blade casing and the first 2/3 of the rotor blade tip.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2017年第5期1080-1087,共8页
Journal of Chemical Engineering of Chinese Universities
基金
山东省自然科学基金(ZR2015EM026)
关键词
烟气轮机
叶顶隙
气固两相
模拟
flue gas turbine
tip clearance
gas-solid two-phase
simulatio
