Thermal Characterization of Combustion Chamber Deposits on the HCCI Engine Piston and Cylinder Head Using Instantaneous Temperature Measurements

2009 ◽  
Author(s):  
Orgun Güralp ◽  
Mark Hoffman ◽  
Dennis N. Assanis ◽  
Zoran Filipi ◽  
Tang-Wei Kuo ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Cylinder Head ◽  
Thermal Characterization ◽  
Temperature Measurements ◽  
Hcci Engine ◽  
Engine Piston ◽  
Instantaneous Temperature ◽  
Combustion Chamber Deposits

Method for Determining Instantaneous Temperature at the Surface of Combustion Chamber Deposits in an HCCI Engine

2013 ◽  
Vol 135 (8) ◽  
Author(s):  
Orgun Güralp ◽  
Paul Najt ◽  
Zoran S. Filipi
Keyword(s):  
Surface Temperature ◽  
Combustion Chamber ◽  
High Efficiency ◽  
Combustion Process ◽  
Heat Transfer Process ◽  
Valuable Insight ◽  
Hcci Combustion ◽  
Crank Angle ◽  
Instantaneous Temperature ◽  
Combustion Chamber Deposits

Homogeneous charge compression ignition (HCCI) combustion is widely regarded as an attractive option for future high efficiency gasoline engines. HCCI combustion permits operation with a highly dilute, well mixed charge, resulting in high thermal efficiency and extremely low NOx and soot emissions, two qualities essential for future propulsion system solutions. Because HCCI is a thermokinetically dominated process, full understanding of how combustion chamber boundary thermal conditions affect the combustion process are crucial. This includes the dynamics of the effective chamber wall surface temperature, as dictated by the formation of combustion chamber deposits (CCD). It has been demonstrated that, due to the combination of CCD thermal properties and the sensitivity of HCCI to wall temperature, the phasing of autoignition can vary significantly as CCD coverage in the chamber increases. In order to better characterize and quantify the influence of CCDs, a numerical methodology has been developed which permits calculation of the crank-angle resolved local temperature profile at the surface of a layer of combustion chamber deposits. This unique predictor-corrector methodology relies on experimental measurement of instantaneous temperature underneath the layer, i.e., at the metal-CCD interface, and known deposit layer thickness. A numerical method for validation of these calculations has also been devised. The resultant crank-angle resolved CCD surface temperature and heat flux profiles both on top and under the CCD layer provide valuable insight into the near wall phenomena, and shed light on the interplay between the dynamics of the heat transfer process and HCCI burn rates.

Detection of Combustion Chamber Deposits in Diesel Engines Through Cylinder Pressure and Exhaust Temperature Measurements

2005 ◽  
Author(s):  
D. Gardiner ◽  
M. LaViolette ◽  
W. D. Allan ◽  
G. Wang ◽  
M. F. Bardon
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Temperature Measurements ◽  
Cylinder Pressure ◽  
Clear Trend ◽  
Exhaust Temperature ◽  
Peak Heat Release Rate ◽  
Low Load ◽  
Combustion Chamber Deposits ◽  
Using Data

This paper describes experimental research aimed at developing techniques for monitoring the growth of combustion chamber deposits in diesel engines using data obtained from cylinder pressure and exhaust temperature measurements. A naturally aspirated single cylinder research engine was operated alternately between low load “coking” conditions (2.5 bar BMEP) and higher load “decoking” conditions (5.5 bar BMEP) intended to promote the formation and removal, respectively of combustion chamber deposits. The polytropic exponent of compression was observed to increase during coking runs and decrease during decoking runs. The peak heat release rate was observed to decrease during coking runs and increase during decoking runs. The peak cycle value of the first derivative of the exhaust thermocouple signal decreased during coking runs but exhibited no clear trend during decoking runs. Conventional exhaust temperature measurements showed no consistent trend during coking runs but the exhaust temperature decreased during decoking runs.

Characterizing the Effect of Combustion Chamber Deposits on a Gasoline HCCI Engine

2006 ◽  
Author(s):  
Orgun Güralp ◽  
Mark Hoffman ◽  
Dennis N. Assanis ◽  
Zoran Filipi ◽  
Tang-Wei Kuo ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Hcci Engine ◽  
Combustion Chamber Deposits

Structural characterization of carbonaceous combustion-chamber deposits

Carbon ◽  
2009 ◽  
Vol 47 (14) ◽  
pp. 3322-3331 ◽  
Author(s):  
J.M.C. Pinto da Costa ◽  
R.F. Cracknell ◽  
L. Sarkisov ◽  
N.A. Seaton
Keyword(s):  
Combustion Chamber ◽  
Structural Characterization ◽  
Combustion Chamber Deposits

Method for Determining Instantaneous Temperature at the Surface of Combustion Chamber Deposits in an HCCI Engine

2012 ◽  
Author(s):  
Orgun Güralp ◽  
Paul Najt ◽  
Zoran S. Filipi
Keyword(s):  
Surface Temperature ◽  
Combustion Chamber ◽  
High Efficiency ◽  
Combustion Process ◽  
Heat Transfer Process ◽  
Valuable Insight ◽  
Hcci Combustion ◽  
Crank Angle ◽  
Instantaneous Temperature ◽  
Combustion Chamber Deposits

Homogeneous charge compression ignition (HCCI) combustion is widely regarded an attractive option for future high efficiency gasoline engines. HCCI combustion permits operation with a highly dilute, well mixed charge, resulting in high thermal efficiency and extremely low NOx and soot emissions, two qualities essential for future propulsion system solutions. Because HCCI is a thermo-kinetically dominated process, full understanding of how combustion chamber boundary thermal conditions affect the combustion process are crucial. This includes the dynamics of the effective chamber wall surface temperature, as dictated by the formation of combustion chamber deposits (CCD). It has been demonstrated that, due to the combination of CCD thermal properties and the sensitivity of HCCI to wall temperature, the phasing of auto-ignition can vary significantly as CCD coverage in the chamber increases. In order to better characterize and quantify the influence of CCDs, a numerical methodology has been developed which permits calculation of the crank-angle resolved local temperature profile at the surface of a layer of combustion chamber deposits. This unique predictor-corrector methodology relies on experimental measurement of instantaneous temperature underneath the layer, i.e. at the metal-CCD interface, and known deposit layer thickness. A numerical method for validation of these calculations has also been devised. The resultant crank-angle resolved CCD surface temperature and heat flux profiles both on top and under the CCD layer provide valuable insight into the near wall phenomena, and shed light on the interplay between the dynamics of the heat transfer process and HCCI burn rates.

Characterization of Combustion Chamber Deposits from a Gasoline Direct Injection SI Engine

2003 ◽  
Author(s):  
Farshid Owrang ◽  
Håkan Mattsson ◽  
Anders Nordlund ◽  
Jim Olsson ◽  
Jörgen Pedersen
Keyword(s):  
Combustion Chamber ◽  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Si Engine ◽  
Combustion Chamber Deposits
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