Simulation Optimization of a New Twin-entry Turbocharger Turbine with Double Incidence Angles

Paper #:
  • 2017-01-2419

  • 2017-10-08
This paper discusses the performances and the mass flow characteristics of a new twin-entry turbocharger turbine with a fixed nozzle entry and a nozzleless entry for automotive application. Because the configuration based on a conventional twin-entry nozzleless turbine has both a fixed nozzle entry and nozzleless entry, and the fixed nozzle entry and the nozzleless entry have different turbine incidence angles, stratified flow is formed in the turbine inlet. The numerical simulation results show that the new turbine with double incidence angles has higher efficiency compared to the original twin-entry nozzleless turbine, especially in low-speed conditions, which can greatly improve the low-speed torque of engine, despite the fact that the new turbine has a bit smaller mass flow than the original. Through the investigation of the alternative installation locations of the fixed nozzle, it is beneficial to improve the turbine efficiency that the fixed nozzle is set at the volute limb near the turbine outlet. Because of the pivotal role that the installation angle of the nozzle guide vane of turbine plays in the process of exhaust energy conversion, the influence of the installation angle on the turbine performances was studied in order to optimize the installation angle and find out the change rules of the turbine efficiency and mass flow. Based on the comprehensive analysis on these rules, it shows that 60。vane angle is the optimal. This paper introduces the concept of the double turbine incidence angles and explains the works of the turbine with stratified flow.
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