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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第7期    总第299期    2019年7月

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文章编号:1672-7207(2019)07-1719-10
一种用于内燃机排气能量回收的新型布雷顿循环系统
周峰1,付建勤1, 2,刘敬平1,唐琦军1,朱国辉1

(1. 湖南大学 汽车车身先进设计制造国家重点实验室,湖南 长沙,410082;
2. 重庆大学 低品位能源利用技术及系统教育部重点实验室,重庆,400044
)

摘 要: 为回收涡轮增压内燃机排气(IC)能量,提出一种新型布雷顿循环系统:在增压系统耦合1个高速电机作为布雷顿循环负载,回收涡轮功率;将内燃机视为布雷顿循环的燃烧器,通过改变其运行参数来调节布雷顿循环工质状态和参数。以某增压柴油机为研究对象,根据试验数据建立并标定循环系统的GT-Power仿真模型。研究不同转速下涡轮旁通阀开度、进气压力和循环喷油量对布雷顿循环性能参数的影响。研究结果表明:该布雷顿循环可以有效回收排气能量;涡前流量、压力和温度与布雷顿循环输出功率及热效率呈正相关;随进气压力增大,布雷顿循环功率和效率先增大后减小;循环喷油量增大,布雷顿循环输出功率和效率均增大,但系统总效率下降;当转速为3 400 r/min时,最大输出功率为18.30 kW,最大循环热效率为9.51%;系统总热效率相对于原机提高5.74%。

 

关键词: 内燃机;布雷顿循环;余热回收;热效率;节能

A new Brayton cycle used for energy recovery of IC engine exhaust gas
ZHOU Feng1, FU Jianqin1, 2, LIU Jingping1, TANG Qijun1, ZHU Guohui1

1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;
2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China

Abstract:In order to recover the exhaust gas energy of turbocharged engine, a new Brayton cycle was proposed. A high-speed motor was coupled to turbocharged system and serves as the load of Brayton cycle, which was used to recover the turbine power. The engine was taken as the burner of Brayton cycle, and its working parameters determined the working medium states of Brayton cycle. Taking a turbocharged diesel engine as the research object, the GT-Power simulation model of the cycle system was built and calibrated according to experimental results. On this basis, the influences of various parameters such as turbine by-pass valve opening, intake pressure and fuel-injection quality on the performance parameters of Brayton cycle were analyzed. The results show that the new Brayton cycle can effectively recover engine exhaust gas energy. The mass flow rate, pressure and temperature of gas are positively correlated with Brayton cycle output power and thermal efficiency. With the increase of intake pressure, Brayton cycle output power and efficiency first increase and then decrease. With the increase of fuel-injection quality, both the Brayton cycle outputpower and efficiency increase, but the total efficiency of cycle system decreases. At 3 400 r/min, the maximum output power of Brayton cycle reaches 18.30 kW, the maximum cycle thermal efficiency comes up to 9.51%, and the total thermal efficiency increases by 5.74% on the basis of original engine.

 

Key words: intelnal combustion(IC) engine; Brayton cycle; waste heat recovery; thermal efficiency; energy conservation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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