The intercooling recuperated cycle (ICR) is commonly employed in marine gas turbines to enhance thermal efficiency. However, the addition of an intercooler may lead to the increased dimension and structural complexity of marine ICR gas turbines. To address this issue, we propose an improved configuration of the intermediate pressure compressor – an axial-centrifugal combined compressor (ACC) with high inlet hub-tip ratio and high flow rate. The aerodynamic performance of the ACC at multi-operating points is optimized via an improved free-form deformation method for the parametric modeling of the flow paths and blades of turbomachinery. The result indicates that the number of stages decreases from 6 to 3 and the axial length is reduced by 38.3% after modification. The adiabatic efficiency of the optimized ACC at the design and low-speed operating points is improved by 1.18% and 6.48% respectively. Additionally, the ACC redesigned scheme can reduce the axial length, maximize the flow path space utilization, enhance the stage load capacity, and significantly improve the low-speed performance. This provides a reference for developing advanced marine ICR gas turbines with high power and low fuel consumption.

中文翻译：

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船用中冷同流式燃气轮机中压压气机气动改造与优化


中冷同热循环（ICR）通常用于船用燃气轮机以提高热效率。然而，中间冷却器的增加可能会导致船用ICR燃气轮机的尺寸增加和结构复杂性增加。为了解决这个问题，我们提出了一种改进的中压压缩机配置——具有高入口毂尖比和高流量的轴流离心组合压缩机（ACC）。通过改进的自由变形方法，对涡轮机械的流道和叶片进行参数化建模，优化了 ACC 在多工作点的空气动力学性能。结果表明，改造后级数由6级减少为3级，轴向长度减少了38.3%。优化后的ACC在设计点和低速工况点的绝热效率分别提高了1.18%和6.48%。此外，ACC重新设计的方案可以减少轴向长度，最大限度地提高流道空间利用率，增强级负载能力，并显着提高低速性能。这为开发先进的大功率、低油耗船用ICR燃气轮机提供了参考。