Experimental validation of a quasi-two-dimensional radial turbine model

Abstract

<jats:p> This article presents the experimental validation of a quasi-two-dimensional radial turbine model able to be used in turbocharged reciprocating internal combustion engine simulations. A passenger car variable-geometry turbine has been tested under steady and pulsating flow conditions, instrumented with multiple pressure probes, temperature sensors and mass flow sensors. Using the data obtained, a pressure decomposition has been performed. The pressure at the turbine inlet and outlet has been split into forward and backward travelling waves, employing the reflected and transmitted waves to verify the goodness of the model. The experimental results have been used to compare the quasi-two-dimensional radial turbine model as well as a classic one-dimensional model. The quasi-two-dimensional code presents a good degree of correlation with the experimental results, providing better results than the one-dimensional approach, especially when studying the high-frequency spectrum. </jats:p>

Radial turbine sound and noise characterisation with acoustic transfer matrices by means of fast one-dimensional models

“…The objective of this section is to evaluate the performance of the IATM method in terms of turbine acoustic prediction when compared to conventional one-dimensional simulations, as well as to demonstrate its potential and simple implementation. With this purpose, an experimental validation with the data obtained by Galindo et al 26 is first presented. Second, a sensitivity study in terms of interpolation mesh resolution is performed to explore the strengths and limitation of the method.…”

“…The simulation results that are presented in this study were obtained using OpenWAM, 37 the one-dimensional simulation integrated tool developed in CMT – Motores Térmicos, modified from its finite-differences 38 formulation to a finite-volume formulation. The method is described in Galindo et al 26 and summarised in the Appendix 2.…”

“…The results of the model are compared against a small set of experimental acoustic data, showing good agreement of the sound pressure level of the forward- and backward-travelling pressure waves in the frequency domain. The work of the present article is based on the models presented by Galindo et al, 26 where their previous model 22 is adapted to use the work by Serrano et al 27 to interpolate and extrapolate the turbine map in terms of adiabatic efficiency and mass flow. The frequency domain results showed good agreement against experimental data, with good capabilities to extrapolate to extreme off-design conditions.…”

Experimental validation of a one-dimensional twin-entry radial turbine model under non-linear pulse conditions

“…The effect that the addition of an intermediate volume produces has been deeply studied previously, 12 producing significant improvements in the prediction for the middle- and high-frequency spectra.…”

“…Investigators have also performed different experiments for pulsating flow in single-entry turbines, such as Torregrosa et al 7 or Serrano et al 8 for unsteady and off-design performance, Torregrosa et al 9 for diesel engines or Hohenberg et al 10 Piscaglia et al 11 show an interesting approach measuring the instantaneous pressure, temperature and mass flow in different points in the turbine inlet duct and the turbine outlet duct. Galindo et al 12 present a similar experimental methodology as the one presented in this article, being applied for a variable geometry turbine (VGT). Finally, Cappelaere et al 13 present a new test methodology for testing turbochargers under highly pulsating conditions.…”