Advanced

The Performance of a Dual Fuel HCCI Engine

Vargas Munoz, Rafael (2006)
Department of Energy Sciences
Abstract
The HCCI engine has shown great qualities such as high efficiency combined with low emissions. However, many issues have not totally been solved yet. One way to control the combustion timing, one of the commented issues, is dual fuel utilizing the difference in ignition temperature between different fuels.

So, from this point on it is not difficult to think about developing a big mapping of one HCCI engine, controlling this variable to obtain the best performance of this kind of engine. After doing that, the most interesting ranges of operation will

be known as well as the possibility of studying them more in depth.

The test engine is a modified six cylinder Scania DSC12 turbo charged diesel engine. All experiments are conducted with... (More)
The HCCI engine has shown great qualities such as high efficiency combined with low emissions. However, many issues have not totally been solved yet. One way to control the combustion timing, one of the commented issues, is dual fuel utilizing the difference in ignition temperature between different fuels.

So, from this point on it is not difficult to think about developing a big mapping of one HCCI engine, controlling this variable to obtain the best performance of this kind of engine. After doing that, the most interesting ranges of operation will

be known as well as the possibility of studying them more in depth.

The test engine is a modified six cylinder Scania DSC12 turbo charged diesel engine. All experiments are conducted with natural gas and n-heptane; the natural gas with nearly 120 in the octane scale (difficult ignition) and the n-heptane, zero in the octane scale (really easy ignition). This is one of the keys to control the combustion. In order to study the performance of the dual fuel engine, the operating parameters as engine speed, inlet pressure, inlet temperature, load and, of course, the

combustion timing, are varied and analyzed reading emissions efficiencies, fuel consumption, variability, losses ? in all their ranges. Afterwards in the points which

exceeded the limits regarding the in cylinder pressure rise rate and NOx emissions the engine has been run with the help of the turbo charger varying the inlet air pressure or, in other words, the inlet area of its turbine. In this way the NOx emissions do not reach an undesirable rate and the engine is always working under 15 bars of pressure rise per crank angle degree.

The test results show a higher efficiency close to 50 % and low emissions in the entire mapping using the turbo charger in the suitable condition. On the other hand, more CO and HC are produced. They can however be reduced with an oxidizing catalyst. (Less)
Please use this url to cite or link to this publication:
author
Vargas Munoz, Rafael
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
Combustion timing, ignition temperature, emission, efficiency, fuel comsumption, Technological sciences, Teknik
language
English
id
1326639
date added to LUP
2006-07-18
date last changed
2006-07-18
@misc{1326639,
  abstract     = {The HCCI engine has shown great qualities such as high efficiency combined with low emissions. However, many issues have not totally been solved yet. One way to control the combustion timing, one of the commented issues, is dual fuel utilizing the difference in ignition temperature between different fuels.

So, from this point on it is not difficult to think about developing a big mapping of one HCCI engine, controlling this variable to obtain the best performance of this kind of engine. After doing that, the most interesting ranges of operation will

be known as well as the possibility of studying them more in depth.

The test engine is a modified six cylinder Scania DSC12 turbo charged diesel engine. All experiments are conducted with natural gas and n-heptane; the natural gas with nearly 120 in the octane scale (difficult ignition) and the n-heptane, zero in the octane scale (really easy ignition). This is one of the keys to control the combustion. In order to study the performance of the dual fuel engine, the operating parameters as engine speed, inlet pressure, inlet temperature, load and, of course, the

combustion timing, are varied and analyzed reading emissions efficiencies, fuel consumption, variability, losses ? in all their ranges. Afterwards in the points which

exceeded the limits regarding the in cylinder pressure rise rate and NOx emissions the engine has been run with the help of the turbo charger varying the inlet air pressure or, in other words, the inlet area of its turbine. In this way the NOx emissions do not reach an undesirable rate and the engine is always working under 15 bars of pressure rise per crank angle degree.

The test results show a higher efficiency close to 50 % and low emissions in the entire mapping using the turbo charger in the suitable condition. On the other hand, more CO and HC are produced. They can however be reduced with an oxidizing catalyst.},
  author       = {Vargas Munoz, Rafael},
  keyword      = {Combustion timing,ignition temperature,emission,efficiency,fuel comsumption,Technological sciences,Teknik},
  language     = {eng},
  note         = {Student Paper},
  title        = {The Performance of a Dual Fuel HCCI Engine},
  year         = {2006},
}