天津大学学报
天津大學學報
천진대학학보
JOURNAL OF TIANJIN UNIVERSITY SCIENCE AND TECHNOLOGY
2015年
4期
328-333
,共6页
姚春德%潘望%魏立江%刘军恒%王全刚%余海涛
姚春德%潘望%魏立江%劉軍恆%王全剛%餘海濤
요춘덕%반망%위립강%류군항%왕전강%여해도
进气温度%二元燃料燃烧%甲醇%燃烧特性%碳烟排放
進氣溫度%二元燃料燃燒%甲醇%燃燒特性%碳煙排放
진기온도%이원연료연소%갑순%연소특성%탄연배방
intake air temperature%dual fuel combustion%methanol%combustion characteristics%soot emission
在一台电控单体泵增压中冷发动机上,研究在固定柴油和甲醇供给时刻和供给量条件下,进气温度变化对柴油甲醇二元燃料燃烧特性的影响。结果表明:相同工况下,进气温度从40,℃变化到70,℃可以使爆发压力相差4,MPa,着火时刻相差15°,CA;进气温度的升高,不仅会造成滞燃期缩短、最大爆发压力和压力升高率增大,而且最大爆发压力出现的时刻变早、燃烧相位前移;在部分工况,变化进气温度还伴随燃烧模式的转变。温度变化还表现出柴油甲醇二元燃料燃烧和发动机转速的极大关联:在低速、较大负荷时,进气温度升高会导致输出扭矩下降和当量比油耗升高;在高速时,进气温度升高能提高输出扭矩并降低当量比油耗,但过高的进气温度会使大量甲醇在上止点之前燃烧,降低输出扭矩并提高当量比油耗。进气温度对碳烟排放也有较大影响:随进气温度降低,碳烟排放降低。综合研究结果表明,柴油甲醇二元燃料燃烧进气温度控制在50~70,℃时,可以获得最佳的经济和排放性能。
在一檯電控單體泵增壓中冷髮動機上,研究在固定柴油和甲醇供給時刻和供給量條件下,進氣溫度變化對柴油甲醇二元燃料燃燒特性的影響。結果錶明:相同工況下,進氣溫度從40,℃變化到70,℃可以使爆髮壓力相差4,MPa,著火時刻相差15°,CA;進氣溫度的升高,不僅會造成滯燃期縮短、最大爆髮壓力和壓力升高率增大,而且最大爆髮壓力齣現的時刻變早、燃燒相位前移;在部分工況,變化進氣溫度還伴隨燃燒模式的轉變。溫度變化還錶現齣柴油甲醇二元燃料燃燒和髮動機轉速的極大關聯:在低速、較大負荷時,進氣溫度升高會導緻輸齣扭矩下降和噹量比油耗升高;在高速時,進氣溫度升高能提高輸齣扭矩併降低噹量比油耗,但過高的進氣溫度會使大量甲醇在上止點之前燃燒,降低輸齣扭矩併提高噹量比油耗。進氣溫度對碳煙排放也有較大影響:隨進氣溫度降低,碳煙排放降低。綜閤研究結果錶明,柴油甲醇二元燃料燃燒進氣溫度控製在50~70,℃時,可以穫得最佳的經濟和排放性能。
재일태전공단체빙증압중랭발동궤상,연구재고정시유화갑순공급시각화공급량조건하,진기온도변화대시유갑순이원연료연소특성적영향。결과표명:상동공황하,진기온도종40,℃변화도70,℃가이사폭발압력상차4,MPa,착화시각상차15°,CA;진기온도적승고,불부회조성체연기축단、최대폭발압력화압력승고솔증대,이차최대폭발압력출현적시각변조、연소상위전이;재부분공황,변화진기온도환반수연소모식적전변。온도변화환표현출시유갑순이원연료연소화발동궤전속적겁대관련:재저속、교대부하시,진기온도승고회도치수출뉴구하강화당량비유모승고;재고속시,진기온도승고능제고수출뉴구병강저당량비유모,단과고적진기온도회사대량갑순재상지점지전연소,강저수출뉴구병제고당량비유모。진기온도대탄연배방야유교대영향:수진기온도강저,탄연배방강저。종합연구결과표명,시유갑순이원연료연소진기온도공제재50~70,℃시,가이획득최가적경제화배방성능。
Effect of intake air temperature on combustion and soot emission of a compression ignition engine operated on diesel-methanol dual fuel(DMDF)was investigated. The results show that increasing the intake air temperature would increase peak pressure and shorten the ignition delay. The centre of the premixed heat release curve was closer to the top-dead-center with the increase of the intake air temperature. For a specific operation point,the brake pres-sure increased by 4,MPa and ignition was delayed by15°,CA with intake air temperature changes from 40,℃ to 70,℃. The engine power and specific fuel consumption experienced a slight variation with the increase of the intake tempera-ture. The specific fuel consumption decreased and the output torque increased with the increase of the intake air tem-perature at high speed. The specific fuel consumption increased and the output torque decreased with the increase of intake air temperature at low speed and high load. This would be due to the change of combustion characteristics. The soot emission decreased with the decreasing of intake air temperature. It is proved that DMDF holds the best combus-tion and emission characteristics when the intake air temperature is fixed between 50—70,℃.