Experimental validation of an integrated optimization design of a radial turbine for micro gas turbines

The aerodynamic performance, structural strength, and wheel weight are three important factors in the design process of the radial turbine for micro gas turbines. This study presents the experimental validation process of this integrated optimization design method by using the similarity theory. Cold modeling tests and investigations into the aerodynamic characteristics were performed. Experimental results showed that the aerodynamic efficiency of the micro radial turbine is 84.3% at the design point while also satisfying the aerodynamic and strength requirements. Meanwhile, the total weight of the turbine wheel is 3.8 kg which has only a 52.8% mass of the original design. This indicates that the radial turbine designed through this technique has a high aerodynamic performance, and thus can be applied to micro gas turbines. The results validated that this integrated optimization design method is reliable.

题目：微型燃气轮机向心涡轮一体化寻优设计方法的试验验证 目的：根据微型燃气轮机的特点及其应用领域，针对其核心部件向心涡轮的设计，提出一体化寻优设计方法，并搭建向心涡轮性能试验台进行试验验证，以期检验一体化设计方法的可靠性，获得微型向心涡轮高转速性能试验方法并解决性能试验中出现的实际问题。 创新点：1.一体化设计方法是以向心涡轮气动性能、叶轮材料强度和叶轮整体重量为优化目标的全新寻优设计方法；2.针对悬臂式高速小型轴系解决微型向心涡轮高速试验轴承轴系设计问题。 方法：1.搭建和完善包含多个子系统的试验台，并给出轴承设计的结果；2.根据相似理论和微型向心涡轮一体化寻优设计结果，对原型进行模化及涡轮试验件的加工；3.开展微型向心涡轮高速性能试验，针对向心涡轮的通流特性和效率特性进行试验数据采集和结果分析，并评估和验证微型向心涡轮一体化寻优设计方法的可靠性和应用性。 结论：1.在满足材料强度和整体重量要求的前提下，叶轮气动性能仍具有较高的水平，可应用于100 kW级微型燃气轮机。2.试验工作验证了本文提出的向心涡轮一体化寻优设计方法的可靠性，发展了微型向心涡轮的综合设计方法，以期在工程领域得到进一步的应用。