Methodology

The four steps involved in the RTD work are:
  1. Assessment, through detailed experimental campaigns, of the flow and acoustic interactions taking place between representative components of an industrial ECS --> WP2;
  2. Development or upgrade of innovative aeroacoustic simulation strategies, accounting for the mutual interactions between ECS components in a CPU-cost effective way --> WP3;
  3. Application of the new or improved aeroacoustic simulation tools to the configurations measured in WP2, and validation of the modelling approaches and assumptions --> WP4;
  4. Investigation of promising control approaches for noise reduction --> WP5.

The consortium has an extensive track record in the application of the numerical techniques and experimental diagnostics, and advanced tools are already in place at most of the partners. Therefore, no major development of the experimental techniques will be required. The six work packages are structured as follows:

  • WP1 coordinates the different strands of work in IDEALVENT.
  • WP2 is focused on the experimental characterization of flow-acoustic and multi-component interactions. The purpose is to identify configurations that are relevant to the industrial application, and to provide exhaustive experimental databases permitting to i) understand the interactions mechanisms, ii) guide the methods developments in WP3, and iii) validate their application in WP4. In Task 2.1, the consortium will detail the geometrical dimensions and range of flow regimes that will be investigated in Task 2.2. In Task 2.2, a preliminary fast acoustic survey will be conducted on the configurations defined in Task 2.1, in order to identify relevant flow conditions that will be investigated experimentally in greater detail in subsequent Tasks of WP2 and simulated in WP4. The relevant configurations will be decided, under supervision of LTS and EMB, on the basis of the measured acoustic spectra compared with existing datasets made available by these final users. In Task 2.3, detailed flow and acoustic measurements will be performed for the valve-bend configuration. In Task 2.4, detailed flow and acoustic measurements will be performed for the fan with inflow distortion case. In Task 2.5, detailed flow and acoustic measurements will be performed for the fan with downstream obstacle case. In Task 2.6, EMB will perform acoustic measurements of one of its aircrafts grounded in its apron environment. These complementary measurements will provide further insight as to the best simulation strategies to be implemented in WP3 and applied in WP4, as well as to the most promising control approaches to be tested in WP5.
  • WP3 deals with the development of innovative simulation methodologies accounting for the interaction effects. The objective is to define the best combination of scale-resolved and statistical/stochastic approaches, and their interfacing scheme through boundary conditions. In Task 3.1, the specifications for combining complementary simulation strategies will be detailed by all partners involved in the simulation tasks. In Task 3.2, the boundary conditions and interfaces required by the simulation tools will be investigated and implemented. In Task 3.3, innovative scale-resolved and statistical approaches will be developed and improved for fan noise prediction. In Task 3.4, innovative scale-resolved and statistical approaches will be developed and improved for ducted turbulence noise prediction. In Task 3.5, an integrated multi-components network model simulation method will be derived and implemented.
  • WP4 foresees the application of the tools integrated in WP3. The butterfly valve with upstream bend, fan with inlet distortion, and fan with downstream obstacle are targeted in Tasks 4.1, 4.2 and 4.3 respectively. The validated numerical databases will provide an unprecedented insight into the interaction mechanisms taking place in complex ventilation systems.
  •  WP5 exploits the outcomes of WP4, complemented and validated by the experimental data gathered in WP2, to introduce noise mitigation strategies through passive flow and acoustic control. Porous liners and micro-perforates are proposed in Task 5.1. Turbulence screens will be tested in Task 5.2.

  • Finally, WP6 integrates the outcomes of the previous WPs by providing guidelines on the integration of the sub-components of the ventilation system, and demonstrate their effectiveness in an industrial environment. The integration guidelines will include various recommendations, e.g. regarding the minimum distance to foresee between a fan or a valve, and an upstream or downstream singularity. Then, the most promising control approaches tested in WP5 on the laboratory configurations will be tested on full-scale industrial equipment provided by LTS. Finally, a critical analysis of the benefits to be expected for cabin and ramp noise will be finally checked against the targeted impacts of the Work Programme 2012 and relevant regulations.