Heat Release Analysis on Combustion and Parametric Study on Emissions of HCCI Engines Fueled with 2-Propanol/n-Heptane Blend Fuels

2006 ◽  
Vol 20 (5) ◽  
pp. 1870-1878 ◽  
Author(s):  
Lü ◽  
Hou ◽  
Ji ◽  
Zu ◽  
Huang
Keyword(s):  
Heat Release ◽  
Parametric Study ◽  
Hcci Engines ◽  
Release Analysis

Detailed approach for apparent heat release analysis in HCCI engines

Fuel ◽  
2010 ◽  
Vol 89 (9) ◽  
pp. 2323-2330 ◽  
Author(s):  
Morteza Fathi ◽  
R. Khoshbakhti Saray ◽  
M. David Checkel
Keyword(s):  
Heat Release ◽  
Hcci Engines ◽  
Release Analysis

Assessment of Residual Mass Estimation Methods for Cylinder Pressure Heat Release Analysis of HCCI Engines With Negative Valve Overlap

2011 ◽  
Author(s):  
Elliott A. Ortiz-Soto ◽  
Jiri Vavra ◽  
Aristotelis Babajimopoulos
Keyword(s):  
Heat Release ◽  
State Equation ◽  
Operating Conditions ◽  
Exhaust Valve ◽  
Estimation Methods ◽  
Cylinder Pressure ◽  
Hcci Engines ◽  
Release Analysis ◽  
Negative Valve Overlap ◽  
Valve Overlap

Increased residual levels in Homogeneous Charge Compression Ignition (HCCI) engines employing valve strategies such as recompression or negative valve overlap (NVO) imply that accurate estimation of residual gas fraction (RGF) is critical for cylinder pressure heat release analysis. The objective of the present work was to evaluate three residual estimation methods and assess their suitability under naturally aspirated and boosted HCCI operating conditions: i) the Simple State Equation method employs the Ideal Gas Law at exhaust valve closing (EVC); ii) the Mirsky method assumes isentropic exhaust process; and iii) the Fitzgerald method models in-cylinder temperature from exhaust valve opening (EVO) to EVC by accounting for heat loss during the exhaust process and uses measured exhaust temperature for calibration. Simulations with a calibrated and validated “virtual engine” were performed for representative HCCI operating conditions of engine speed, fuel-air equivalence ratio, NVO and intake pressure (boosting). The State Equation method always overestimated RGF by more than 10%. The Mirsky method was most robust, with average errors between 3–5%. The Fitzgerald method performed consistently better, ranging from no error to 5%, where increased boosting caused the largest discrepancies. A sensitivity study was also performed and determined that the Mirsky method was most robust to possible pressure and temperature measurement errors.

Assessment of Residual Mass Estimation Methods for Cylinder Pressure Heat Release Analysis of HCCI Engines With Negative Valve Overlap

2012 ◽  
Vol 134 (8) ◽  
Author(s):  
Elliott A. Ortiz-Soto ◽  
Jiri Vavra ◽  
Aristotelis Babajimopoulos
Keyword(s):  
Heat Release ◽  
State Equation ◽  
Operating Conditions ◽  
Exhaust Valve ◽  
Estimation Methods ◽  
Cylinder Pressure ◽  
Hcci Engines ◽  
Release Analysis ◽  
Negative Valve Overlap ◽  
Valve Overlap

Increased residual levels in homogeneous charge compression ignition (HCCI) engines employing valve strategies such as recompression or negative valve overlap (NVO) imply that accurate estimation of residual gas fraction (RGF) is critical for cylinder pressure heat release analysis. The objective of the present work was to evaluate three residual estimation methods and assess their suitability under naturally aspirated and boosted HCCI operating conditions: (i) the simple state equation method employs the ideal gas law at exhaust valve closing (EVC); (ii) the Mirsky method assumes isentropic exhaust process; and (iii) the Fitzgerald method models in-cylinder temperature from exhaust valve opening (EVO) to EVC by accounting for heat loss during the exhaust process and uses measured exhaust temperature for calibration. Simulations with a calibrated and validated “virtual engine” were performed for representative HCCI operating conditions of engine speed, fuel-air equivalence ratio, NVO and intake pressure (boosting). The state equation method always overestimated RGF by more than 10%. The Mirsky method was most robust, with average errors between 3–5%. The Fitzgerald method performed consistently better, ranging from no error to 5%, where increased boosting caused the largest discrepancies. A sensitivity study was also performed and determined that the Mirsky method was most robust to possible pressure and temperature measurement errors.

scholarly journals Heat release analysis for rapid compression machines: Challenges and opportunities

2019 ◽  
Vol 37 (1) ◽  
pp. 603-611 ◽  
Author(s):  
S. Scott Goldsborough ◽  
Jeffrey Santner ◽  
Dongil Kang ◽  
Aleksandr Fridlyand ◽  
Toby Rockstroh ◽  
...  
Keyword(s):  
Heat Release ◽  
Challenges And Opportunities ◽  
Release Analysis ◽  
Rapid Compression

Combustion heat release analysis of ethanol or n-butanol diesel fuel blends in heavy-duty DI diesel engine

Fuel ◽  
2011 ◽  
Vol 90 (5) ◽  
pp. 1855-1867 ◽  
Author(s):  
D.C. Rakopoulos ◽  
C.D. Rakopoulos ◽  
R.G. Papagiannakis ◽  
D.C. Kyritsis
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Diesel Fuel ◽  
Heavy Duty ◽  
Combustion Heat ◽  
Fuel Blends ◽  
Release Analysis ◽  
Di Diesel Engine

A Study on the Calculation of Heat Release Rate to Compensate the Error Due to Single Zone Assumption in Diesel Engine

2005 ◽  
Author(s):  
Seung Hyup Ryu ◽  
Ki Doo Kim ◽  
Wook Hyeon Yoon ◽  
Ji Soo Ha
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Computational Analysis ◽  
Combustion Process ◽  
Operating Conditions ◽  
Zone Model ◽  
Specific Heats ◽  
Start Of Injection ◽  
Release Analysis ◽  
Improved Model

Accurate heat release analysis based on the cylinder pressure trace is important for evaluating combustion process of diesel engines. However, traditional single-zone heat release models (SZM) have significant limitations due mainly to their simplified assumptions of uniform charge and homogeneity while neglecting local temperature distribution inside cylinder during combustion process. In this study, a heat release analysis based on single-zone model has been evaluated by comparison with computational analysis result using Fire-code, which is based on multi-dimensional model (MDM). The limitations of the single-zone assumption have been estimated. To overcome these limitations, an improved model that includes the effects of spatial non-uniformity has been applied. From this improved single-zone heat release model (Improved-SZM), two effective values of specific heats ratios, denoted by γV and γH in this study, have been introduced. These values are formulated as the function of charge temperature changing rate and overall equivalence ratio by matching the results of the single-zone analysis to those of computational analysis using Fire-code about medium speed marine diesel engine. Also, it is applied that each equation of γV and γH has respectively different slopes according to several meaningful regions such as the start of injection, the end of injection, the maximum cylinder temperature, and the exhaust valve open. This calculation method based on improved single-zone model gives a good agreement with Fire-code results over the whole range of operating conditions.

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