CFD-aided design of mixers for the urea injection

The performance of a Selective Catalytic Reduction SCR systems in a modern Diesel engines is strongly related to the urea-water solution injection system, to vaporization of liquid droplets, decomposition of urea vapor to ammonia (NH3) and mixing of the NH3 vapor from the urea injector to the SCR catalyst inlet. To improve the evaporation and the mixing of urea vapor with the exhaust gas, passive flow mixing devices (mixers) are commonly adopted in SCR systems.

Automatic gasket tuning optimization algorithms

The cooling system has a key role in the design process of diesel engines: it allows the survival and the durability of the hottest components; also, performances and emissions are related to its efficiency.

Main aim of the system is to prevent cracks and thermal fatigue stress in base engine components: head and block first of all; for these components, a fluid core (cooling jacket) surrounds the hot surfaces related to the combustion and has to be designed as a main component of the system.

Pulley blade shape optimization using Optimate+

Target is to design optimized blade shape on a pulley in order to cool down a rubber that drag a belt.

The blade shape designs are optimized using Optimate+ and  STAR-CCM+® 3D CAD model.

Parameters are defined and 100 simulations are launched in order to find the best design.

Steady simulations are performed with rotation, and the best design giving high heat transfer coefficient and high velocity is found.