scholarly journals Effects of hydrogen addition on engine performance in a spark ignition engine with a high compression ratio under lean burn conditions

2019 ◽  
Vol 44 (29) ◽  
pp. 15565-15574 ◽  
Author(s):  
Masaki Naruke ◽  
Kohei Morie ◽  
Satoshi Sakaida ◽  
Kotaro Tanaka ◽  
Mitsuru Konno
Keyword(s):  
Compression Ratio ◽  
Engine Performance ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
High Compression Ratio ◽  
Lean Burn ◽  
Hydrogen Addition ◽  
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.

Direct Injection of CNG on High Compression Ratio Spark Ignition Engine: Numerical and Experimental Investigation

2011 ◽  
Author(s):  
Benoit Douailler ◽  
Frederic Ravet ◽  
Vivien Delpech ◽  
Dominique Soleri ◽  
Benjamin Reveille ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Compression Ratio ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
High Compression Ratio ◽  
High Compression

scholarly journals Experimental analysis of super-knock occurrence based on a spark ignition engine with high compression ratio

Energy ◽  
2018 ◽  
Vol 165 ◽  
pp. 68-75 ◽  
Author(s):  
Lei Zhou ◽  
Rui Kang ◽  
Haiqiao Wei ◽  
Dengquan Feng ◽  
Jianxiong Hua ◽  
...  
Keyword(s):  
Compression Ratio ◽  
Experimental Analysis ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
High Compression Ratio ◽  
High Compression

Operation of a Spark Ignition Engine With High Compression Ratio Using Biogas Blended With Natural Gas, Propane, and Hydrogen

2018 ◽  
Vol 141 (5) ◽  
Author(s):  
Juan Pablo Gómez Montoya ◽  
Andrés A. Amell ◽  
Daniel B. Olsen
Keyword(s):  
Natural Gas ◽  
Output Power ◽  
Compression Ratio ◽  
Maximum Output Power ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Maximum Output ◽  
High Compression Ratio ◽  
Operational Conditions ◽  
High Compression

This research evaluated the operational conditions for a diesel engine with high compression ratio (CR) converted to spark ignition (SI), under stable combustion conditions close to the knocking threshold. The main fuel used in the engine was biogas, which was blended with natural gas, propane, and hydrogen. The engine limit to test the maximum output power was using the knocking threshold; just below the knocking threshold, the output power and generating efficiency are the highest for each blend. Leaner mixtures increased the engine knocking tendency because the required increase in the % throttle reduced the pressure drop at the inlet stroke and increased the mixture pressure at the end of the compression stroke, which finally reduced the ignition delay time of the end gas and increased the knocking tendency of the engine for all the blends. Therefore, the output power should be decreased to operate the engine below to the knocking threshold. Purified biogas achieved the highest output power and generating efficiency compared with the other blends and the original diesel operation; this blend was operated with five equivalence ratios. Purified biogas exhibits an optimal balance between knocking resistance, low heating value, flame speed, and energy density.

scholarly journals Experimental Investigation of Diluents Components on Performance and Emissions of a High Compression Ratio Methanol SI Engine

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3366
Author(s):  
You Zhou ◽  
Wei Hong ◽  
Ye Yang ◽  
Xiaoping Li ◽  
Fangxi Xie ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Specific Heat ◽  
Compression Ratio ◽  
Combustion Process ◽  
Spark Ignition ◽  
Chemical Effect ◽  
High Compression Ratio ◽  
Lean Burn ◽  
High Compression ◽  
Wide Range

Increasing compression ratio and using lean burn are two effective techniques for improving engine performance. Methanol has a wide range of sources and is a kind of suitable fuel for a high-compression ratio spark-ignition lean burn engine. Lean burn mainly has a dilution effect, thermal effect and chemical effect. To clarify the influences of different effects and provide guidance for improving composition of dilution gases and applications of this technology, this paper chose Ar, N2 and CO2 as diluents. A spark-ignition methanol engine modified from a diesel engine with a compression ratio of 17.5 was used for the experiments. The results obtained by using methanol spark ignition combustion indicated that at engine speed of 1400 rpm and 25% load, NOx dropped by up to 77.5%, 100% and 100% by Ar, CO2 and N2. Gases with higher specific heat ratio and lower heat capacity represented by Ar exhibited the least adverse effect on combustion and showed a downward break-specific fuel consumption (BSFC) trend. Gas with high specific heat capacity represented by CO2 can decrease NOx and total hydro carbons (THC) emissions at the same time, but the BSFC of CO2 showed the worst trend, followed by N2. Gas affecting the combustion process like CO2 had chemical effect.

Sign in / Sign up

Export Citation Format

Share Document