Multidisciplinary Optimization of a Turbocharger Radial Turbine

Abstract

This paper presents a multidisciplinary design optimization of a turbocharger radial turbine for automotive applications with the aim to improve two major manufacturer requirements: the total-to-static efficiency and the moment of inertia of the radial turbine impeller. The search for the best design is constrained by mechanical stress limitations, by the mass flow and power, and by aerodynamic constraints related to the isentropic Mach number distribution on the rotor blade. The optimization of the radial turbine is performed with a two-level optimization algorithm developed at the von Karman Institute for Fluid Dynamics (VKI). The system makes use of a Differential Evolution algorithm, an Artificial Neural Network (ANN), and a database as a compromise between accuracy and computational cost. The ANN performance predictions are periodically validated by means of accurate steady state 3D Navier-Stokes and centrifugal stress computations. The results show that it is possible to improve the efficiency and the moment of inertia only in a few numbers of iterations while limiting the stresses to a maximum value. Based on the large number of evaluated designs during the optimization, this paper provides design recommendations of a turbocharger radial turbine at least for a good preliminary design.

Design and control characteristics of a low pressure UWCAES turbine

“…w turbodoładowarkach silników spalinowych. Stopień tego typu charakteryzuje się wysoką sprawnością, a ze względu na dobre właściwości strukturalne geometrii promieniowo-osiowego koła wirnikowego możliwe jest obciążenie go znacznym spadkiem entalpii [5,6].…”

Flow characteristic of a multistage radial turbine for supercritical compressed air energy storage system

“…In the present study, the supercritical air is employed to reduce site area and increase the energy density of CAES system, 16 so the compressed air in the multistage radial turbine expands from supercritical to atmospheric conditions to obtain higher output power, which differs from the ordinary operating condition of radial turbines (Figure 1). 16–23 In addition, radial turbines, which are shrouded and unshrouded rotors with different blade profile, are all included in the multistage radial inflow turbine to meet the requirement of operation condition, thus it is difficult for the engineers to determine the stage that has higher flow loss to conduct performance improvement. Although some studies 24 has been conducted on the aerodynamic performance and internal flow patterns of multistage radial inflow turbine, the effects of supercritical condition and geometric parameters on the aerodynamic performance and flow characteristic of multistage radial turbine in CAES system is also still not revealed.…”

Improved thermodynamic and aerodynamic design method and off‐design performance analysis of a radial inflow turbine for ORC system

“…The essentiality of design method and off-design performance analysis in the investigation of it was stressed in many studies. [16][17][18] Numbers of research studies on ORC system have been conducted recently. [19][20][21] Awais Ahmed et al 22 presented a design method for the ORC system in a cement factory.…”