The Effect of Training Conditions on the Accuracy of In-cylinder Pressure Prediction DNN Model Using Engine Block Vibration in a CNG-Diesel Dual Fuel Engine

This paper presents research on the combustion and emission characteristics of a four-stroke Natural gas–Diesel dual-fuel marine engine at full load. The AVL FIRE R2018a (AVL List GmbH, Graz, Austria) simulation software was used to conduct three-dimensional simulations of the combustion process and emission formations inside the engine cylinder in both diesel and dual-fuel mode to analyze the in-cylinder pressure, temperature, and emission characteristics. The simulation results were then compared and showed a good agreement with the measured values reported in the engine’s shop test technical data. The simulation results showed reductions in the in-cylinder pressure and temperature peaks by 1.7% and 6.75%, while NO, soot, CO, and CO2 emissions were reduced up to 96%, 96%, 86%, and 15.9%, respectively, in the dual-fuel mode in comparison with the diesel mode. The results also show better and more uniform combustion at the late stage of the combustions inside the cylinder when operating the engine in the dual-fuel mode. Analyzing the emission characteristics and the engine performance when the injection timing varies shows that, operating the engine in the dual-fuel mode with an injection timing of 12 crank angle degrees before the top dead center is the best solution to reduce emissions while keeping the optimal engine power.

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Comparative assessment of engine vibration, combustion, performance and emission characteristics between single and twin-cylinder diesel engines in unifuel and dual-fuel mode

Journal of Energy Resources Technology ◽

10.1115/1.4052998 ◽

2021 ◽

pp. 1-39

Author(s):

Akash Chandrabhan Chandekar ◽

Sushmita Deka ◽

Biplab K. Debnath ◽

Ramesh Babu Pallekonda

Keyword(s):

Natural Gas ◽

Alternative Fuels ◽

Load Condition ◽

Alternative Fuel ◽

Dual Fuel ◽

Cylinder Pressure ◽

Compressed Natural Gas ◽

Single Cylinder ◽

Engine Vibration ◽

Single Cylinder Engine

Abstract The persistent efforts among the researchers are being done to reduce emissions by the exploration of different alternative fuels. The application of alternative fuel is also found to influence engine vibration. The present study explores the potential connection between the change of the engine operating parameters and the engine vibration pattern. The objective is to analyse the effect of alternative fuel on engine vibration and performance. The experiments are performed on two different engines of single cylinder and twin-cylinder variants at the load range of 0 to 34Nm, with steps of 6.8Nm and at the constant speed of 1500rpm. The single cylinder engine, fuelled with only diesel mode, is tested at two compression ratios of 16.5 and 17.5. While, the twin-cylinder engine with a constant compression ratio of 16.5, is tested at both diesel unifuel and diesel-compressed natural gas dual-fuel modes. Further, in dual-fuel mode, tests are conducted with compressed natural gas substitutions of 40%, 60% and 80% for given loads and speed. The engine vibration signatures are measured in terms of root mean square acceleration, representing the amplitude of vibration. The combustion parameters considered are cylinder pressure, rate of pressure rise, heat release rate and ignition delay. At higher loads, the vibration amplitude increases along with the cylinder pressure. The maximum peak cylinder pressure of 95bar is found in the case of the single cylinder engine at the highest load condition that also produced a peak vibration of 3219m/s2.

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Closed-loop control of a dual-fuel engine working with different combustion modes using in-cylinder pressure feedback

International Journal of Engine Research ◽

10.1177/1468087419835327 ◽

2019 ◽

Vol 21 (3) ◽

pp. 484-496 ◽

Cited By ~ 2

Author(s):

Carlos Guardiola ◽

Benjamín Pla ◽

Pau Bares ◽

Alvin Barbier

Keyword(s):

Closed Loop ◽

Combustion Engine ◽

Fuel Combustion ◽

Operating Conditions ◽

Dual Fuel ◽

Maximum Pressure ◽

Cylinder Pressure ◽

Pressure Derivative ◽

Combustion Modes ◽

Dual Fuel Combustion

This work presents a closed-loop combustion control concept using in-cylinder pressure as a feedback in a dual-fuel combustion engine. At low load, reactivity controlled compression ignition combustion was used while a diffusive dual-fuel combustion was performed at higher loads. The aim of the presented controller is to maintain the indicated mean effective pressure and the combustion phasing at a target value, and to keep the maximum pressure derivative under a limit to avoid engine damage in all the combustion modes by cyclically adapting the injection settings. Various tests were performed at steady-state conditions showing good abilities to fulfil the expected operating conditions but also to reject disturbances such as intake pressure or exhaust gas recirculation variations. Finally, the proposed control strategy was tested during a load transient resulting in a combustion switching-mode and the results exhibited the closed-loop potential for controlling such combustion concept.

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Cylinder Specific Pressure Predictions for Advanced Dual Fuel Compression Ignition Engines Utilizing a Two-Stage Functional Data Analysis

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4042252 ◽

2019 ◽

Vol 141 (5) ◽

Author(s):

Xiao Huang ◽

Lulu Kang ◽

Mateos Kassa ◽

Carrie Hall

Keyword(s):

Combustion Process ◽

Operating Parameter ◽

Combustion Model ◽

Dual Fuel ◽

Compression Ignition ◽

Cylinder Pressure ◽

Specific Pressure ◽

Compression Ignition Engine ◽

Two Stage ◽

Pressure Trace

In-cylinder pressure is a critical metric that is used to characterize the combustion process of engines. While this variable is measured on many laboratory test beds, in-cylinder pressure transducers are not common on production engines. As such, accurate methods of predicting the cylinder pressure have been developed both for modeling and control efforts. This work examines a cylinder-specific pressure model for a dual fuel compression ignition engine. This model links the key engine input variables to the critical engine outputs including indicated mean effective pressure (IMEP) and peak pressure. To identify the specific impact of each operating parameter on the pressure trace, a surrogate model was produced based on a functional Gaussian process (GP) regression approach. The pressure trace is modeled as a function of the operating parameters, and a two-stage estimation procedure is introduced to overcome various computational challenges. This modeling method is compared to a commercial dual fuel combustion model and shown to be more accurate and less computationally intensive.

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dual-fuel engine with cylinder pressure based control

MTZ industrial ◽

10.1007/s40353-013-0094-5 ◽

2013 ◽

Vol 3 (2) ◽

pp. 14-23 ◽

Cited By ~ 1

Author(s):

Bert Ritscher

Keyword(s):

Dual Fuel ◽

Cylinder Pressure

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Capturing Pressure Oscillations in Numerical Simulations of Internal Combustion Engines

Journal of Energy Resources Technology ◽

10.1115/1.4039630 ◽

2018 ◽

Vol 140 (8) ◽

Cited By ~ 5

Author(s):

Sreenivasa Rao Gubba ◽

Ravichandra S. Jupudi ◽

Shyam Sundar Pasunurthi ◽

Sameera D. Wijeyakulasuriya ◽

Roy J. Primus ◽

...

Keyword(s):

Internal Combustion Engines ◽

Fuel Combustion ◽

Dual Fuel ◽

Combustion Engines ◽

Cylinder Pressure ◽

Pressure Oscillations ◽

Numerical Predictions ◽

Medium Speed ◽

Dual Fuel Combustion ◽

The Mean

In an earlier publication (Jupudi et al., 2016, “Application of High Performance Computing for Simulating Cycle-to-Cycle Variation in Dual-Fuel Combustion Engines,” SAE Paper No. 2016-01-0798), the authors compared numerical predictions of the mean cylinder pressure of diesel and dual-fuel combustion, to that of measured pressure data from a medium-speed, large-bore engine. In these earlier comparisons, measured data from a flush-mounted in-cylinder pressure transducer showed notable and repeatable pressure oscillations which were not evident in the mean cylinder pressure predictions from computational fluid dynamics (CFD). In this paper, the authors present a methodology for predicting and reporting the local cylinder pressure consistent with that of a measurement location. Such predictions for large-bore, medium-speed engine operation demonstrate pressure oscillations in accordance with those measured. The temporal occurrences of notable pressure oscillations were during the start of combustion and around the time of maximum cylinder pressure. With appropriate resolutions in time steps and mesh sizes, the local cell static pressure predicted for the transducer location showed oscillations in both diesel and dual-fuel combustion modes which agreed with those observed in the experimental data. Fast Fourier transform (FFT) analysis on both experimental and calculated pressure traces revealed that the CFD predictions successfully captured both the amplitude and frequency range of the oscillations. Resolving propagating pressure waves with the smaller time steps and grid sizes necessary to achieve these results required a significant increase in computer resources.

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A novel combustion evaluation method based on in-cylinder pressure traces for diesel/natural gas dual fuel engines

Energy ◽

10.1016/j.energy.2016.09.030 ◽

2016 ◽

Vol 115 ◽

pp. 1130-1137 ◽

Cited By ~ 10

Author(s):

Zhongshu Wang ◽

Wenjing Chen ◽

Dan Wang ◽

Manzhi Tan ◽

Zhongchang Liu ◽

...

Keyword(s):

Natural Gas ◽

Evaluation Method ◽

Dual Fuel ◽

Cylinder Pressure ◽

Dual Fuel Engines

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Cyclic Pressure Variations in A Small Diesel Engine Fueled with Biodiesel and Antioxidant Blends

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.17.2.2020.04.0585 ◽

2020 ◽

Vol 17 (2) ◽

pp. 7851-7857

Author(s):

M.H. Ali ◽

A. Abdullah ◽

M.H. Mat Yasin ◽

M.K. Kamarulzaman

Keyword(s):

Diesel Engine ◽

Engine Speed ◽

Load Condition ◽

Combustion Characteristics ◽

Dual Fuel ◽

Biodiesel Fuel ◽

Cylinder Pressure ◽

Indicated Mean Effective Pressure ◽

Engine Combustion ◽

Cyclic Variations

Biodiesel fuel is considered as one of the most competence sustainable replacement for fossil fuel due to their superior combustion characteristics and possesses higher oxygen content. Thus, many researchers recently investigated to improve biodiesel capability by adding additives whether by blending with dual-fuel or tri-fuel. However, the combustion characteristics for biodiesel and biodiesel-additives blends are not thoroughly examined and need additional research works to study how the biodiesel behaviour and characterise. Thus, this research main objective is to study a single-cylinder diesel engine cyclic cylinder pressure variations running with biodiesel with antioxidant (B2HA1.0 and B2HT 1.0) blends with palm oil methyl ester (POME). While The baseline fuels used for this study were biodiesel (B20) and pure diesel (B0). The entire test fuels were examined at a constant engine speed 1800 rpm with 100% engine load condition. The engine combustion characteristics were studied by utilising the indicated mean effective pressure (IMEP) and cyclic variations of combustion pressure at 200 consecutive cycles. Combustion characteristics of engine diesel have been studied by using statistical analysis. The results revealed that the engine running with biodiesel-antioxidants have higher cyclic variations of combustion from B20 and B0, which B2HA1.0 possessed the highest cyclic variations. It can be summarised from the study that biodiesel-antioxidants fuels produce a substantial influence on the engine cyclical variation, which linked to the characteristics of the engine combustion.

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Combustion and Performance Analysis of a Dual-fuel Diesel Engine Using Producer Gas

10.21203/rs.3.rs-255085/v1 ◽

2021 ◽

Author(s):

Pradipta Kumar Dash ◽

Shakti Prakash Jena ◽

Harish Chandra Das

Keyword(s):

Diesel Engine ◽

Performance Analysis ◽

Heat Release ◽

Alternative Energy ◽

Dual Fuel ◽

Producer Gas ◽

Cylinder Pressure ◽

Gas Temperature ◽

Suitable Alternative ◽

And Performance

Abstract The researchers around the globe are trying to overcome energy crisis by developing suitable alternative energy source. In this work, combustion and performance analysis of a diesel engine was studied running in dual-fuel mode using producer gas. The experiment shows lower engine performance like brake thermal efficiency, increased brake specific fuel consumption and exhaust gas temperature in dual-fuel run as compared to diesel alone run. Combustion characteristics like cylinder pressure, mass fraction burned, mean combustion temperature and net heat release were also found to be deteriorated in presence of producer gas. The peak value of cylinder pressure and net heat release were noticed slightly away from the top dead center. The experimentation indicates that combustion improving techniques should be employed to enhance the performance of the dual-fuel engine to run with producer gas.

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