scholarly journals Thermal efficiency improvement of lean burn high compression ratio engine coupled with water direct injection

2021 ◽  
pp. 114969
Author(s):  
Yiqiang Pei ◽  
Qirui Zhang ◽  
Zhong Peng ◽  
Yanzhao An ◽  
Hao Shi ◽  
...  
Keyword(s):  
Compression Ratio ◽  
Thermal Efficiency ◽  
Direct Injection ◽  
Efficiency Improvement ◽  
High Compression Ratio ◽  
Lean Burn ◽  
High Compression

Limits of compression ratio in spark-ignition combustion with methanol

2021 ◽  
pp. 146808742110433
Author(s):  
Christian Wouters ◽  
Patrick Burkardt ◽  
Stefan Pischinger
Keyword(s):  
Compression Ratio ◽  
Direct Injection ◽  
Spark Ignition ◽  
Combustion Stability ◽  
High Compression Ratio ◽  
Lean Burn ◽  
Promising Alternative ◽  
Excess Air ◽  
High Compression ◽  
Lean Limit

A shift toward a circular and [Formula: see text]-neutral world is required, in which rapid defossilization and lower emissions are realized. A promising alternative fuel that has gained traction is methanol, thanks to its favorable and clean-burning fuel properties as well as its ability to be produced in a carbon-neutral process. Especially methanol’s high knock resistance and its combustion stability offer the opportunity to operate an engine at both a high compression ratio and a high excess air dilution. Although methanol has been investigated in series-production engines for passenger car applications, there is a lack of investigations on a dedicated engine that can operate at methanol’s knock limit. In this paper, methanol’s knock limitation is experimentally assessed by applying high compression ratios to a direct injection spark-ignition single-cylinder research engine. To that end, four compression ratios were investigated: 10.8, 15.0, 17.7, and 20.6. With compression ratios of 15.0 and 17.7, the lean-limit was increased to excess air ratios of 2.0 and 2.1, respectively, compared to 1.7 at a compression ratio of 10.8. For the highest compression ratio of 20.6, the maximum lean burn limit was increased to an excess air ratio of 1.9 due to achieving the maximum cylinder pressure limit. Despite the minor increase in lean-limit, a maximum indicated efficiency of 48.7% was achieved with the highest compression ratio of 20.6. However, even at this high compression ratio, methanol did not show a knock limitation. The investigations in this work provide profound knowledge for future engine investigations with methanol.

Experimental study of knock combustion and direct injection on knock suppression in a high compression ratio methanol engine

Fuel ◽  
2021 ◽  
pp. 122505
Author(s):  
Qimeng Duan ◽  
Xiaojun Yin ◽  
Xiaochen Wang ◽  
Hailiang Kou ◽  
Ke Zeng
Keyword(s):  
Experimental Study ◽  
Compression Ratio ◽  
Direct Injection ◽  
High Compression Ratio ◽  
High Compression

Optimization on timings of injection and spark of a high compression-ratio stratified-charge methanol engine under ultra-lean burn

Fuel ◽  
2021 ◽  
Vol 285 ◽  
pp. 119227 ◽  
Author(s):  
Changming Gong ◽  
Zilei Zhang ◽  
Jingzhen Sun ◽  
Fenghua Liu
Keyword(s):  
Compression Ratio ◽  
High Compression Ratio ◽  
Lean Burn ◽  
Stratified Charge ◽  
High Compression

Improvement of Thermal Efficiency and NOx Emissions by High Compression Ratio Combustion in a DI Diesel Engine

2004 ◽  
Vol 2004.3 (0) ◽  
pp. 131-132
Author(s):  
Yusuke NAKAHIRA ◽  
Takashi OZAWA ◽  
Hidekatsu TSUTSUMI ◽  
Masahiro ONODERA ◽  
Koji IMOTO
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Thermal Efficiency ◽  
Nox Emissions ◽  
High Compression Ratio ◽  
High Compression ◽  
Di Diesel Engine
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