摘要
针对船用燃机液体耦合式间冷器的稳态运行优化问题,本文定义了无量纲参数—等效间冷度,并推导其与机上换热器效率、机外换热器效率之间的关系,阐明了以等效间冷度作为表征间冷器对燃机性能影响的单一参数的可行性,从而弱化间冷器内部以及间冷器与燃机之间的耦合。建立了液体耦合式间冷器稳态变工况数学模型,变工况计算结果表明:间冷器空气侧的温降和压降均与等效间冷度呈线性负相关,而间冷器运行功耗与等效间冷度呈非线性正相关。进而以间冷器对燃机性能贡献最大和间冷器自身运行能耗最小为目标,建立了间冷器稳态运行的多目标优化模型,并设计了一种基于变步长搜索的分层序列法用于模型求解,仿真结果表明:该方法可使间冷器运行优化问题快速收敛至分层意义下的全局唯一最优解。
To optimize the steady-state operation of a fluid coupling-type intercooler applied to marine gas turbines,a dimensionless parameter called equivalent intercooler effectiveness was defined and its feasibility to use a single parameter to characterize the effect of intercooler on gas turbine performance was proven. Thus,the coupling between heat exchangers and that between the intercooler and gas turbine was weakened. A mathematical model was built to calculate the off-design condition of the fluid coupling-type intercooler. Calculation results under off-design condition indicated that both temperature and pressure drops on the air side of the intercooler have a linear negative correlation with equivalent intercooler effectiveness,while the operating energy consumption has a significant nonlinear positive correlation with equivalent intercooler effectiveness. Furthermore,taking the maximum contribution of the intercooler to gas turbine performance and minimum energy consumption of the intercooler itself as objective function,we established a multi-objective optimization model of the intercooler operating under steady state. A stratified sequencing method based on variable step search was designed to solve the multi-objective optimization problem. The simulation results showed that this method could perform fast convergence to a global optimal unique solution.
作者
季念坤
王志涛
李淑英
JI Niankun;WANG Zhitao;LI Shuying(College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2019年第4期767-773,共7页
Journal of Harbin Engineering University
基金
中央高校基本科研业务费专项资金项目(HEUCFM170301)
关键词
燃气轮机
液体耦合式间冷器
变工况
多目标优化
变步长搜索
分层序列法
稳态运行
gas turbine
fluid coupling-type intercooler
off-design condition
multi-objective optimization
variable step search
stratified sequencing method
steady-state operation
