涡扇发动机内外函回热分析

对吴仲华教授提出的航空涡扇发动机改为陆用输出轴功的一种最安全可靠办法—将外函空气由内函动力透平排气回热后也输出轴功，进行了基本的热力循环分析。按初步分析可知，此法宜用于函道比接近于１的总压比不太高的机组。按目前技术水平，采用此措施可以达到比“切顶”相对提高效率与功率１０％左右。在我国有一定的应用前景。

RECUPERATION OF TURBOFAN ENGINE AND ITS THERMODYNAMIC ANALYSIS

A novel method for modifying a turbofan aeroengine into a land-base turboshaft engine was proposed by late Prof.C.H.Wu.In this case,the exhaust of hot core flow is used to recuperate the bypass flow,therefore,it is not necessary to redesign the low pressure compressor (fan) and the low pressure turbine.A comprehensive thermodynamic analysis is given to study the applicable range and results of this proposal.It is found that such modification is suitable for the turbofan engines with bypass ratio approximately equal to 1.The optimum total pressure ratio for efficiency is rather low and approximate to the optimum pressure ratio of pure gas turbine for specific output.The obtainable system efficiency and power can be higher than the conventional modification method (cutting the top of fan blade) for about 10% relatively.