A Robust Adiabatic Model for a Quasi-Steady Prediction of Far-Off Non-Measured Performance in Vaneless Twin-Entry or Dual-Volute Radial Turbines

Applied Sciences

JoséRamón Serrano¹  LuisMiguel García-Cuevas¹  FranciscoJ. Arnau¹  Vishnu Samala¹ 

[1] CMT-Motores Térmicos, Universitat Politècnica de València, Camino de Vera s/n, 46022 València, Spain;

关键词: turbocharger;    twin-entry radial turbines;    dual-volute radial turbines;    unequal and partial flow admission;    quasi-steady models;    adiabatic efficiency model;    reduced mass flow model;   

DOI  :  10.3390/app10061955

来源: DOAJ

【 摘 要 】

The current investigation describes in detail a mass flow oriented model for extrapolation of reduced mass flow and adiabatic efficiency of double entry radial inflow turbines under any unequal and partial flow admission conditions. The model is based on a novel approach, which proposes assimilating double entry turbines to two variable geometry turbines (VGTs) using the mass flow ratio ( $\mathit{MFR}$ ) between the two entries as the discriminating parameter. With such an innovative approach, the model can extrapolate performance parameters to non-measured $\mathit{MFR}$ s, blade-to-jet speed ratios, and reduced speeds. Therefore, the model can be used in a quasi-steady method for predicting double entry turbines performance instantaneously. The model was validated against a dataset from two different double entry turbine types: a twin-entry symmetrical turbine and a dual-volute asymmetrical turbine. Both were tested under steady flow conditions. The proposed model showed accurate results and a coherent set of fitting parameters with physical meaning, as discussed in this paper. The obtained parameters showed very similar figures for the aforementioned turbine types, which allows concluding that they are an adequate set of values for initializing the fitting procedure of any type of double entry radial turbine.

【 授权许可】

Unknown