| It is very important to solve the engine cooling system problem in order to meet the requirements of the higher performance, durability and fuel economy. The cooling system is the important constituent of diesel engine, but the cooling jacket is playing the very important role in the cooling system, it affects the overall performance of diesel engine directly. Mainly uses the experimental study and the value simulation the diesel engine cooling jacket internal flow field distribution research simulates two methods. Three dimensional value simulation CFD (Computational Fluid Dynamics) has the characteristics of lowly design cost, the cycle short and so on, is the important method to researching diesel engine cooling jacket performance.This article take the Turbo-charged cold diesel engine cooling jacket as the object of study, first has designed the reasonable experiment plan to surveying cooling jacket current of water, have carried on the test to the current capacity of cooling jacket entrance and the temperature,the pressure of some characteristic point, which puts on the preliminary analysis to the diesel engine cooling water and makes the appraisal to the test result, and also provides the accurate boundary condition to the CFD computation .Then has established the cooling jacket flow field geometry model using three dimensional CAD software, In this foundation applies the FIRE of AVL Corporation software, has carried on the CFD computation to this diesel engine cooling jacket, Had demonstrated the water jacket internal flowing, simultaneously uses the flow field information which obtains from the CFD computation carries on the analysis to in the engine water jacket refrigerant flow field, provides the instruction for the water jacket design improvement. Through to the internal combustion engine cooling jacket three dimensional CFD value simulation, obtained the massive water jacket flow field information, for instructs this section diesel engine cooling jacket the improvement and the development design provides certain theory basis. May know this four cylinder diesel engine cooling of design quite to be reasonable jacket by the analog computation analysis, and can meet the the cooling effect that design requirements, but also has the place which needs some optimize, Mainly displays the speeds flow in the four cylinder water jack of cylinder covert is quite low, about the cylinder body water jacket the speed of flow is non-uniform, Finally according to the computed result to the water jacket structure has carried on the optimization, the plan is that uses expands four jars to cover the water pore in the aperture and the increase the water pore, as well as the increase water jacket always enters the water pore, enables the cooling jacket to achieve the good cooling effect. |
