本文選題：內(nèi)燃機 + 柴油機�。� 參考：《內(nèi)燃機工程》2016年06期

【摘要】：為了研究可變噴嘴渦輪(VNT)技術(shù)對降低柴油機NO_x排放的作用,首先對帶排氣旁通閥渦輪增壓器(WG)和文丘里管高壓廢氣再循環(huán)(vEGR)的WG-vEGR渦輪增壓柴油機原機,運用GT-Power軟件和AVL FIRE軟件進行VNT的匹配,對柴油機綜合性能進行了仿真計算,確定歐洲穩(wěn)態(tài)測試循環(huán)(ESC)工況最優(yōu)VNT開度規(guī)律,組成VNT-vEGR柴油機。隨后對WG-vEGR柴油機和VNT-vEGR柴油機進行了ESC工況臺架試驗研究。研究結(jié)果表明:VNT能夠提高柴油機的廢氣再循環(huán)(EGR)率,VNT-vEGR柴油機的ESC工況加權(quán)NO_x排放值為3.53g/(kW·h),與WG-vEGR柴油機原機的4.92g/(kW·h)相比,下降約28.25%;ESC工況加權(quán)比油耗為232.1g/(kW·h),相比于WG-vEGR柴油機原機的235.5g/(kW·h),降低約1.44%;ESC工況加權(quán)碳煙排放值為0.055g/(kW·h),相比于WG-vEGR柴油機原機的0.058g/(kW·h),降低約5.17%。且從加權(quán)比油耗和碳煙排放值的變化情況可以看出,該系統(tǒng)具有采用更大EGR率以獲得NO_x排放進一步優(yōu)化的潛力。
[Abstract]:In order to study the effect of variable nozzle turbine (VNT) technology on reducing NO_x emission of diesel engine, the original engine of WG-vEGR turbocharged diesel engine with exhaust bypass valve turbocharger (WGG) and Venturi tube high pressure exhaust gas recirculation (VEGR) was first studied. By using GT-Power and AVL FIRE software to match VNT, the comprehensive performance of diesel engine is simulated and calculated, and the optimal VNT opening law of European steady-state test cycle is determined. The VNT-vEGR diesel engine is composed of VNT-vEGR diesel engine. Then the WG-vEGR diesel engine and the VNT-vEGR diesel engine were tested on the bench under the ESC condition. The results show that the weight NO_x emission value of VNT-vEGR diesel engine under ESC condition is 3.53g/(kW hu, which is higher than that of WG-vEGR diesel engine, compared with that of WG-vEGR diesel engine, which can increase the exhaust gas recirculation rate of VNT-VEGR diesel engine and the weighted NO_x emission value of VNT-vEGR diesel engine. Compared with the original WG-vEGR diesel engine, the fuel consumption is reduced by 28.25%, compared with that of the original WG-vEGR diesel engine, the weighted soot emission value is about 1.44% 0.055g/(kW hu, and 5.17% lower than that of the WG-vEGR diesel engine. It can be seen from the change of fuel consumption and soot emission value of weighted ratio that the system has the potential to adopt larger EGR rate to obtain further optimization of NO_x emissions.
【作者單位】： 同濟大學汽車學院;
【基金】：國家自然科學基金項目(51106114) 教育部高等學校博士學科點專項科研基金項目(20110072120002)
【分類號】：TK421.5

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