单向阀对双增压气路中气体流向影响的分析与研究.pdf

第48卷第6期
机械工程学报
Vo1.48No.6
2012年3月
JOURNAL OF MECHANICAL ENGINEERING
Mar
2012
DOIe10.390I/JMIE.2012.06.124
单向阀对双增压气路中气体流向影响的分析与研究”
姚春德韩伟强1武炎侯亚都徐成耀2路平
(1.天津大学内燃机燃烧学国家重点实验室天津30002;
2.天大龙成节能环保科技有限公司常州213168
摘要:搭建由双电动增压器与单向网组成的试验台架并模拟研究单向阀对双增压气路中气体流向的影响规律,以提高电动增
压器的补气效率,从而增大公交车柴油机工况突变时的进气量,改善瞬态烟度。通过向两个电动增压器设定不同的转速,分
别模拟公交车柴油机的废气涡轮增压器和附加用于急加速补气的电动增压器,研究并分析在气路上设置单向阀前后对双增压
气路中气体流向的影响。试验结果表明,电动增压器的流量大于废气涡轮增压器的流量时,出口总流量在无单向阀时大致等
于废气涡轮增压器提供的流量,增加电动增压器的流量不会改变出口总流量,电动増压器补气效率低,柴油机的进气量未得
到改善。有单向阀时,出口总流量随电动增压器流量增加而增大,电动增压器补气效率高,柴油机的进气量增大;电动增压
器的流量小于废气涡轮增压器的流量时,电动增压器与单向阀不影响出口总流量,出口总流量与有旁通气路无单向阀时相,
即电动增压器不工作时不影响原机的进气量。
关键词:双电动增压气路气体流向单向阀
中图分类号:TK423
Research and Analysis on the Air Flow Direction Affected by Check Valve
in Pressurization Gas Path of Two Electric Superchargers
YAO Chunde HAN Weiqiang WU Yan HOU Yabang XU Chengyao LU Ping
(1. State Key Laboratory of Engine, Tianjin University, Tianjin 3000
2. Tian Da Long Cheng Energy Conservation Technology Co, Ltd, Changzhou 213168
Abstract: A testing rig, consisting of two electric superchargers and a check valve, used to simulate and investigate the air flow
direction affected by check valve in pressurization gas path is built. Through this way higher fill gas efficiency of electric
supercharger can be achieved, which will give rise to more air inflow of diesel engine at its working condition mutation, improving
transient FSN. By setting the speed of the two electric Superchargers respectively, one is used to simulate the turbocharger of the
diesel engine of a bus and the other is used to simulate electric supercharger which supplys additional air for a sharp acceleration, to
study the air flow direction affected by check valve in pressurization gas path. Testing results indicate that without the check valv
when the flow rate of the electric supercharger is larger than that of the turbocharger, the total flow rate is equal to that of the
turbocharger, and it will not increase while increasing fiow rate of the supercharger, for the fill gas efficiency of the electric
supercharger is low and air inflow is not increased With the check valve, the o al low rate will increase while increasing flow rate of
the supercharger, for higher fill gas efficiency of the electric supercharger is achieved and air inflow is increased. When the flow rate
of the electric supercharger is smaller than that of the turbocharger, the total flow rate will not be affected by the electric supercharger
while using the check valve and a by-pass comparing to the total flow rate while using a by-pass only, which means the air inflow
will not be decreased by the electric supercharger when it stops
Key words: Pressurizing gas path consists of two electric superchargers Gas flow direction Check valve
源。柴油机在低速恒负载加速时,废气涡轮增压器
0前
的动态响应差,不能提供柴油机在特定燃油消耗率
下所需要的空气质量流量叫,导致公交车在加速时
现有公交车多采用增压中冷柴油机作为动力会产生黑烟,燃料不能完全燃烧。不仅污染环境
而且造成能源浪费2。
本天津市科技支掉计划资助项目(08 ZCGYSFO0900。20110811收到初稿,
电动增压器具有响应快、结构简单、增压器的
20120110收到修改稿