Laboratory Engine Test for Two-Cycle, Spark Ignition Gas Engine Lubricants

1966 ◽  
Author(s):  
W. D. Dysart
Keyword(s):  
Spark Ignition ◽  
Engine Test ◽  
Gas Engine

Assessment of Turbulent Combustion Models for Simulating Pre-Chamber Ignition in a Natural Gas Engine

2021 ◽  
Author(s):  
Joohan Kim ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
Ashish Shah ◽  
Munidhar Biruduganti ◽  
...  
Keyword(s):  
Natural Gas ◽  
Turbulent Combustion ◽  
High Efficiency ◽  
Turbulent Flame ◽  
Spark Ignition ◽  
Cylinder Wall ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Models ◽  
Combustion Processes

Abstract Lean combustion in an internal combustion engine is a promising strategy to increase thermal efficiency by leveraging a more favorable specific heat ratio of the fresh mixture and simultaneously suppressing the heat losses to the cylinder wall. However, unstable ignition events and slow flame propagation at fuel-lean condition lead to high cycle-to-cycle variability and hence limit the high-efficiency engine operating range. Pre-chamber ignition is considered an effective concept to extend the lean operating limit, by providing spatially distributed ignition with multiple turbulent flame-jets and enabling faster combustion rate compared to the conventional spark ignition approach. From a numerical modeling perspective, to date, still the science base and available simulation tools are inadequate for understanding and predicting the combustion processes in pre-chamber ignited engines. In this paper, conceptually different RANS combustion models widely adopted in the engine modeling community were used to simulate the ignition and combustion processes in a medium-duty natural gas engine with a pre-chamber spark-ignition system. A flamelet-based turbulent combustion model, i.e., G-equation, and a multi-zone well-stirred reactor model were employed for the multi-dimensional study. Simulation results were compared with experimental data in terms of in-cylinder pressure and heat release rate. Finally, the analysis of the performance of the two models is carried out to highlight the strengths and limitations of the two formulations respectively.

Assessment of Turbulent Combustion Models for Simulating Pre-Chamber Ignition in a Natural Gas Engine

2019 ◽  
Author(s):  
Joohan Kim ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
Ashish Shah ◽  
Munidhar S. Biruduganti ◽  
...  
Keyword(s):  
Natural Gas ◽  
Turbulent Combustion ◽  
High Efficiency ◽  
Turbulent Flame ◽  
Spark Ignition ◽  
Cylinder Wall ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Models ◽  
Combustion Processes

Abstract Lean combustion in an internal combustion engine is a promising strategy to increase thermal efficiency by leveraging a more favorable specific heat ratio of the fresh mixture and simultaneously suppressing the heat losses to the cylinder wall. However, unstable ignition events and slow flame propagation at fuel-lean condition lead to high cycle-to-cycle variability and hence limit the high-efficiency engine operating range. Pre-chamber ignition is considered an effective concept to extend the lean operating limit, by providing spatially distributed ignition with multiple turbulent flame-jets and enabling faster combustion rate compared to the conventional spark ignition approach. From a numerical modeling perspective, to date, still the science base and available simulation tools are inadequate for understanding and predicting the combustion processes in pre-chamber ignited engines. In this paper, conceptually different RANS combustion models widely adopted in the engine modeling community were used to simulate the ignition and combustion processes in a medium-duty natural gas engine with a pre-chamber spark-ignition system. A flamelet-based turbulent combustion model, i.e., G-equation, and a multi-zone well-stirred reactor model were employed for the multi-dimensional study. Simulation results were compared with experimental data in terms of in-cylinder pressure and heat release rate. Finally, the analysis of the performance of the two models is carried out to highlight the strengths and limitations of the two formulations respectively.

Development of the Control and Acquisition System for a Natural-Gas Spark-Ignition Engine Test Bench

2019 ◽  
Author(s):  
Lorenzo Gasbarro ◽  
Jinlong Liu ◽  
Christopher Ulishney ◽  
Cosmin E. Dumitrescu ◽  
Luca Ambrogi ◽  
...  
Keyword(s):  
Natural Gas ◽  
Internal Combustion Engines ◽  
Test Bench ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Acquisition System ◽  
Combustion Engines ◽  
Engine Test ◽  
New Sensors

Abstract Investigations using laboratory test benches are the most common way to find the technological solutions that will increase the efficiency of internal combustion engines and curtail their emissions. In addition, the collected experimental data are used by the CFD community to develop engine models that reduce the time-to-market. This paper describes the steps made to increase the reliability of engine experiments performed in a heavy-duty natural-gas spark-ignition engine test-cell such as the design of the control and data acquisition system based on Modbus TCP communication protocol. Specifically, new sensors and a new dynamometer controller were installed. The operation of the improved test bench was investigated at several operating conditions, with data obtained at both high- and low-sampling rates. The results indicated a stable test bench operation.

Catalyst light-off behavior of a spark-ignition LPG (liquefied petroleum gas) engine during cold start

Energy ◽  
2011 ◽  
Vol 36 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Changming Gong ◽  
Kuo Huang ◽  
Baoqing Deng ◽  
Xunjun Liu
Keyword(s):  
Cold Start ◽  
Spark Ignition ◽  
Liquefied Petroleum Gas ◽  
Gas Engine

scholarly journals Performance Improvements in a Spark Ignition Gas Engine with Longer Strokes(Thermal Engineering)

2010 ◽  
Vol 76 (765) ◽  
pp. 852-858 ◽  
Author(s):  
Hideyuki OGAWA ◽  
Keisuke KIMURA ◽  
Keisuke SASAKI ◽  
Yuki SATO ◽  
Takahiro SAKO
Keyword(s):  
Spark Ignition ◽  
Thermal Engineering ◽  
Gas Engine ◽  
Performance Improvements

Laser Ignition of Natural Gas Engines Using Fiber Delivery

2005 ◽  
Author(s):  
Azer P. Yalin ◽  
Morgan W. Defoort ◽  
Sachin Joshi ◽  
Daniel Olsen ◽  
Bryan Willson ◽  
...  
Keyword(s):  
Natural Gas ◽  
Past Research ◽  
Spark Ignition ◽  
Laser Source ◽  
Laser Ignition ◽  
Ignition System ◽  
Gas Engine ◽  
Natural Gas Engines ◽  
Natural Gas Engine ◽  
Design Concepts

A practical impediment to implementation of laser ignition systems has been the open-path beam delivery used in past research. In this contribution, we present the development and implementation of a fiber-optically delivery laser spark ignition system. To our knowledge, the work represents the first demonstration of fiber coupled laser ignition (using a remote laser source) of a natural gas engine. A Nd:YAG laser is used as the energy source and a coated hollow fiber is used for beam energy delivery. The system was implemented on a single-cylinder of a Waukesha VGF 18 turbo charged natural gas engine and yielded consistent and reliable ignition. In addition to presenting the design and testing of the fiber delivered laser ignition system, we present initial design concepts for a multiplexer to ignite multiple cylinders using a single laser source, and integrated optical diagnostic approaches to monitor the spark ignition and combustion performance.

The Effect of the Method of Gas Admission on Performance of a Spark-Ignition Gas Engine

1970 ◽  
Vol 185 (1) ◽  
pp. 571-582
Author(s):  
G. P. Mitchell ◽  
N. D. Whitehouse
Keyword(s):  
Fuel Consumption ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Inlet Valve ◽  
Gas Engine ◽  
Air Inlet ◽  
Medium Speed ◽  
Performance Patterns ◽  
Air Mixing ◽  
Perfect Mixing

This paper reports on the effect of position and timing of gas admission on the performance of a spark-ignition engine using methane. The investigation was aimed at exploring the effect of design limitations experienced with turbocharged medium-speed engines. Performance was judged on the criteria of optimum specific fuel consumption combined with minimum cyclic dispersion. Results were obtained at a fixed fuel consumption and mostly at fixed air/gas ratios and are not, therefore, necessarily directly applicable to commercial engines. For near stoichiometric air/gas ratios, optimum performance was obtained most easily by early and prolonged gas admission. Better thermal efficiency was obtained with weak mixtures, about 80 per cent of stoichiometric, and optimum gas admission was generally less obvious. Performance patterns did not vary consistently with gas admission timing; they improved or deteriorated with late gas admission, depending on the type of air inlet valve—presumably owing to air motion and gas/air mixing in the cylinder. From the results obtained, it seems probable that cyclic dispersion was minimal when the mixture around the spark was at, or near, stoichiometric and was most easily achieved by perfect mixing when the overall mixture was near stoichiometric.

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