光热汽轮机低压进汽结构气动性能分析与优化设计
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摘要
为满足新能源汽轮机低压进汽系统的开发,采用数值求解三维Reynolds-Averaged Navier-Stokes(RANS)方程研究了耦合第一级的光热汽轮机低压进汽结构的气动性能,并对无叶通道进行了优化设计,同时考虑了不同蒸汽调节阀结构对低压进汽系统通流能力的影响。结果表明:原始低压进汽结构会造成较宽跨度的静叶进汽攻角和较大的进汽不均匀度,最大汽流角分布在蜗壳的左右两侧;优化的策略在于增大进汽弯管的出流面积和倾角,通过减小滞止涡来降低汽流角跨度和进汽不均匀度,这样可以有效地改善第一级静叶进口的汽流组织;随着调节阀门偏心度的增加,蒸汽阀通流能力增大,且总压损失降低。研究方法和结果为高性能光热汽轮机通流设计提供了技术支撑。
In order to develop the steam admission system in low pressure cylinder for new-energy steam turbine,the aerodynamic performance of steam admission configuration coupled with the first stage is investigated by solving the Reynolds-averaged NavierStokes equation.The optimal design of non-vane passage is done and the influence of different steam inlet valves on steam admission system is also performed.The numerical results show that the original steam admission configurations lead to wide range of attack angle and large non-uniformity.The largest flow inlet angle is located at the left and right sides of steam volute.The optimization strategy is to increase the area and inclinations of steam admission elbows.The stagnation vortex is weakened to improve the steam organization in blade passage.The passable capacity is increased with the eccentricity,resulting in the decrease of total pressure loss.Relevant results of this study are expected to support the conjugated optimization design of non-vane and blade passage as well as the steam excited vibration in steam valves.
In order to develop the steam admission system in low pressure cylinder for new-energy steam turbine,the aerodynamic performance of steam admission configuration coupled with the first stage is investigated by solving the Reynolds-averaged NavierStokes equation.The optimal design of non-vane passage is done and the influence of different steam inlet valves on steam admission system is also performed.The numerical results show that the original steam admission configurations lead to wide range of attack angle and large non-uniformity.The largest flow inlet angle is located at the left and right sides of steam volute.The optimization strategy is to increase the area and inclinations of steam admission elbows.The stagnation vortex is weakened to improve the steam organization in blade passage.The passable capacity is increased with the eccentricity,resulting in the decrease of total pressure loss.Relevant results of this study are expected to support the conjugated optimization design of non-vane and blade passage as well as the steam excited vibration in steam valves.
引文
[1]陈昕,范海涛.太阳能光热发电技术发展现状[J].能源与环境,2012,(1):90-92.
[2]Shao W,Yang J,Li Z,et al.Numerical investigations on the aerodynamic performance of the low pressure cylinder with five stages for large power steam turbine[C].International Conference on Power Engineering 2013,Wuhan China,2013.
[3]李军,孙皓,罗常,等.轴流透平机械通流部分泄漏流动及其控制技术研究进展[C].中国动力工程学会透平专业委员会2009年学术研讨会,2009.
[4]李军,李志刚,晏鑫,等.大功率汽轮机低压排汽缸性能分析和气动设计的研究进展[C].中国动力工程学会透平专业委员会2012年学术研讨会论文集,2012.
[5]邵卫东,杨建道,杨锐,等.汽轮机低压末三级耦合排汽缸的气动性能研究[J].热力透平,2013,42(3):150-155.
[6]王世超,廖立,刘明军,等.汽轮机低压缸进汽通道结构对低压缸效率的影响[J].华东电力,2010,(5):733-736.
[7]唐宁,孟成,仪剑,等.汽轮机低压进汽结构设计的数值模拟分析[J].华东电力,2011,(8):1346-1349.
[8]刘伟,忻建华,叶春.汽轮机低压进汽结构对级效率的影响探究[J].汽轮机技术,2015,(4):267-269.
[2]Shao W,Yang J,Li Z,et al.Numerical investigations on the aerodynamic performance of the low pressure cylinder with five stages for large power steam turbine[C].International Conference on Power Engineering 2013,Wuhan China,2013.
[3]李军,孙皓,罗常,等.轴流透平机械通流部分泄漏流动及其控制技术研究进展[C].中国动力工程学会透平专业委员会2009年学术研讨会,2009.
[4]李军,李志刚,晏鑫,等.大功率汽轮机低压排汽缸性能分析和气动设计的研究进展[C].中国动力工程学会透平专业委员会2012年学术研讨会论文集,2012.
[5]邵卫东,杨建道,杨锐,等.汽轮机低压末三级耦合排汽缸的气动性能研究[J].热力透平,2013,42(3):150-155.
[6]王世超,廖立,刘明军,等.汽轮机低压缸进汽通道结构对低压缸效率的影响[J].华东电力,2010,(5):733-736.
[7]唐宁,孟成,仪剑,等.汽轮机低压进汽结构设计的数值模拟分析[J].华东电力,2011,(8):1346-1349.
[8]刘伟,忻建华,叶春.汽轮机低压进汽结构对级效率的影响探究[J].汽轮机技术,2015,(4):267-269.