对发动机经济性能参数的分析

发动机的性能参数确定了发动机的总体性能和状态。在发动机研制和运行的全寿期内 ,其经济性最高的性能参数称作经济性能参数。发动机的热效率是评价其经济性的指标。本文从提高经济性的角度出发对发动机性能参数进行了分析 ,发现热效率不适宜作为选择发动机性能参数的经济性决策指标 ,而应以发动机全寿期的运行成本为决策指标才更为合理 ,因为它兼顾了研制和运行两方面的因素。通过一个等压加热循环的燃气涡轮发动机 ,建立了经济优化模型并得出了经济性能参数 ,进而说明 ,寻求和采用经济性能参数可考虑作为发动机决策的一个方面

The Analysis of Economic Performance Properties of Engines

Performance properties of an engine specify its performance and states.In the full life cycle of research,manufacture and operation of the engine, the performance properties which make the engine be in the state of maximal economic property are referred to as economic performance properties.Economic property of an engine not only incarnates in the develop stage but also in the full period of its develop and operation.From the point of view of improving economic property of engines,the analysis of engine properties is made in this paper.It is found that thermal efficiency is only an index to evaluate its economic property,but is unfitted to regard as a decision index for selecting economic performance properties of engines.For an engine of gas turbine,the economic optimization model is founded with the objective function of its life cycle cost,and the solution of the model is obtained by calculation.Through the comparison with the object function of thermal efficiency,the former can obtain economic performance properties of engines,whereas the latter cannot.It is emphasized in this paper that introducing the economic performance properties for developing engines,researching the methods and modes of determining the economic performance properties,and accumulating and collecting the information about the relationship between performance properties with costs are an important aspect of improving the performance of engines.