回热型SCO_(2)布雷顿循环及压气机设计

Regenerative SCO_(2) Brayton Cycle and Compressor Design

为了解决船舶、飞行器等动力装置的持续供电问题,选定超临界二氧化碳(SCO_(2))布雷顿循环作为动力来源。用Aspen plus软件对简单型、回热型和再压缩型SCO_(2)布雷顿循环进行分析,根据设计工况下循环的热效率和功率以及循环系统的重量,最终选择回热型SCO_(2)布雷顿循环作为动力装置的供电循环。对回热循环进行分析,分析结果表明:在回热循环中随着压气机、涡轮效率增大,循环的热效率和循环功率也增大。压气机出口压力对循环热效率的影响可以近似为线性,涡轮入口温度对循环热效率几乎没有影响。换热器温度对效率的影响大于压力对效率的影响并且换热器对循环功率几乎没有影响。在确定回热循环压气机工况参数后,利用Concepts NREC COMPAL软件和CFX软件分别对回热循环的压气机进行了一维设计和三维计算,设计出了等熵效率能够达到90.53%的单级离心压气机。

In order to solve the problem of continuous power supply for power devices such as ships and aircraft,the supercritical carbon dioxide(SCO_(2))Brayton cycle was selected as the power source.Using Aspen plus software to analyze the simple,regenerative,and recompression SCO_(2) Brayton cycles,based on the thermal efficiency and power of the cycle under design conditions,as well as the weight of the cycle system,the regenerative SCO_(2) Brayton cycle was ultimately selected as the power supply cycle for the power plant.By analyzing the regenerative cycle,results show that the thermal efficiency and cycle power of the cycle increase with the increase of compressor and turbine efficiency in the regenerative cycle.The effect of compressor outlet pressure on cycle thermal efficiency can be approximately linear,while the turbine inlet temperature has almost no effect on cycle thermal efficiency.The effect of heat exchanger temperature on efficiency is greater than that of pressure,and the heat exchanger has almost no effect on cycle power.After determining the operating parameters of the regenerative cycle compressor,Concepts NREC COMPAL and CFX softwares are used to perform one⁃dimensional and three⁃dimensional calculations on the compressor of the regenerative cycle,and a single stage centrifugal compressor with an isen⁃tropic efficiency of 90.53%is designed.