Abstract
Partially premixed combustion (PPC) is a low temperature combustion (LTC) concept which can relieve soot-NO x trade-off without sacrificing efficiency. However, at low load operating range, PPC with low reactivity fuel generally undergoes long ignition delay, which gives rise to high pressure rise rate, fast heat release and even misfires. To solve these problems and maintain high efficiency simultaneously, inlet heating, inlet boosting and double-injection strategy are experimentally investigated in a heavy-duty engine. BH80 (80vol% n-butanol and 20vol% n-heptane) are blended and tested at 8 bar gIMEP in PPC mode. Inlet heating (from 40 o C to 100 o C), inlet boosting (from 1.4 bar to 2.5 bar) and a double-injection strategy (pilot/main injection) are attempted to reduce the maximum pressure rise rate (PRRmax). The results show that all three methods can achieve negligible soot emissions. Moreover, a correlation between global temperature at TDC and ignition delay is noticed. In other words, high global temperature after compression stroke makes BH80 easier to ignite. As a consequence, the ignition delay shortens and the maximum pressure rise rate decreases. Compared to inlet heating and inlet boosting, the double-injection strategy shows more advantages in reducing pressure rise rates and obtaining high gross indicated efficiency (GIE). Specifically, with a well-tuned double-injection strategy, 3.6 bar/ o CA PRRmax and 49.5% GIE are achieved. In addition, when more fuel is injected in the pilot injection pulse, NO x emissions are significantly decreased. However, a longer pilot pulse also produces more CO and HC emissions and leads to lower combustion efficiency.
| Original language | English |
|---|---|
| Article number | 2019-01-1149 |
| Number of pages | 12 |
| Journal | SAE Technical Papers |
| Volume | 2019 |
| DOIs | |
| Publication status | Published - 2 Apr 2019 |
| Event | SAE World Congress Experience, WCX 2019 - Cobo Hall, Detroit, United States Duration: 9 Apr 2019 → 11 Apr 2019 https://www.sae.org/attend/wcx/ |
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Comparative study on the effects of inlet heating, inlet boosting, and double-injection strategy on partially premixed combustion. / Han, Jinlin (Corresponding author); Wang, Shuli; Somers, Bart.
In: SAE Technical Papers, Vol. 2019, 2019-01-1149, 02.04.2019.Research output: Contribution to journal › Conference article › Academic › peer-review
TY - JOUR
T1 - Comparative study on the effects of inlet heating, inlet boosting, and double-injection strategy on partially premixed combustion
AU - Han, Jinlin
AU - Wang, Shuli
AU - Somers, Bart
PY - 2019/4/2
Y1 - 2019/4/2
N2 - Partially premixed combustion (PPC) is a low temperature combustion (LTC) concept which can relieve soot-NO x trade-off without sacrificing efficiency. However, at low load operating range, PPC with low reactivity fuel generally undergoes long ignition delay, which gives rise to high pressure rise rate, fast heat release and even misfires. To solve these problems and maintain high efficiency simultaneously, inlet heating, inlet boosting and double-injection strategy are experimentally investigated in a heavy-duty engine. BH80 (80vol% n-butanol and 20vol% n-heptane) are blended and tested at 8 bar gIMEP in PPC mode. Inlet heating (from 40 o C to 100 o C), inlet boosting (from 1.4 bar to 2.5 bar) and a double-injection strategy (pilot/main injection) are attempted to reduce the maximum pressure rise rate (PRRmax). The results show that all three methods can achieve negligible soot emissions. Moreover, a correlation between global temperature at TDC and ignition delay is noticed. In other words, high global temperature after compression stroke makes BH80 easier to ignite. As a consequence, the ignition delay shortens and the maximum pressure rise rate decreases. Compared to inlet heating and inlet boosting, the double-injection strategy shows more advantages in reducing pressure rise rates and obtaining high gross indicated efficiency (GIE). Specifically, with a well-tuned double-injection strategy, 3.6 bar/ o CA PRRmax and 49.5% GIE are achieved. In addition, when more fuel is injected in the pilot injection pulse, NO x emissions are significantly decreased. However, a longer pilot pulse also produces more CO and HC emissions and leads to lower combustion efficiency.
AB - Partially premixed combustion (PPC) is a low temperature combustion (LTC) concept which can relieve soot-NO x trade-off without sacrificing efficiency. However, at low load operating range, PPC with low reactivity fuel generally undergoes long ignition delay, which gives rise to high pressure rise rate, fast heat release and even misfires. To solve these problems and maintain high efficiency simultaneously, inlet heating, inlet boosting and double-injection strategy are experimentally investigated in a heavy-duty engine. BH80 (80vol% n-butanol and 20vol% n-heptane) are blended and tested at 8 bar gIMEP in PPC mode. Inlet heating (from 40 o C to 100 o C), inlet boosting (from 1.4 bar to 2.5 bar) and a double-injection strategy (pilot/main injection) are attempted to reduce the maximum pressure rise rate (PRRmax). The results show that all three methods can achieve negligible soot emissions. Moreover, a correlation between global temperature at TDC and ignition delay is noticed. In other words, high global temperature after compression stroke makes BH80 easier to ignite. As a consequence, the ignition delay shortens and the maximum pressure rise rate decreases. Compared to inlet heating and inlet boosting, the double-injection strategy shows more advantages in reducing pressure rise rates and obtaining high gross indicated efficiency (GIE). Specifically, with a well-tuned double-injection strategy, 3.6 bar/ o CA PRRmax and 49.5% GIE are achieved. In addition, when more fuel is injected in the pilot injection pulse, NO x emissions are significantly decreased. However, a longer pilot pulse also produces more CO and HC emissions and leads to lower combustion efficiency.
UR - http://www.scopus.com/inward/record.url?scp=85064628382&partnerID=8YFLogxK
U2 - 10.4271/2019-01-1149
DO - 10.4271/2019-01-1149
M3 - Conference article
AN - SCOPUS:85064628382
VL - 2019
JO - SAE Technical Papers
JF - SAE Technical Papers
SN - 0148-7191
M1 - 2019-01-1149
ER -