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Technical Paper

A Study of the Transient Analysis Technique on the Under Hood Thermal Damage

Vehicle engine cooling and under-floor heat protection is very important at the early stage of vehicle development. Nowadays, numerical analysis in this area is very common. Engineers can decide the radiator and bumper opening area, fan and radiator size by engine room airflow and temperature distribution analysis. At the same time, the results also can be used to prove effective heat protection method for the vulnerable components around the exhaust manifold and pipe. But, solving both cases at the same time is considered as very difficult because of large analysis domain, complicate model and very long solving time. The study provides an effective method for analysis the engine cooling and heat damage by two-way coupling between CFD code Star-CCM+ and a special heat transfer program RadTherm. Especially, the study attempted transient analysis at the ignition off condition just after 8%, 50kph uphill driving.
Technical Paper

A Study on NVH Performance Improvement of TPE Air Intake Hose Based on Optimization of Design and Material

Environmental and fuel economy regulations (Eu 6d and WLTP RDE) on automobiles have been tightened recently. To counter this regulation, the global automobile industry is focusing on weight reduction, fuel efficient turbo charger, cooled EGR, thermal management, low friction and so on. However, the high-speed turbocharger makes turbulence, and resulting in airflow noise. This noise is transmitted indoor through the air intake system, which adversely affects the vehicle's competitiveness. Therefore, for turbo engine, it is essential to reduce the noise of the air intake system. The air intake system consists of air cleaner, air filter, air intake hose and air duct. The air flow noise of turbo-engine is mainly the emission noise emitted from the walls of air intake system. And the transfer path of turbo noise is in order of air intake hose, air cleaner and air duct. Therefore, it is effective to reduce the noise of the air intake hose located at the beginning of noise transfer path.