Progress on the Investigation of Coal-Water Slurry Fuel Combustion in a Medium-Speed Diesel Engine: Part 6—In-Cylinder Combustion Photography Studies

1993 ◽  
Vol 115 (4) ◽  
pp. 790-797 ◽  
Author(s):  
B. D. Hsu ◽  
D. P. Branyon
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Fuel Combustion ◽  
Water Slurry ◽  
Coal Fuel ◽  
Medium Speed ◽  
Engine Part ◽  
Coal Water Slurry ◽  
Release Data ◽  
Photo Study

In the GE 7FDL single cylinder research diesel engine, in-cylinder high-speed photographic studies were conducted on coal-water slurry (CWS) fuel combustion. Distinct flames of pilot and CWS combustion were noticed. It was proven that the coal fuel burns after piston impingement and secondary atomization. Agglomerated particles will develop when combustion conditions are not favorable. Cylinder pressure data were simultaneously recorded for each film frame. Heat release data can thus be produced for each photo study. Most of the findings of earlier combustion studies on engine performances were confirmed.

Progress on the Investigation of Coal-Water Slurry Fuel Combustion in a Medium-Speed Diesel Engine: Part 5—Combustion Studies

1992 ◽  
Vol 114 (3) ◽  
pp. 515-521 ◽  
Author(s):  
B. D. Hsu ◽  
G. L. Confer ◽  
Z. J. Shen
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Combustion Efficiency ◽  
Fuel Combustion ◽  
Injection Timing ◽  
Water Slurry ◽  
Medium Speed ◽  
Engine Part ◽  
Coal Water Slurry

In the GE 7FDL single-cylinder research diesel engine, coal-water slurry (CWS) fuel combustion optimization studies were conducted using electronically controlled CWS and pilot accumulator injectors. The most important performance parameters of peak firing pressure, combustion efficiency (coal burnout), and specific fuel comsumption were evaluated in relationship to CWS and pilot injection timing, CWS injector hole size, shape, and number, CWS fuel injection spray angles and injection pressure. Heat release diagrams, as well as exhaust samples (gaseous and particulate), were analyzed for each case. Interesting effects of fuel spray impingement and CWS fuel “Delayed Ignition” were observed. With the engine operating at 2.0 MPa IMEP and 1050 rpm, it was able to obtain over 99.5 percent combustion efficiency while holding the cylinder firing pressure below 17 MPa and thermal efficiency equivalent to diesel fuel operation.

Progress on the Investigation of Coal-Water-Slurry Fuel Combustion in a Medium-Speed Diesel Engine: Part 3—Accumulator Injector Performance

1989 ◽  
Vol 111 (3) ◽  
pp. 516-520 ◽  
Author(s):  
B. D. Hsu ◽  
G. L. Leonard ◽  
R. N. Johnson
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Diesel Oil ◽  
Fuel Combustion ◽  
Injection System ◽  
Water Slurry ◽  
Medium Speed ◽  
Engine Part ◽  
Coal Water Slurry

Coal-water-slurry (CWS) engine tests designed to evaluate a new accumulator-based injection system are described in this paper. The new injection system was found to improve CWS burnout considerably at both full and part engine loads. The peak cylinder firing pressure when operating with CWS was no higher than when operating with diesel oil. These data demonstrate the improved engine performance that can be achieved with the accumulator-based injection system.

Coal-Water-Slurry Autoignition in a High-Speed Detroit Diesel Engine

1994 ◽  
Author(s):  
James A. Schwalb ◽  
Thomas W. Ryan ◽  
Ramesh M. Kakwani ◽  
Richard E. Winsor
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Water Slurry ◽  
Coal Water Slurry

Progress on the Investigation of Coal-Water Slurry Fuel Combustion in a Medium Speed Diesel Engine: Part 1—Ignition Studies

1988 ◽  
Vol 110 (3) ◽  
pp. 415-422 ◽  
Author(s):  
B. D. Hsu
Keyword(s):  
Fuel Injection ◽  
Compression Ignition ◽  
Injection Equipment ◽  
Water Slurry ◽  
Medium Speed ◽  
Engine Part ◽  
Engine Cylinder ◽  
Coal Water Slurry ◽  
Pilot Fuel ◽  
Diesel Fuel Injection

A micronized de-ashed coal-water slurry (CWS) fuel of approximately 50 percent coal loading has been successfully ignited and burned in one GE 7FDL engine cylinder at 1050 rpm. For this study, only about 1/3 of the full load fuel engery was supplied due to limitations of the fuel injection equipment used. Three types of ignition methods have been investigated: compression ignition with no ignition aid; separate diesel pilot fuel injection to ignite the CWS fuel; combined CWS and pilot diesel fuel injection (stratified pilot ignition). Conditions of ignition and the burning characteristics that immediately followed using the above three ignition methods are described.

A High-Speed Direct Injection Diesel Engine for Passenger Cars

1988 ◽  
Vol 202 (3) ◽  
pp. 171-181 ◽  
Author(s):  
J A Stephenson ◽  
B A Hood
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Fuel Injection ◽  
Direct Injection ◽  
Injection System ◽  
Passenger Cars ◽  
Medium Speed ◽  
Medium Speed Engine ◽  
Hsdi Diesel Engine ◽  
Wide Speed Range

The paper describes the development of a high-speed direct injection (HSDI) diesel engine suitable for passenger car applications. The evolution from a low emissions medium-speed engine, through a four-cylinder 2.3 litre research engine, into a four-cylinder 2.0 litre production engine is presented. The challenge to the engineer has been to develop the HSDI engine to operate with acceptable noise, emissions, smoke and driveability over the wide speed range (up to 5000 r/min) required for passenger cars. The key element in this task was the optimization of the combustion system and fuel injection equipment. The HSDI is shown to have a significant fuel economy advantage over the prechamber indirect injection (IDI) engine. Future developments of the fuel injection system are described which will further enhance the HSDI engine and provide additional noise and emissions control.

Combustion of Coal-Water Slurry in a Two-Cycle Diesel Engine: Effects of Fuel Amount and Timing

1990 ◽  
Vol 112 (3) ◽  
pp. 376-383 ◽  
Author(s):  
T. Uzkan ◽  
C. E. Horton
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Cylinder Pressure ◽  
Release Rates ◽  
Energy Of Combustion ◽  
Water Slurry ◽  
Coal Particles ◽  
Coal Water Slurry ◽  
Temperature Heat ◽  
Pilot Fuel

Coal-water slurry having micronized coal particles with approximately 50 percent coal loading is successfully ignited and combusted in one cylinder of a two-cylinder 645 EMD engine by using diesel fuel pilot ignition aid. The effects of three different parameters, namely, (a) pilot timing, (b) pilot amount, and (c) CWS fuel amount, are investigated in detail. The physical trends of combustion under single parametric variations are presented in terms of the cylinder pressure, temperature, heat release rates, and cumulative heat release curves. CWS combustion with less than 5 percent of the energy of combustion coming from pilot fuel is achieved.

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