In this paper, the working process mathematical models of in-cylinder of the diesel engine, exhaust turbocharger and intercooler are established, as well as the simulating model using simulation Software GT-POWER. Through parameters modification, we built the Map of efficiency characteristic curve of compressor and turbocharger. Targeted at the turbocharged intercooled diesel engine of YC4F92 type, simulating calculation and experimental verification are conducted. It turned out that the simulating value and experimental value matches well and the maximum error value is not more than 5%, which demonstrated the accuracy and reliability of the established model. The established model can works as a tool for the design and optimization of diesel engine.
By using some types of means such as Optical Microscope (OM), Scanning Electron Microscopy(SEM), the testing of tensile mechanical properties and the testing of friction and wear, the impacts of the Al-5Ti-1B and Al-20Sr modification on the Al-16Si-4Cu-0.5Mg-0.2Mn alloy microstructure, mechanical properties and friction properties are researched. The results turn out that the modification can significantly refine the primary silicon and the eutectic silicon in the alloy, the Al-5Ti-1B mainly refined the primary silicon in the alloy, the Al-20Sr refined the eutectic silicon; the alloy’s effect of refinement after compound modification is better than that in separate metamorphism. Modification can improve the tensile strength and elongation of the alloy: the tensile strength of the alloy has been increased by 65MPa after its compound modification; also the elongation by 0.4%. Modification can improve wear-resisting property of the alloy and also its effect of compound modification is better than that of separate metamorphism. The modification mechanism of Al-5Ti-1B is that Al3Ti and TiB2 belongs to heterogeneous nucleation; while the modification mechanism of Al-20Sr is that the strontium changes the growth pattern of Si phase.
In this paper, the mathematical model of plate fin type intercooler in turbocharged natural gas engine (NGE) is established. The main parameters of the intercooler, such as fin form and geometry parameters, the cross-sectional area of channel and area of heat exchange, the channel number and arrangement, the intercooler core size are simulated. The 3D model of the intercooler is established and the pressure loss is checked based on the simulation results. The assembly test results of the intercooler and NGE show that the errors of the design value and the test value of all parameters are not more than 5%, which shows that the plate fin type intercooler designed meets the design requirements.
In the paper, the natural gas engine (NGE)model based on AVL BOOST software is built and simulated. The simulation value and experiment value coincide, showing that the NGE model is correct and reasonable. On this basis, the model has been used to analyze the effect of the key parameters, such as compression ratio, ignition advance angle, valve timing, supercharging ratio on the engine power, maximum combustion pressure, exhaust temperature, the maximum rise rate of pressure. Combined with the relevant theories of engine, the value ranges of the key parameters can be designed. The research achievement is valuable in the development and optimization matching of the NGE.
As a core component of a turbocharger, the efficiency of compressor directly affects its overall efficiency. The finite element model and mesh model of JQ40A turbocharger impeller is built by using Software Numeca in this paper. The compressor efficiency and the flow field with different inlet blade angle, the pressure surface boundary layer with different blade thickness are simulated in the case of the same outlet angle, throat area of and number of the blades. The result of the simulation and research shows that it is the inlet blade angle of 51.40 degrees and the average blade thickness of 0.5mm that make it the best design with highest efficiency .
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