CFD of Thermal System for Euro VI Bus Engine

Wrights Group Ltd.生产英国最省油的单层和双层巴士。在过去的四年里，WrightBus专注于提高传统汽车的燃油经济性。对更环保的车辆的高需求导致了更复杂的发动机系统技术的引入。事实上，车辆的动力单元从基于内燃机（ICE）的单一形式的车辆推进向包括更多电气部件的混合动力系统过渡。继续提高燃油经济性的一个重要因素是更深入地了解车辆的热管理。车辆热管理系统在安全性、可靠性、性能和乘客舒适性方面至关重要。为了满足当前和未来的排放标准，后处理系统必须保持在一定温度以上。当前低于该温度需要燃料在后处理系统内燃烧。这相当于一个显着的燃油经济性的惩罚。现在有一个完整的和详细的CFD模型的轻度混合动力常规巴士的发动机热系统的需要。该模型可用于评估模拟驾驶环境中的热性能和燃油经济性，本项目的目的是开发一个数值模型，该模型能够研究欧VI客车发动机的传热特性和热系统的细节，以实现最佳的热管理策略。该模型将基本上看到动力系统分解为元素，使我们能够预测发动机部件中的热点发动机舱。通过对每个主要部件的分析获得的有价值的信息将用于调查放置在发动机罩内的热力学系统的相关性。该模型将在各种驾驶和环境条件下进行测试。该项目涉及与QUB Wrights Group技术中心的热分析团队以及Wrights Group Ltd.的开发团队密切合作，以创建和验证模型。该模型将用于优化控制策略，并在长期燃油经济性技术道路上规划未来产品开发。

The Wrights Group Ltd. produces the most fuel efficient single and double deck buses in the UK. Over the past four years, WrightBus have focused on improving conventional vehicle fuel economy. The high demand for more environmentally friendly vehicles has led to the introduction of more complex engine system technologies. In fact, the vehicle's power unit transitions from a single form of vehicle propulsion based on internal combustion engine (ICE) toward a hybrid system that includes more electrical components.A significant factor in continuing to improve fuel economy is to gain a deeper understanding of the vehicles thermal management. Vehicle thermal management systems are critical in terms of safety, reliability, performance and passenger comfort. To meet current and future emissions standards, the aftertreatment systems must be maintained above a certain temperature. Currently falling below this temperature requires fuel to be combusted within the aftertreatment system. This amounts to a significant fuel economy penalty.There is now a need for a complete and detailed CFD model of the engine thermal system of a mild hybridised conventional bus. Such a model can be used to evaluate thermal and therefore fuel economy performance in a simulated driving environment.The aim of this project is to develop a numerical model which is able to investigate the details of the heat transfer characteristics and thermal system in a Euro VI bus engine to achieve an optimum thermal management strategy. The model would essentially see the powertrain broken down into elements that would enable us to predict the hot spots in the engine components the engine bay. Valuable information achieved by the analysis of each of the main components will be used to investigate the relevance of the thermodynamic systems placed in the underhood. The model will be tested in various driving and environmental conditions. This project involves working closely with the Thermal Analysis team within the Wrights Group Technical Centre at QUB and with the development team at Wrights Group Ltd. to create and validate the model. The model will then be used to optimise the control strategy and to plan for future product development within the long term fuel economy technology road.