The Calculation of Heat Release Energy from Engine Cylinder Pressure Data

1998 ◽  
Author(s):  
Michael F.J. Brunt ◽  
Harjit Rai ◽  
Andrew L. Emtage
Keyword(s):  
Heat Release ◽  
Cylinder Pressure ◽  
Pressure Data ◽  
Engine Cylinder

Experiments With Coal Fuels in a High-Temperature Diesel Engine

1988 ◽  
Vol 110 (3) ◽  
pp. 444-452 ◽  
Author(s):  
W. E. Likos ◽  
T. W. Ryan
Keyword(s):  
High Temperature ◽  
Diesel Fuel ◽  
Operating Conditions ◽  
Coal Slurry ◽  
Pilot Injection ◽  
Cylinder Pressure ◽  
Pressure Data ◽  
Engine Cylinder ◽  
Burning Rates ◽  
Low Heat Rejection Engine

The combustion of 50 wt percent coal slurries, using water, diesel fuel, and methanol as carrier liquids, was investigated in a single-cylinder research engine. High temperatures were achieved in the engine cylinder using low-heat-rejection engine technology, electrically heated glow plugs, and heated inlet air. Comparisons of the fuels and different methods of providing high cylinder temperature were made using cylinder pressure data and heat release calculations. Autoignition of the coal/water slurries was attained using auxiliary heat input. The burning rates of all the autoignited slurries were significantly enhanced by using a pilot injection of diesel fuel. Under some operating conditions the engine thermal efficiency was equal to diesel fuel performance. It was apparent that engines designed for coal slurry should maximize the prechamber volume.

Preliminary Energy-Efficiency Analysis on Multi-Pulse Injection Schedule in a Diesel Engine

2005 ◽  
Author(s):  
Raj Kumar ◽  
Ming Zheng ◽  
Graham T. Reader
Keyword(s):  
Energy Efficiency ◽  
Diesel Engine ◽  
Heat Release ◽  
Fuel Injection ◽  
Efficiency Analysis ◽  
Simulation Software ◽  
Cylinder Pressure ◽  
Pressure Data ◽  
Exhaust Temperature ◽  
Energy Efficiency Analysis

The multi-pulse fuel injection in a diesel engine is considered an effective way to reduce nitrogen oxides (NOx) emissions by heat-release shaping. In this research a preliminary energy efficiency analysis has been conducted for various split injection rates and schedules using the in-house and the commercial engine simulation software. Theoretical findings have been validated using experimentally obtained cylinder pressure data for various injection timings from a single-cylinder engine. The theoretical analysis on the shape of heat- release has been made to evaluate the energy efficiency of the post injection pulses on the engine exhaust temperature increases. An investigation of the cycle-to-cycle variation has also been performed for the measured cylinder pressure data.

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.

A Model for Crank-Angle-Resolved Engine Cylinder Pressure Estimation

2018 ◽  
Author(s):  
Jing Wu ◽  
Andres Jacoby ◽  
Daniel Llamocca ◽  
Brian Sangeorzan
Keyword(s):  
Cylinder Pressure ◽  
Engine Cylinder ◽  
Crank Angle ◽  
Pressure Estimation

Analysis of Incylinder Pressure and Temperature Variation in a Four-Stroke S. I. Engine Using Wiebe’s Combustion Model

2014 ◽  
Vol 984-985 ◽  
pp. 957-961
Author(s):  
Vijayashree ◽  
P. Tamil Porai ◽  
N.V. Mahalakshmi ◽  
V. Ganesan
Keyword(s):  
Heat Release ◽  
Combustion Process ◽  
Pressure Variation ◽  
Spark Ignition Engine ◽  
Working Fluid ◽  
Combustion Model ◽  
Cylinder Pressure ◽  
Crank Angle ◽  
Experimental Values ◽  
Release Model

This paper presents the modeling of in-cylinder pressure variation of a four-stroke single cylinder spark ignition engine. It uses instantaneous properties of working fluid, viz., gasoline to calculate heat release rates, needed to quantify combustion development. Cylinder pressure variation with respect to either volume or crank angle gives valuable information about the combustion process. The analysis of the pressure – volume or pressure-theta data of a engine cycle is a classical tool for engine studies. This paper aims at demonstrating the modeling of pressure variation as a function of crank angle as well as volume with the help of MATLAB program developed for this purpose. Towards this end, Woschni heat release model is used for the combustion process. The important parameter, viz., peak pressure for different compression ratios are used in the analysis. Predicted results are compared with experimental values obtained for a typical compression ratio of 8.3.

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