带增压压气机的小型脉冲爆震涡轴发动机性能分析

Performance Analysis of a Small Pulse Detonation Turboshaft Engine with a Booster

关键词:  涡轴发动机  脉冲爆震  冷却  增压压气机  性能分析

Key words:  Turboshaft engine  Pulse detonation  Cooling  Booster  Performance analysis

摘要:

为了解决小型涡轴发动机采用脉冲爆震燃烧室代替主燃烧室时，由于脉冲爆震燃烧室的增压作用，无法从压气机出口引气对燃气涡轮冷却、封严的问题，提出了一种带增压压气机的脉冲爆震涡轴发动机（PDTSE）构型，并建立了相应的部件特性和总体性能分析方法。对常规涡轴发动机与带增压压气机的PDTSE性能进行对比研究。计算结果表明：与常规涡轴发动机相比，带增压压气机PDTSE性能具有较大优势；在整个设计域内，在综合考虑了部件技术难度的情况下，在性能最优处，带增压压气机的PDTSE相比普通涡轴的热循环效率高15.7%，耗油率低9.5%，单位功率高26.9%。

Abstract:

In order to solve the problem that the pulse detonation turboshaft engine （PDTSE） has a difficulty in cooling and sealing the gas turbine due to the pressure increasement in the pulse detonation combustor， a booster behind the main compressor is utilized to increase the pressure ratio of the cooling flow. A performance model is established to study the components characteristics and the overall engine performance of the PDTSE with a booster． The overall performance of PDTSE with a booster and turboshaft were compared and analyzed and the results show that， because of its natural thermal advantage， the performance of PDTSE with a booster is much better than that of turboshaft engine. The results also suggest that at the best performance point of their design spaces with the consideration of the components technology， the thermal efficiency， specific fuel consumption and the specific power improvement of PDTSE with a booster is 15.7%， 9.5% and 26.9% ， respectively， compared with turboshaft engine.