摘要
基于热力学第二定律,引入无量纲熵产数Ns表示燃气轮机装置热力性能完善程度,对其进行热力性能熵产分析.研究了表征燃气轮机装置热力性能参数:回热度σ、温度比τ、压力比π、循环有用功系数λ等对循环性能的影响及其相互关系.结果表明,采用有回热的循环Ns相比无回热的循环Ns明显减小,且在σ较大的情况下,Ns随π增大而增大,但变化不明显,随τ增大而减小.因此可通过增大τ、增大σ(≥0.7)和适当选取π以获得较大的循环热效率iη及较小的Ns.在较高τ的情况下,尽量提高λ,以减小Ns.
Analysis on thermodynamic performance of real gas turbine cycle, based on second law of thermodynamics was realized by application of non-dimensional entropy generation number Ns which indicates the rate of thermodynamic perfection. The study on thermodynamic parameters of gas turbine cycle shows that Ns of regenerative cycle is obviously lower than that of non-regenerative cycle; Ns rises to high value by increasing pressure ratio π and declines to low value by raising temperature ratio r when thermal ratio a is at relatively high value. Better thermal efficiency ηi and low Ns can be obtained respectively when a or r climbs up, a is greater than 0.7, and proper pressure ratio π is well adopted. Useful work ratio λ goes in inverse proportion to Ns in the case that r is at relatively high value.
出处
《上海理工大学学报》
EI
CAS
北大核心
2008年第6期523-527,共5页
Journal of University of Shanghai For Science and Technology
基金
国家自然科学基金重点资助项目(50636050)
上海市重点学科建设资助项目(J50501)
关键词
燃气轮机装置
回热器
热力性能参数
熵产分析
real gas turbine cycle
regenerator
thermodynamic parameters
entropy generation analysis
作者简介
余敏（1952-），女，教授．
