Quote.........dvldoc..
Water/alcohol make power through increasing ignition timing and adding O2 to the combustion process as well as pressure from the steam from the water.
Uuumm you can't have it both ways here........by adding 02 to the combustion chamber which we all agree has a cooling effect and mixed with methanol an even larger cooling effect this would not add pressure in the cylinder but in fact would lessen the pressure although the methanol would be adding (a form of fueling in addition to cooling) .Why do you think that this means you can add more boost pressure......because pressure is lost because of this cooling effect!! .......plus thermal efficiency
Remember that adding timing over that of the optimum injection window (injecting fuel long after tdc) will increase cylinder pressure because of the raised temperature the extra fuel and combustion are giving past this point and the same would apply to injecting to early btdc even more so in terms of added pressure to the cylinder which imo would happening with injecting methanol (premature ignition) and which propane as the same effect (talk about knock!!)
http://www.freepatentsonline.com/5718194.html
Quote...........
Issue Table of Contents | View myArticles Full Text: [ PDF (1357 KB) | HTML ]
Evaluation of Interstage Water Injection Effect on Compressor and Engine Performance
Journal of Engineering for Gas Turbines and Power -- October 2006 -- Volume 128, Issue 4, pp. 849-856
I. Roumeliotis, Research Assistant and K. Mathioudakis, Associate Professor
Laboratory of Thermal Turbomachines, National Technical University of Athens, Iroon Polytechniou 9, Athens 15773, Greece
(Received 1 October 2003; revised 1 March 2004)
The present paper examines the effect of water injection at the compressor inlet or between stages, on its operation. A wet compression model coupled with an engine performance model is used. The wet compression model produces the compressor performance map when water is present and consists of a one-dimensional stage stacking model, coupled with a droplet evaporation model. The effect of water injection on overall performance and individual stage operation is examined. The map-generation procedure is embedded in an engine performance model and a study of water injection effect on overall engine performance is undertaken. The possibility to evaluate the effect on various parameters such as power, thermal efficiency, surge margin, as well as the progression of droplets through the stages is demonstrated. The results indicate that water injection causes significant stage rematching, leading the compressor toward stall and that the performance enhancement is greater as the injection point moves towards compressor inlet.
©2006 American Society of Mechanical Engineers
doi:10.1115/1.2135823 Additional Information View ISI's Web of Science data for this article: [ Source Abstract | Related Articles ]
Water/alcohol make power through increasing ignition timing and adding O2 to the combustion process as well as pressure from the steam from the water.
Uuumm you can't have it both ways here........by adding 02 to the combustion chamber which we all agree has a cooling effect and mixed with methanol an even larger cooling effect this would not add pressure in the cylinder but in fact would lessen the pressure although the methanol would be adding (a form of fueling in addition to cooling) .Why do you think that this means you can add more boost pressure......because pressure is lost because of this cooling effect!! .......plus thermal efficiency
Remember that adding timing over that of the optimum injection window (injecting fuel long after tdc) will increase cylinder pressure because of the raised temperature the extra fuel and combustion are giving past this point and the same would apply to injecting to early btdc even more so in terms of added pressure to the cylinder which imo would happening with injecting methanol (premature ignition) and which propane as the same effect (talk about knock!!)
http://www.freepatentsonline.com/5718194.html
Quote...........
Issue Table of Contents | View myArticles Full Text: [ PDF (1357 KB) | HTML ]
Evaluation of Interstage Water Injection Effect on Compressor and Engine Performance
Journal of Engineering for Gas Turbines and Power -- October 2006 -- Volume 128, Issue 4, pp. 849-856
I. Roumeliotis, Research Assistant and K. Mathioudakis, Associate Professor
Laboratory of Thermal Turbomachines, National Technical University of Athens, Iroon Polytechniou 9, Athens 15773, Greece
(Received 1 October 2003; revised 1 March 2004)
The present paper examines the effect of water injection at the compressor inlet or between stages, on its operation. A wet compression model coupled with an engine performance model is used. The wet compression model produces the compressor performance map when water is present and consists of a one-dimensional stage stacking model, coupled with a droplet evaporation model. The effect of water injection on overall performance and individual stage operation is examined. The map-generation procedure is embedded in an engine performance model and a study of water injection effect on overall engine performance is undertaken. The possibility to evaluate the effect on various parameters such as power, thermal efficiency, surge margin, as well as the progression of droplets through the stages is demonstrated. The results indicate that water injection causes significant stage rematching, leading the compressor toward stall and that the performance enhancement is greater as the injection point moves towards compressor inlet.
©2006 American Society of Mechanical Engineers
doi:10.1115/1.2135823 Additional Information View ISI's Web of Science data for this article: [ Source Abstract | Related Articles ]
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