Flow and pressure simulation of cooling water,lubricating oil and fuel supply systems
When designing fluid systems for 4- stroke medium speed diesel engines it is beneficial to use modern simulation tools to achieve an optimized design in an early phase. Today’s engines have become very compact and typically have a high degree of integration of fluid channels into castings. Therefore, changes to address flow problems after design is complete will require big re-design efforts and should be avoided. The heat balance of the engine determines the needed cooling water flow to achieve sufficient cooling without excessive temperature increase in the water. As the pumps used are of centrifugal type the flow in the system is determined by the system pressure drop. CFD simulation of complicated channeling as part of the design phase will ensure unnecessary pressure drop is avoided and thus the water flow through the system will be increased. A welldesigned cooling system will have the majority of the pressure drop in coolers and as little as possible in the channels and piping. Oil pumps for 4-stroke diesel engines must be dimensioned to ensure sufficient pressure is available in the critical components at all conditions. Over-dimensioning of the oil pump will lead to unnecessary oil flow wasted through the pressure control valve. To determine the exact oil flow through the engine in the design phase is difficult, as the oil system has many consumers with different characteristics. 1- D flow simulation of a complete oil system gives a sufficiently accurate prediction of the needed flow to avoid over- or under-dimensioning of the oil pump and avoid excessive pressure drop in any part of the oil system. Pressure pulsation from mechanical fuel pumps to the fuel supply line can be a source for vibration both on the engine itself but also in the external fuel piping of the installation, e.g. ship. By 1D-simulations of the fuel supply system the pulsation can be predicted and the need for damping can be determined. This paper presents successful simulation projects of all the above mentioned systems.
Andreas Hjort Juhani Ervasti Jaakko Koivula Lars Ola Liavag Alexandre Pereira Antonino Di Miceli
W(a)rtsil(a),Finland
国际会议
上海
英文
1-7
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）