掺混腔室对透平性能影响的多工况对比研究

Comparative Study for Influence of Mixing Chamber on Turbine in Multiple Working Conditions

基于某变转速透平小机,采用数值模拟方法,研究了阀门全开和额定工况下,掺混腔室轴向长度对机组性能的影响,结果表明:随着掺混腔室轴向长度增加,级段效率逐渐提高,且额定工况效率增加的速度更快。掺混腔室轴向长度主要影响调节级(包含进汽室和掺混腔室)和第2级的性能。阀门全开工况下,随着掺混腔室轴向长度增加,调节级动叶域损失逐渐增大,但掺混腔室出口汽流均匀性得到改善,因此调节级效率逐渐降低,第2级效率逐渐提高。额定工况下,随着掺混腔室轴向长度增加,调节级动叶域损失逐渐减小,掺混腔室出口汽流均匀性得到改善,因此调节级和第2级效率均逐渐提高。

Based on a low-power turbine with variable speed,the influence of axial length of mixing chamber on performance of turbine unit with the valve fully opened and in rated working conditions is studied by numerical simulation method.The results show that,along with the increase of axial length,the multistage efficiency is improved gradually and enhanced faster in rated working condition.The axial length of mixing chamber only affects the performance of control stage(including the inlet and mixing chamber)and the second stage.In valve fully opened working condition,along with the increase of axial length of mixing chamber,the moving blade loss of control stage increases gradually,but the steam flow uniformity at the outlet of mixing chamber is improved,so the efficiency of control stage reduces gradually,and the efficiency of the second stage is enhanced gradually.In rated working condition,along with the increase of axial length,the blade loss of control stage reduces gradually,and the steam flow uniformity at the outlet of mixing chamber is improved,so the efficiency of control stage and the second stage is enhanced.