Experimental Study of Diesel Engine Cycle-to-Cycle Variation—Part I: Analysis of Cycle-to-Cycle Cylinder Pressure Variation

1989 ◽  
Vol 33 (03) ◽  
pp. 252-259
Author(s):  
C. Chayangkura ◽  
R. Latorre ◽  
D. Charnews
Keyword(s):  
Diesel Engine ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Maximum Pressure ◽  
Cylinder Pressure ◽  
Cycle Variation ◽  
Engine Cylinder ◽  
Marine Diesel ◽  
Test Engine ◽  
Good Agreement

With the increased use of marine diesel engines, engine-induced vibration has become an important problem. The vibration is caused by engine output variation, which has not been fully documented. In this paper the results of an analysis of the cycle-to-cycle variation in the cylinder pressure of a single-cylinder diesel test engine are presented. Data covering tests with different compression ratio settings and speeds are analyzed in terms of (a) cycle-to-cycle variation in maximum cylinder pressure Pmax and (b) cycle-to-cycle variation in the combustion work, denoted PI. Special tests are made to validate the data acquisition and data reduction system. The validation shows that the cylinder pressure measurements from the test engine run as a spark-ignition engine are in good agreement with published results. Analysis of the diesel engine test measurements show that the coefficient of variation in the diesel engine cylinder pressure is smaller than the spark-ignition engine value. These results also show there is relatively little correlation between the cycle-to-cycle coefficient for variation of the maximum pressure and the corresponding variation in the combustion work, PI.

Experimental Study of Diesel Engine Cycle-to-Cycle Variation—Part II: Correlation of Ignition Delay and Cylinder Pressure Variation

1989 ◽  
Vol 33 (04) ◽  
pp. 310-317
Author(s):  
M. Soonnadum ◽  
R. Latorre ◽  
D. Charnews
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Poor Correlation ◽  
Maximum Pressure ◽  
Cylinder Pressure ◽  
Cylinder Test ◽  
Cycle Variation ◽  
Marine Diesel ◽  
Engine Excitation ◽  
Variation Part

Marine diesel engine excitation can occur from the cycle-to-cycle variation in the engine output. The cycle-to-cycle variation in maximum cylinder pressure is often used to represent this variation. Recent tests indicate a poor correlation between the variation in maximum pressure and variation in pressure impulse (PI). This paper summarizes the results of systematic experiments to determine the cycle-to-cycle variation in maximum cylinder pressure, ignition delay (ID), and corresponding ignition pressure in a single-cylinder test diesel engine at various rpm and compression ratios. Comparisons show that there is a high correlation between the cycle-to-cycle variation in ID and PI. Consequently, the variation in the ignition delays should be used instead of the maximum pressure.

Experimental Study of Diesel Engine Cycle-to-Cycle Variation—Part IV

1993 ◽  
Vol 37 (03) ◽  
pp. 273-279
Author(s):  
Mohamad Orianto ◽  
R. Latorre ◽  
D. Charnews
Keyword(s):  
Diesel Engine ◽  
Reasonable Agreement ◽  
Injection Timing ◽  
Cylinder Pressure ◽  
Cycle Variation ◽  
Marine Diesel ◽  
Test Engine ◽  
Engine Excitation ◽  
Injection Setting ◽  
Variation Part

Marine diesel engine excitation can occur from the cycle-to-cycle variation in the engines output. The cycle-to-cycle variation in maximum cylinder pressure (P,,=,) is often used to represent this variation. Earlier studies examined the correlation between the cycle-to-cycle variation in the maximum cylinder pressure (Pm~), pressure impulse (PI), and ignition delay (ID), for the case of constant injection setting. Recent studies showed the injection timing strongly affects the cycle-to-cycle variation. This paper summarizes the results of systematic experiments to determine cycle-to-cycle variation for a single-cylinder diesel test engine and extrapolation to estimate the cycle-to-cycle variation in a 12-cylinder 925-hp diesel propulsion engine. Comparison of the extrapolated and measured results shows reasonable agreement.

Experimental Study of Diesel Engine Cycle-to-Cycle Variation—Part III

1990 ◽  
Vol 34 (03) ◽  
pp. 218-223
Author(s):  
Somsak Jamjang ◽  
R. Latorre ◽  
D. Charnews
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Injection Timing ◽  
Cylinder Pressure ◽  
Pressure Impulse ◽  
Cylinder Test ◽  
Cycle Variation ◽  
Marine Diesel ◽  
Best Parameter ◽  
Engine Excitation

Marine diesel engine excitation can occur from the cycle-to-cycle variation in the engine output. The cycle-to-cycle variation in maximum cylinder pressure (Pmax) is often used to represent this variation. Earlier studies examined the correlation between the cycle-to-cycle variation in the maximum cylinder pressure (Ρmax), pressure impulse (PI) and ignition delay (ID) for the case of constant injection setting. This paper summarizes the results of systematic experiments to determine the cycle-to-cycle variations when the injection timing is changed. In these tests the cycle-to-cycle variations in the maximum cylinder pressure (Pmax), ignition delay (ID), and corresponding pressure impulse (PI) are examined for a single-cylinder test diesel engine at various speeds and compression ratios. Comparisons show that the cycle-to-cycle variations of the diesel engine power output are strongly affected by the injection timing. The best parameter for describing the cycle-to-cycle output variation is shown to depend on the specific engine test condition.

scholarly journals THE EFFECT OF DIESEL-BIODIESEL BLENDS ON THE PERFORMANCE AND EXHAUST EMISSIONS OF A DIRECT INJECTION OFF-ROAD DIESEL ENGINE

Transport ◽  
2014 ◽  
Vol 29 (4) ◽  
pp. 440-448 ◽  
Author(s):  
Tomas Mickevičius ◽  
Stasys Slavinskas ◽  
Slawomir Wierzbicki ◽  
Kamil Duda
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Direct Injection ◽  
Engine Performance ◽  
Exhaust Emissions ◽  
Bench Test ◽  
Maximum Pressure ◽  
Cylinder Pressure ◽  
Biodiesel Blends ◽  
Performance And Emission

This paper presents a comparative analysis of the diesel engine performance and emission characteristics, when operating on diesel fuel and various diesel-biodiesel (B10, B20, B40, B60) blends, at various loads and engine speeds. The experimental tests were performed on a four-stroke, four-cylinder, direct injection, naturally aspirated, 60 kW diesel engine D-243. The in-cylinder pressure data was analysed to determine the ignition delay, the Heat Release Rate (HRR), maximum in-cylinder pressure and maximum pressure gradients. The influence of diesel-biodiesel blends on the Brake Specific Fuel Consumption (bsfc) and exhaust emissions was also investigated. The bench test results showed that when the engine running on blends B60 at full engine load and rated speed, the autoignition delay was 13.5% longer, in comparison with mineral diesel. Maximum cylinder pressure decreased about 1–2% when the amount of Rapeseed Methyl Ester (RME) expanded in the diesel fuel when operating at full load and 1400 min–1 speed. At rated mode, the minimum bsfc increased, when operating on biofuel blends compared to mineral diesel. The maximum brake thermal efficiency sustained at the levels from 0.3% to 6.5% lower in comparison with mineral diesel operating at full (100%) load. When the engine was running at maximum torque mode using diesel – RME fuel blends B10, B20, B40 and B60 the total emissions of nitrogen oxides decreased. At full and moderate load, the emission of carbon monoxide significantly raised as the amount of RME in fuel increased.

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