Unsteady Convection Model for Heat Release Analysis of IC Engine Pressure Data

2000 ◽  
Author(s):  
A. E. Catania ◽  
D. Misul ◽  
A. Mittica ◽  
E. Spessa
Keyword(s):  
Heat Release ◽  
Pressure Data ◽  
Ic Engine ◽  
Release Analysis ◽  
Convection Model

Heat Release Analysis of Oxygen-Enriched Diesel Combustion

1993 ◽  
Vol 115 (4) ◽  
pp. 761-768 ◽  
Author(s):  
D. Assanis ◽  
E. Karvounis ◽  
R. Sekar ◽  
W. Marr
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Oxygen Enrichment ◽  
Operating Conditions ◽  
Diesel Combustion ◽  
The Novel ◽  
Pressure Data ◽  
Engine Operation ◽  
Combustion Simulation ◽  
Release Analysis

A heat release correlation for oxygen-enriched diesel combustion is being developed through heat release analysis of cylinder pressure data from a single-cylinder diesel engine operating under various levels of oxygen enrichment. Results show that standard combustion correlations available in the literature do not accurately describe oxygen-enriched diesel combustion. A novel functional form is therefore proposed, which is shown to reproduce measured heat release profiles closely, under different operating conditions and levels of oxygen enrichment. The mathematical complexity of the associated curve-fitting problem is maintained at the same level of difficulty as for standard correlations. When the novel correlation is incorporated into a computer simulation of diesel engine operation with oxygen enrichment, the latter predicts pressure traces in excellent agreement with measured pressure data. This demonstrates the potential of the proposed combustion simulation to guide the application of oxygen-enriched technology successfully to a variety of multicylinder diesel systems.

Heat Release Analysis of Engine Pressure Data

1984 ◽  
Author(s):  
J. A. Gatowski ◽  
E. N. Balles ◽  
K. M. Chun ◽  
F. E. Nelson ◽  
J. A. Ekchian ◽  
...  
Keyword(s):  
Heat Release ◽  
Pressure Data ◽  
Release Analysis

Error Propagation in Heat Release Analysis of Pilot Ignited Natural Gas Combustion

2007 ◽  
Author(s):  
J. B. Weathers ◽  
B. T. Marvel ◽  
K. K. Srinivasan ◽  
P. J. Mago ◽  
L. M. Chamra ◽  
...  
Keyword(s):  
Natural Gas ◽  
Uncertainty Analysis ◽  
Heat Release ◽  
Primary Objective ◽  
Cylinder Pressure ◽  
Pressure Data ◽  
Compression Ignition Engine ◽  
Gas Combustion ◽  
Total Uncertainty ◽  
Release Analysis

Uncertainty within measured variables and how such errors propagate throughout a given equation or set of equations can greatly affect the accuracy and understanding of the result for a given experiment. The major motivation (or impetus) for performing a detailed uncertainty analysis before beginning an experiment is to identify variables or parameters that would have the greatest/least impact on the total uncertainty of the result. The scope of this study is to perform a detailed uncertainty analysis on estimates of net heat release in a compression ignition engine. The analysis will examine each term of the net heat release rate equation, which is routinely estimated using a single zone thermodynamic model, and evaluate the respective Uncertainty Magnification Factors (UMF) and Uncertainty Percentage Distribution (UPC). Since the net work output from the engine is directly related to in-cylinder pressure data, it is important to evaluate the uncertainties associated with cylinder pressure measurement. The primary objective of this paper is to analyze the effect of biased and precision uncertainties associated with the measured cylinder pressure data on the rate of heat release (ROHR) of a pilot ignited natural gas engine. Sensitivity analysis of other parameters such as the correct estimation of compression ratio and using appropriate thermodynamic properties of combustion gases are also discussed. The estimates from this analysis are expected to aid the development of a detailed experimental matrix to analyze the nature of energy release and performance of combustion engines.

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

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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