scholarly journals Development and Validation of a Reduced DME Mechanism Applicable to Various Combustion Modes in Internal Combustion Engines

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Gregory T. Chin ◽  
J.-Y. Chen ◽  
Vi H. Rapp ◽  
R. W. Dibble
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Detailed Mechanism ◽  
Reduced Mechanism ◽  
Hcci Combustion ◽  
Combustion Modes ◽  
Reduced Chemistry ◽  
Wide Range ◽  
Development And Validation

A 28-species reduced chemistry mechanism for Dimethyl Ether (DME) combustion is developed on the basis of a recent detailed mechanism by Zhao et al. (2008). The construction of reduced chemistry was carried out with automatic algorithms incorporating newly developed strategies. The performance of the reduced mechanism is assessed over a wide range of combustion conditions anticipated to occur in future advanced piston internal combustion engines, such as HCCI, SAHCCI, and PCCI. Overall, the reduced chemistry gives results in good agreement with those from the detailed mechanism for all the combustion modes tested. While the detailed mechanism by Zhao et al. (2008) shows reasonable agreement with the shock tube autoignition delay data, the detailed mechanism requires further improvement in order to better predict HCCI combustion under engine conditions.

scholarly journals A research into a gasoline HCCI engine

2010 ◽  
Vol 140 (1) ◽  
pp. 3-13
Author(s):  
Jacek HUNICZ ◽  
Andrzej NIEWCZAS ◽  
Paweł KORDOS
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Injection Timing ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Hcci Combustion ◽  
Permissible Range ◽  
Wide Range ◽  
Gas Recirculation ◽  
Direct Fuel Injection

Homogeneous charge compression ignition (HCCI) is nowadays a leading trend in the development of gasoline internal combustion engines. The application of this novel combustion system will allow to comply with future legislations concerning the exhaust emissions including carbon dioxide. This paper presents a design and implementation of a research engine with a direct fuel injection and the capability of HCCI combustion via an internal gas recirculation and a negative valves overlap (NVO). The technical approach used in the engine allowed an autonomous HCCI operation at variable loads and engine speeds without the need of a spark discharge. Experiments were conducted at a wide range of valve timings providing data which allowed an assessment of a volumetric efficiency and exhaust gas recirculation (EGR) rate. Permissible range of air excess coefficient, providing stable and repeatable operation has also been identified. The use of direct gasoline injection benefited in the improvement of the start of the combustion (SOC) and heat release rate control via the injection timing.

scholarly journals Renewable Pulverized Biomass Fuel for Internal Combustion Engines

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 465
Author(s):  
Ashraf Elfasakhany ◽  
Mishal Alsehli ◽  
Bahaa Saleh ◽  
Ayman A. Aly ◽  
Mohamed Bassuoni
Keyword(s):  
Rate Constants ◽  
Internal Combustion Engines ◽  
Renewable Energy Sources ◽  
Internal Combustion ◽  
Solid Particles ◽  
Combustion Engines ◽  
Modeling Tools ◽  
Wide Range ◽  
New Phenomena ◽  
Powder Combustion

Biomass is currently one of the world’s major renewable energy sources. Biomass in a powder form has been recently proposed as the most encouraging of biomass contours, especially because it burns like a gas. In the current study, biomass powder was examined, for the first time, as a direct solid fuel in internal combustion engines. The aim of the current study was to investigate modeling tools for simulation of biomass powder in combustion engines (CE). The biomass powder applied was in a micro-scale size with a typical irregular shape; the powder length was in the range of 75−5800 μm, and the diameter was in the range 30−1380 μm. Different mechanisms for biomass powder drying and devolatilization/gasification were proposed, including different schemes’ and mechanisms’ rate constants. A comparison between the proposed models and experiments was carried out and results showed good matching. Nevertheless, it is important that a biomass powder simulation addresses overlapping/complicated sub-process. During biomass powder combustion, tar was shown to be formed at a rate of 57 wt.%, and, accordingly, the formation and thermal decomposition of tar were modelled in the study, with the results demonstrating that the tar was formed and then disintegrated at temperatures between 700 and 1050 K. Through biomass powder combustion, moisture, tar, and gases were released, mostly from one lateral of particles, which caused ejection of the solid particles. These new phenomena were investigated experimentally and modeled as well. Results also showed that all the proposed models, along with their rate constants, activation energies, and other models’ parameters, were capable of reproducing the mass yields of gases, tar, and char at a wide range of working temperatures. The results showed that the gasification/devolatilization model 3 is somewhat simple and economical in the simulation/computation scheme, however, models 1 and 2 are rather computationally heavy and complicated.

STAND FOR RUNNING AND TESTING OF LOW POWER MOBILE FARM MACHINERY ENGINES

2016 ◽  
Vol 1 (2) ◽  
pp. 51-53 ◽  
Author(s):  
Иншаков ◽  
Aleksandr Inshakov ◽  
Байков ◽  
Dmitriy Baykov ◽  
Десяев ◽  
...  
Keyword(s):  
Low Power ◽  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
High Energy ◽  
Combustion Engines ◽  
Farm Machinery ◽  
Three Phase ◽  
Wide Range

The purpose of research is to improve the quality of production and repair internal low-power mobile farm combustion engines. To achieve this goal it was suggested to carry out running and testing the engines of small tools and equipment in specialized economical braking stands. The design of such stand, consisting of internal combustion engine, connected crank shaft with asynchronous electric machine with wound rotor, connected to the three-phase network, and matrix converter frequency included in the three-phase electrical network and consisting of nine bidirectional transistor switches, which receive signals space-vector control with automatic control system connected with the test equipment on the basis of a personal computer on which the signals from the sensors mounted on the internal combustion engine is also coming. This stand design for running and testing of internal combustion engines of mobile low power farm machinery is technically easy to manufacture and cost-effective to use. In addition, the design feature of the proposed technical solution is characterized by high energy efficiency and reliability, small dimensions and weight parameters, and wide range of speed control asynchronous machine with wound rotor.

scholarly journals The analysis of an unrepeatability of cylinder pressure signal in internal combustion engines

2005 ◽  
Vol 120 (1) ◽  
pp. 31-39
Author(s):  
Zdzisław CHŁOPEK ◽  
Piotr STASIAK
Keyword(s):  
Normal Distribution ◽  
Internal Combustion Engines ◽  
Engine Speed ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Cylinder Pressure ◽  
Static Properties ◽  
Pressure Signal ◽  
Wide Range ◽  
Static Conditions

In this paper an analysis of irrepeatability of cylinder pressure signal in static conditions of engine work was performed. Large irregularity of analysed signal was stated that follows the irregularity of engine speed and pressure value distortions in each quasi–period. A stationarity of cylinder pressure was studied. Resampling data method in the revolution angle domain was suggested. Due to this synchronised averaging, transformed signal was an effective method of eliminating distortions in the basic periodical signal. Static properties of signal deviations (deviations of cylinder pressure from pressure averaged in quasi–periods) were studied. It was stated that the analysed distortions are a wide–range noise and there is no reason to formulate a hypothesis regarding the analysed signal conformity with a normal distribution.

Modernization of the KI-1363-V stand for running-in and testing of internal combustion engines

2020 ◽  
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Test Bench ◽  
Combustion Engine ◽  
Educational Institution ◽  
Internal Combustion ◽  
Educational Process ◽  
Combustion Engines ◽  
Electronic Control ◽  
Wide Range

Today, stands for running in and testing internal combustion engines are actively used both at car service enterprises and in the educational process of specialized specialties of educational institutions. The article analyzes the stand KI-1363-V, installed on the basis of the department of technical service and repair of machines of the Federal State Budgetary Educational Institution of Higher Education of the Perm State Technical University, proposed and implemented measures for its modernization. In addition, a review of analogues on the market was carried out, as a result of which it was established that the purchase of a ready-made complex for testing internal combustion engines is economically unjustified. In the course of the work, a hardware and software complex (HSC) was developed and implemented, which allows automating the processes of taking performance characteristics from the engine under test and reducing the measurement error in order to increase the efficiency of using the test bench. In addition, the article describes the work carried out on the modernization of the test engine, implemented an engine management system with distributed fuel injection and electronic control. The electronic control unit for the engine and the stand and the specialized software "APK of the KI-1363-V stand" have been developed, which, in conjunction with the EFI Analytics TunerStudio software product, allows to implement a wide range of research and laboratory work related to tuning and characterizing the tested internal combustion engine... Keywords internal combustion engine, ICE test bench, ICE load characteristic, engine performance indicators

scholarly journals An Investigation into the Acoustic Emissions of Internal Combustion Engines with Modelling and Wavelet Package Analysis for Monitoring Lubrication Conditions

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 640 ◽  
Author(s):  
Nasha Wei ◽  
James Gu ◽  
Fengshou Gu ◽  
Zhi Chen ◽  
Guoxing Li ◽  
...  
Keyword(s):  
High Performance ◽  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Acoustic Emissions ◽  
Internal Combustion ◽  
Power Stroke ◽  
Combustion Engines ◽  
Wide Range ◽  
Wavelet Package Analysis ◽  
Lubrication Conditions

Online monitoring of the lubrication and friction conditions in internal combustion engines can provide valuable information and thereby enables optimal maintenance actions to be undertaken to ensure safe and efficient operations. Acoustic emission (AE) has attracted significant attention in condition monitoring due to its high sensitivity to light defects on sliding surfaces. However, limited understanding of the AE mechanisms in fluid-lubricated conjunctions, such as piston rings and cylinder liners, confines the development of AE-based lubrication monitoring techniques. Therefore, this study focuses on developing new AE models and effective AE signal process methods in order to achieve accurate online lubrication monitoring. Based on the existing AE model for asperity–asperity collision (AAC), a new model for fluid–asperity shearing (FAS)-induced AE is proposed that will explain AE responses from the tribological conjunction of the piston ring and cylinder. These two AE models can then jointly demonstrate AE responses from the lubrication conjunction of engine ring–liner. In particular, FAS allows the observable AE responses in the middle of engine strokes to be characterised in association with engine speeds and lubricant viscosity. However, these AE components are relatively weak and noisy compared to others, with movements such as valve taring, fuel injection and combustions. To accurately extract these weaker AE’s for lubricant monitoring, an optimised wavelet packet transform (WPT) analysis is applied to the raw AE data from a running engine. This results in four distinctive narrow band indicators to describe the AE amplitude in the middle of an engine power stroke. Experimental evaluation shows the linear increasing trend of AE indicator with engine speeds allows a full separation of two baseline engine lubricants (CD-10W30 and CD-15W40), previously unused over a wide range of speeds. Moreover, the used oil can also be diagnosed by using the nonlinear and unstable behaviours of the indicator at various speeds. This model has demonstrated the high performance of using AE signals processed with the optimised WPT spectrum in monitoring the lubrication conditions between the ring and liner in IC engines.

scholarly journals Introduction of HCCI for Hydrogen Fuel Engines

2020 ◽  
pp. 127-132
Author(s):  
Chuanhao Zhao ◽  
Yang Luo
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Homogeneous Charge Compression Ignition ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Compression Ignition ◽  
Hydrogen Fuel ◽  
Advantages And Disadvantages ◽  
Hcci Combustion

This paper is a brief review of the homogeneous charge compression ignition (HCCI) model for hydrogen-fueled internal combustion engines based on an analysis of the advantages and disadvantages of hydrogen internal combustion engines and HCCI combustion. It found that HCCI can be realized in a hydrogen-fueled internal combustion engine, meanwhile the HCCI can effectively reduce the emission of hydrogen internal combustion engine.

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