The Inlet Average Absolute Flow Angle Effect on Mixed Inflow Turbine Rotor Performances

The turbocharger’s function is to compress more air flowing into the engine cylinder. Typically, the mixed inflow turbines are used as a prime mover in a turbocharger assembly and, it is important to define the critical operating point parameters of this turbine type. These parameters cannot be chosen arbitrarily, as they greatly influence sizing and performance. Initially, these parameters are fixed beforehand, to optimize everything that distinguishes the performance and primary dimensions of the turbine. The geometric quantities as well as the deceleration coefficients intervene in the determination of the optimal flow sections in the machines by taking into account the modification concerning the ratio between the useful work obtained and the energy quantity expended. In this way, a one-dimensional preliminary design turbine study is based not only on the operating point parameters but also on a suitable choice of other parameters which must ensure that the objective set at the start is achieved according to the use needs. This study presentsthe inlet average absolute flow angle of rotor type A (constant inlet blade angle) effect on the mixed inflow turbine rotor performances at a steady regime to achieve the best operating conditions, this angle is ensured by the spiral volute shape or by a vane grid. A mathematical model based on the Bezier polynomial was used to generate the blade shape. To solve averaged Navier Stokes equations describing three-dimensional flow; viscous and complex which passes through the interblade channel the cfx.15 was used as a calculation code.