一种考虑传热现象的船用压气机等熵效率分区域建模方法  

A Zonal Modeling Approach of Marine Compressor Isentropic Efficiency with Consideration of Heat Transfer Phenomenon

作　　者：沈浩生[1] 张均东[1] 杨柏丞[2] 贾宝柱 SHEN Haosheng;ZHANG Jundong;YANG Baicheng;JIA Baozhu(Dalian Maritime University,Marine Engineering College,Liaoning Dalian 116026,China;Dalian Maritime University,Navigation College,Liaoning Dalian 116026,China;Marine College,Guangdong Ocean University,Guangdong Zhanjiang 52400,China)

机构地区：[1]大连海事大学轮机工程学院,辽宁大连116026 [2]大连海事大学航海学院,辽宁大连116026 [3]广东海洋大学海运学院,广东湛江524088

出　　处：《船舶工程》2020年第7期76-87,共12页Ship Engineering

基　　金：国家自然科学基金(51479017);辽宁省自然科学基金(201602071);基本科研业务费(3132019315)。

摘　　要：为提升全任务轮机模拟器中主柴油机的动态仿真精度,提出一种考虑传热现象的压气机等熵效率分区域建模方法。对压气机性能图谱中的等熵效率数据进行传热校正,对一种广泛应用的压气机等熵效率模型进行改进,利用性能图谱中已有的等转速线将"比焓变-质量流量"平面划分为若干个区域,采用各区域上下限等转速线对应的样本数据将模型参数化。仿真结果表明:相比原模型,分区域等熵效率模型的预测精度有所提升,校正之后的决定系数由0.967 5增大至0.985 8,最大绝对相对误差由6.796 7%下降至2.553 5%,平均绝对百分误差由0.903 8%下降至0.642 8%;分区域等熵效率模型能较为合理、稳健地外推至非设计工况区域,向高转速区域外推时的平均绝对百分误差仅为0.842 2%,向低转速区域外推时为2.031 8%。考虑到分区域等熵效率模型的结构紧凑、计算速度快,同时能给出令人满意的预测精度和外推能力,可将其应用于基于模型的控制和故障诊断等研究领域中。To improve the dynamic simulation accuracy of the main engine in the full-mission marine engineering simulator, a zonal modeling approach of compressor isentropic efficiency with the consideration of heat transfer phenomenon is proposed. The method proposed by Prof. Casey is adopted to the correction of the isentropic efficiency data provided by the compressor performance map. Improvements are conducted on a widely used compressor isentropic efficiency model that the "specific enthalpy change-mass flow rate" plane is divided into several zones according to the existing iso-speed lines in the compressor performance map and the model is parameterized with the sample data of the upper and lower iso-speed lines within each zone. The simulation results reveal that the prediction accuracy of zonal isentropic efficiency model improves compared with the original model, the corrected coefficient of determination increases from 0.967 5 to 0.985 8, the maximum absolute relative error decreases from 6.796 7% to 2.553 5%, the mean absolute percentage error decreases from 0.903 8% to 0.642 8%. In addition, the zonal isentropic efficiency model is able to extrapolate to off-design zones reasonably and robustly, the mean absolute percentage error is only 0.842 2% when extrapolating to high-speed zone and it is 2.031 8% when extrapolating to low-speed. Due to the compact structure and fast calculation speed of the zonal isentropic efficiency model as well as superior prediction accuracy and extrapolation ability, it can be applied to the research fields such as model-based control and fault diagnosis.

关 键 词：压气机 等熵效率 分区域建模 热传递 EULER公式 

分 类 号：TK422.2[动力工程及工程热物理—动力机械及工程] U664.12[交通运输工程—船舶及航道工程]