This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Experimental Heat Release Rate Analysis of a Diesel Engine Operating Under Steady State Conditions
Annotation ability available
Sector:
Language:
English
Abstract
An experimental heat release rate analysis was conducted on a six cylinder, 12.7 liter Detroit Diesel Series 60 turbocharged engine operating under steady state conditions. The overall chemical, or gross, rate of heat release and the net apparent rate of heat release were determined from experimental measurements. The gross, time averaged, heat release rate was determined by two separate concepts/methods using exhaust gas concentration measurements from the Nicolet Rega 7000 Real Time Exhaust Gas Analyzer and the measured exhaust gas flow rate. The net apparent rate of heat release was determined from the in-cylinder pressure measurements for each of the six cylinders, averaged over 80 cycles. These pressure measurements were obtained using a VXI based Tektronix data acquisition system and LabVIEW software. A computer algorithm then computed the net apparent rate of heat release from the averaged in-cylinder pressure measurements. Thus, a simple but powerful technique of experimentally determining the average overall rate of heat transfer to the walls is proposed by taking the difference between the gross and net apparent rates of heat release. An error analysis then investigated the feasibility of this method. The possible sources of error are (1) the confidence limits of the exhaust gas concentration measurements; (2) errors in the fuel and air flow measurements; and (3) error in the determination of the net heat release rates from the in-cylinder pressure measurements. This is the first step towards the eventual objective of developing an experimental technique that determines these rates of heat release for various transient conditions. Both of these techniques can then be used to validate engine heat transfer models and examine the effects of insulated ceramic coatings in the cylinder.
Recommended Content
Topic
Citation
Homsy, S. and Atreya, A., "An Experimental Heat Release Rate Analysis of a Diesel Engine Operating Under Steady State Conditions," SAE Technical Paper 970889, 1997, https://doi.org/10.4271/970889.Also In
Diesel Engine Combustion Processes and Emission Control Technologies
Number: SP-1246; Published: 1997-02-24
Number: SP-1246; Published: 1997-02-24
References
- Krieger, R.B. Borman, G.L. “The Computation of Apparent Heat Release for Internal Combustion Engines.” ASME Paper 66-WA/DGP-4 1966
- Gatowski, J.A. Balles, E.N. Chun, K.M. Nelson, F.E. Ekchian, J.A. Heywood, J.B. “Heat Release Analysis of Engine Pressure Data.” SAE Paper 841539 1985
- Rakopoulos, C.D. Hountalas, D.T. “Net and Gross Heat Release Rate Calculations in a DI Diesel Engine Using Various Heat Transfer Models.” Transactions of the ASME Thermodynamics and the Design, Analysis, and Improvement of Energy Systems 33 251 262 1994
- Kouremenos, D.A. Rakopoulos, C.D. Hountalas, D.T. “Theoretical and Experimental Heat Release Rate Calculations for Various Types of Direct injection Diesel Engines.” Transactions of the ASME Thermodynamics and the Design, Analysis, and Improvement of Energy Systems 33 239 249 1994
- Callahan, Timothy J. Yost, Douglas M. Ryan, Thomas W. III “Acquisition and Interpretation of Diesel Engine Heat Release Data.” SAE Paper 852068 1985
- Randolph, Andrew L. “Methods of Processing Cylinder Pressure Transducer Signals to Maximize Data Accuracy.” SAE Paper 900170 1970
- Heywood, J.B. Internal Combustion Engine Fundamentals McGraw-Hill New York 1988
- Chen, Simon K. Chang, Thomas Z. Chang, Jack Sanle Bair, Robert “On-Line PC Based Engine Analyzer and Simulator.” SAE Paper 881256 1988