【作者】

Gareth Estebanez

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。ABSTRACT Abstract: Manufacturers of medium speed engines worldwide are faced with increasing challenges. The proliferation of natural gas, driven by advantageous fuel prices, emissions benefits and ready availability has driven the demand for sea transportation of the gas itself and for gas-fuelled marine engines. End users of the engines are demanding flexibility in the use of liquid or gaseous fuels while at the same time the engine manufacturers must commonise their products to reduce costs and increase competitiveness in an increasingly challenging market. Anqing CSSC Diesel Engine Co. Ltd (ACD) partnered with AVL List GmbH (AVL) to design a new spark ignited (SI) gas and a new Dual Fuel (DF) medium speed engine platform for marine propulsion applications. The engines were to use a common design as much as possible, with differences between the two kept to an absolute minimum necessitated by the combustion concepts: The SI-Gas Engine is a Pre-Chamber Spark Ignition (PCSI) concept. The Dual Fuel (DF) engine uses a Main Injector and a Micro Pilot Injector. This paper will describe the design approach used for the selected combustion concepts and the design methodology used to achieve a high degree of commonality between the SI-Gas and the DF engines. The SI-Gas engine was designed to be IMO III compliant. The dual fuel engine was designed to be IMO III emissions capable when operating in Gas mode and IMO II emissions capable when operating in Diesel (MDO, HFO) mode. The paper will discuss how a combination of thermodynamic calculations and existing engine development experience was used to determine the optimum engine performance and emissions architecture. The paper will describe key design elements of the new engine platform and the differentiating features between the SI-gas and DF engines will be discussed. Advanced CAE analysis were used in conjunction with the design of the engines to ensure the engines were optimised for functionality and operational efficiency. This approach will be described in some detail for the cylinder head design, where there was a challenging requirement to integrate the combinations of main and micro-pilot injectors and SI pre-chamber together with optimal port geometries and also maintaining sufficient structural strength and cooling. At the time of writing, the prototype engines were in the procurement & assembly phase therefore this paper will only focus on the design and analysis phase.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

3

返回