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Development of a tracer gas method to determine the mixing efficiency of aeronautical mix manifolds

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Abstract

The purpose of the mixing unit (MU) in a passenger aircraft is to intermingle pre-conditioned air from outside the aircraft with recirculating air from inside the aircraft. In this paper, a detailed description of measurements of the mixing performance of an MU-prototype using a tracer gas is given. The tracer gas utilized for these investigations is carbon dioxide which is injected at some inlet of the MU. Subsequently, the concentration of CO2 is determined at each of the various outlets of the MU. The results of the tracer gas measurements are compared with the scale resolving computational fluid dynamics simulations performed with the SAS–SST turbulence model on the one hand and large eddy simulation on the other hand.

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Notes

  1. The maximum CO2 concentration measured in the laboratory during the experiments never exceeded 1,500 ppmv. Since this value is much lower than the MAK-limit of 5,000 ppmv, no danger for human health was encountered in the laboratory.

  2. Results of the SAS–SST and LES simulations revealed that the deviation of the maximum and minimum mass fraction over the outlet area for S1 and S2 at outlet 7 is 6.5%. The deviations of all other mass fractions at the outlets are at most 1.4%.

  3. The measurement time, including the determination of two reciprocal measurement sequences, is <2 h.

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Authors and Affiliations

  1. FH JOANNEUM GmbH, Alte Poststraße 149, 8020, Graz, Austria

    A. Tramposch, W. Hassler & B. Wiesler

Authors
  1. A. Tramposch
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  2. W. Hassler
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  3. B. Wiesler
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Corresponding author

Correspondence to A. Tramposch.

Additional information

This paper is based on a presentation at the German Aerospace Congress, September 27–29, 2011, Bremen, Germany.

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Tramposch, A., Hassler, W. & Wiesler, B. Development of a tracer gas method to determine the mixing efficiency of aeronautical mix manifolds. CEAS Aeronaut J 2, 279–288 (2011). https://doi.org/10.1007/s13272-011-0023-7

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  • DOI: https://doi.org/10.1007/s13272-011-0023-7

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