船用多级轴流压气机低工况扩稳优化研究

Optimization of Low-Condition Stability Extension in Marine Multistage Axial Compressor

关键词:  船用燃气轮机  低压压气机  气动设计方法  低工况稳定性  可转导叶

Key words:  Marine gas turbine  Low-pressure compressor  Aerodynamic design method  Low-condition stability  Adjustable guide vanes

摘要:

以船用九级轴流压气机为研究背景，探讨减少可转导叶列数的可行性，并提升低工况喘振裕度，通过数值模拟方法研究通流布局优化对压气机低工况稳定性的影响。通过特性分析和详细流场分析表明：一维关键参数选取对最佳可转导叶控制策略影响较大。优化部分级关键参数，不仅减少了可转导叶列数，而且提升了低转速下的喘振裕度，在75%转速下喘振裕度提升了2.27%，在70%转速下喘振裕度提升了3.3%。

Abstract:

In order to discuss the feasibility of reducing the number of adjustable guide vanes and improve the surge margin in a marine 9 stage axial compressor， the effects of flow layout optimization on the low-condition stability were studied by numerical simulation. Through characteristic analysis and detailed flow field analysis， the conclusion showed that the selection of one-dimensional key parameters had great influence on the optimal control strategy of adjustable guide vanes. The key parameters of part stages were optimized， which not only reduced the number of adjustable guide vanes， but also improved the surge margin at low rotation speed. The new low-pressure compressor obtained the surge margin improvement of 2.27% at 75% relative speed，and the surge margin improvement of 3.3% at 70% relative speed.