Papers by Author: Zhao Cheng Yuan

Abstract: Today CFD is an important tool for engineers in the automotive industry. To simulate and optimize the fluid flow and heat transfer in the engine, the research is carried out. The geometric models of a gasoline engine and the cooling water jacket are simplified by Pro/E software firstly. Then solid - liquid coupled heat transfer analysis is done by using CFD software FLUENT. Temperature field distributions in the engine body and the cooling water jacket are obtained. An engine temperature test bench is set up, on which temperature values of key points are measured. The analysis on the errors between the experimental data and the calculation results shows that the temperature distributions in the engine are reasonable and the cooling performance of the water jacket meets the design requirements. The deviations between the experimental data and calculated values on the measuring points are not big, so the calculation method has high accuracy. The data obtained in this experiment can be used as the basis in the following study.

Abstract: For developing free-piston diesel engine, The two stroke Reverse-Loop scavenging diesel engine E150 was taken as the prototype and a simplified model was built by using CATIA software. Based on the influence of different factors about the gas exchange process，several layouts of scavenging air belt to be built in different schemes. Then the influence of the main structure parameters of scavenging air belt to the gas exchange process were analyzed and a better scheme of structural parameters was obtained.

Abstract: Tortional vibration is a common phenomena in the rotary machine such as internal combustion engine. The measurement of tortional vibration is an usual test in the engine experiments. In this paper, the influences of some parameters of measurement instruments such as teeth number and diameter of gear wheel were investigated by experiment approach. Some useful results to guarantee the precision of measurement were obtained.