Yongqi Liu

An Oxygenating Additive for Reducing the Emission of Diesel Engine

Oxygenated diesel fuel blends have a potential to reduce the emission of particulate matter (PM) and to be an alternative to diesel fuel. This paper describes a new kind of oxygenate additive, ethylene glycol monoacetate (EGM), and its effects on the characteristics of performance and emission of a compression ignition engine. The results show that the engine power outputs decrease and the BSFC increase when the diesel engine fueled with blends, but the diesel equivalent BSFC decrease. The results also indicate that all oxygenated fuels tested in this study show a beneficial effect on reducing smoke emissions at the operation conditions compared with diesel fuel. With the EGM15, an average smoke reduction of 49.9% and a maximal smoke reduction of 71% are obtained. The blends have little effects on the NOx emissions at most loads. The CO emissions of the EGM- diesel blends decrease obviously at high load. All these results indicate the potential of EGM-diesel blend for clean combustion in diesel engine.

Stress and Fatigue of Connecting Rod in Light Vehicle Engine

The connecting rod (CR) is the main moving parts and an important component of engine. If the reliability is not strong enough, fatigue failure of the CR would occur, thereby leading to component fracture and engine failure. So much so that CR fracture. It will lead to engine fault as well as serious outcome. In this paper, stress distribution and fatigue life of CR in light vehicle engine were analyzed using the commercial 3D finite element software, ANSYS TM . The results showed that the medial surface of small end will be the critical surface whereby damage will initiate at the maximum stretch condition. The maximum stress and deformation values are 190.23 MPa and 0.0507mm respectively. The critical location is at the transition region between the big end and connecting shank at maximum compression condition. The maximum stress and deformation values are 459.21 MPa and 0.0702283 mm respectively. Safety factor is 1.584. In order to increase the reliability of CR, some improvement is carried out. Safety factor of CR increases by 59%.

Intension Analysis of 3-D Finite Element Analysis on 380 Diesel Crankshaft

Crankshaft is one of the most important parts in internal combustion engine. In this paper, a three-dimension model of 380 diesel engine crankshaft was created through Pro/ENGINEER software. The finite element analysis (FEM) software ANSYS was used to analyze the distortion and stress status of the crankshaft. First of all, the 380 diesel engine entity crankshaft model was created by Pro/ENGINEER software. Next, the model of crankshaft created by Pro/E software was imported to ANSYS software. Then, material properties, constraints boundary conditions and mechanical boundary conditions of the 380 diesel engine crankshaft were determined. Finally, the strain and stress figures of 380 diesel engine crankshaft were calculated, combined with maximum stress point and the dangerous area. Then this article checked the crankshafts static strength and the fatigue evaluations which provide valuable theoretical foundation for the optimization and improvement of engine design.

Experimental Investigations on Combustion Characteristics of the Blast Furnace Gas

Blast furnace gas emitted from smelting steel production process is harmful to human health and the ecological environment. It can be used as fuel for engines to generate electricity for most middle and small steel enterprises. Premixed laminar combustion experiments of the blast furnace gas-air mixture were performed in the constant volume combustion bomb in this paper. The results indicate that the combustion velocity increases when the equivalence ratio is close to the academic air-fuel-ratio (Phi = 1.0), and the maximum appears at the equivalence ratio of 1.15. Premixed laminar burning velocity of the blast furnace gas-air mixture decreases with increase in the initial pressure, and it increases with rising of initial temperature. An increase of the amount of combustible gas in various components blast furnace gas can augment the numerical value of the laminar burning velocity and help to combustion.

Combustion of Coal Mine Ventilation Air Methane in Thermal Reverse-Flow Reactor

Combustion of coal mine ventilation air methane (VAM) was investigated in a thermal reverse-flow reactor. Effects of CH 4 concentration, VAM flow and temperature were studied. The results show that combustion of coal mine ventilation air methane be achieved for methane concentration of 0.2%~0.8% in reactor. The conversion rates of CH 4 are all above 99%.Some heat could be recovered. With the increase of CH 4 concentration and VAM flow, the temperature of middle area increase, the volume of high temperature increase. It is to improve conversion rate of CH 4 . The lowest combustion temperature is 880degC.

Experimental Investigation of Flow Resistance in a Coal Mine Ventilation Air Methane Preheated Catalytic Oxidation Reactor

This paper reports the results of experimental investigation of flow resistance in a coal mine ventilation air methane preheated catalytic oxidation reactor. The experimental system was installed at the Energy Research Institute of Shandong University of Technology. The system has been used to investigate the effects of flow rate (200 Nm3/h to 1000 Nm3/h) and catalytic oxidation bed average temperature (20°C to 560°C) within the preheated catalytic oxidation reactor. The pressure drop and resistance proportion of catalytic oxidation bed, the heat exchanger preheating section, and the heat exchanger flue gas section were measured. In addition, based on a large number of experimental data, the empirical equations of flow resistance are obtained by the least square method. It can also be used in deriving much needed data for preheated catalytic oxidation designs when employed in industry.

3-D Finite Element Analysis on 480 Diesel Crankshaft

Finite element analysis has been used to investigate the vibration modal of 480 crankshaft and the stress analysis of crankpin. The aim of the modal analysis was to explain the relationship between the frequency and the vibration modal. And the aim of the stress analysis of crankpin was to find the maximum deformation and maximum stress point. In this paper, three-dimension models of 480 diesel engine crankshaft and crankpin were created through Pro/ENGINEER software. The finite element analysis (FEM) software ANSYS was used to analysis the vibration modal and the distortion and stress status of the crankpin. The results of crankshaft vibration modal were calculated. And the stress figures of 480 diesel engine crankpin were calculated, combined with maximum stress point and the dangerous area. The results would provide valuable theoretical foundation for the optimization and improvement of engine design.

Research on Opening Modular Experiment Teaching in Pyrology Elements Based on Network Resources

Cultivating innovative talents is an important task of colleges and universities. It is the trend of higher education development and the need of social development. Experiment teaching is an important link to develop students’ practice ability as well as innovative ability and the opening modular experiment teaching is an effective way to train innovative talents. The content, conduct, effect and significance of opening modular experiment teaching were studied in detail basicd on modular experiment course of pyrology.

Finite Element Analysis of Tractor Diesel Engine Connecting Rod

In this paper, with the ANSYS, stress distribution and safety factor of connecting rod were analyzed by using 3D finite element method. The results show that the inner surface of the transition location of big end and connecting rod shank is the exposed destructive position at maximum stretch condition. Maximum stress value is 118 MPa. Safety factor is 2.99. The exterior surface of the transition location of small end and connecting rod shank is the exposed destructive position at maximum compression condition. Maximum stress value is 127 MPa. Safety factor is 2.77.

Finite Element Analysis of Pump Diesel Engine Connecting Rod

In this paper, with the ANSYS, stress distribution of pump diesel engine connecting rod were analyzed by using 3D finite element method. The results show that the oil-hole of small end of connecting rod shank is the exposed destructive positions at maximum compression condition and maximum stretch condition. Maximum stress value is 371 MPa at maximum compression condition. Maximum deformation value is 0.149mm. Maximum stress value is 69.4MPa at maximum stretch condition. Maximum deformation value is 0.0168mm.