• CN:11-2187/TH
  • ISSN:0577-6686

›› 1989, Vol. 25 ›› Issue (2): 85-92.

• 论文 • 上一篇    下一篇

地面及飞行通用的燃气轮机最佳循环参数简化解及其应用

崔济亚   

  1. 北京航空航天大学
  • 发布日期:1989-03-01

A GENERALIZED SIMPLIFIED ANALYTICAL SOLUTION OF OPTIMUM CYCLE PARAMETERS FOR LAND AND FLIGHT GAS TURBINE ENGINES AND ITS APPLICATIONS

Cui Jiya   

  1. Beijing University of Aeronautics & Astronautics
  • Published:1989-03-01

摘要: 本文系统地推导出对地面及飞行燃气轮机通用的、各最佳循环参数的定比热循环参数的定比热简化解,包括前所未见的较繁的耗油率最佳压比的解,与压气机及涡轮定等熵效率或定多变效率的两种变比热准确作比较。从而看出:简化解可初估性能随压比变化的趋势及各最佳压比,可作准确解的起步,也可初估各最佳压比及其性能受部件参数及飞行条件影响的趋势;此外,简化解简捷地探求新循环的作用,也值得注意。

关键词: 简化解, 燃气轮机, 最佳压比

Abstract: Based on constant specific heat, a simplified solution is proposed for land and flight gas turbine performance and its four significant pressure ratios, I. E. for optimum thrust or work, for optimum core turbine outlet pressure and reheat, for optimum thermal efficiency and for hitherto not analytically analysed optimum specific fuel consumption. The sea level static and strate flight illustrative results are compared with two variable specific heat accurate computations with either isentropic or polytropic compressor and turbine efficiencies kept constant. It is not strange to see the simplified method deviate in absolute values of performance. Yet it is interesting to note this much simplier and quicker method predicting the trends of performance variation with pressure ratio and the four optimum pressure ratios as well as the trends of component and flight conditions effects on these optimum pressure ratios and their performance fairly well, being thus appropriate to be used for preliminary estimate in design. It may serve as a start for accurate solutions too. Besides, it would probably be helpful in analysing complex cycles and also in searching for new cycles. Notably, the static results are directly applicable to more general cases of gas turbine engines, e. g. stationary power units or mobile engines utilizing shaft power, with specific thrust value representing the square root of twice shaft work, and the variation of thermal efficiency just equivalent to the variation of reciprocal of specific fuel consumption on shaft power basis. The paper deals only with cycle analysis. Practical choice of compressor pressure ratios will be a compromise between the various optima, with due considerations given to off-design performance and a series of concrete engineering requirements.

Key words: 简化解, 燃气轮机, 最佳压比