摘要
为研究涡轮盘腔出流的非定常特征,通过求解非定常RANS方程组和SST湍流模型,得到了不同冷气质量流量比(MFR)下高压涡轮级内部的流场特征。结果表明:泄漏流的影响区域主要位于动叶栅内;动静叶片相对运动所带来的非定常干涉使得封严出口周向压差系数增大,MFR为0.4%时发生燃气倒灌,此时泄漏气体与高温主流在端区交替流动;当MFR增大至1%时,燃气入侵得到抑制,且动叶前缘绝热气膜有效度增大近2倍,但该区域的温度脉动加剧;MFR为0.4%时绝热气膜有效度脉动相对高值区域主要位于流道中间,MFR为1%时则位于叶片壁角区域。
To study the unsteady characteristics of turbine disc cavity outflows,the flow field in high-pressure turbine stages under different coolant mass flow ratios(MFRs)was obtained by solving the unsteady RANS equations with the SST turbulence model.Results show that the purge flow mainly affects the area in downstream rotor cascade.The interference of the unsteady potential field caused by relative motion of rotor blade enhances the fluctuation of circumferential pressure at the exit of rim seal.Hot gas ingestion happenes at MFR=0.4%,when the purge gas and the main stream alternatively flow in the endwall region.When the MFR gets up to 1%,the gas ingestion is suppressed,and the adiabatic film cooling effectiveness at leading dege of the blade is about twice of that in the case of MFR=0.4%,but where the temperature fluctuation is aggravated.The relatively high fluctuation of adiabatic film cooling effectiveness mainly lies in the middle of the flow passage at MFR=0.4%,which is in the area near the blade surface at MFR=1%.
作者
陆泽帆
陈榴
张发生
班宇
戴韧
LU Zefan;CHEN Liu;ZHANG Fasheng;BAN Yu;DAI Ren(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Hangzhou Steam Turbine&Power Group Co.,Ltd.,Hangzhou 310016,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2020年第2期131-137,共7页
Journal of Chinese Society of Power Engineering
基金
上海市科委战略新兴产业引导专项资助项目(16DZ1121202)。
