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Model Design and Manufacturing of the Turbofan Configuration for Low Speed Aerodynamic and Acoustic Testing

Final Report Summary - LOSPA (Model Design and Manufacturing of the Turbofan Configuration for Low Speed Aerodynamic and Acoustic Testing)

Executive Summary:
There is increasing concern about the adverse environmental effects of aircraft engine noise which has resulted in the need to identify methods for reducing or shielding noise for aircraft in flight. A number of research programmes have been undertaken to develop novel empennage configurations for a business jet and this LOSPA project will provide a new wind tunnel model to be used in a future wind tunnel test campaign to investigate the effectiveness of new aircraft geometry in promoting noise reduction; specifically a novel empennage design and laminar flow wing configuration.

The empennage will comprise a ‘U-tail’ design, in which the horizontal tailplanes act as physical shields to reduce the noise detected on the ground arising from the rear fuselage mounted engines. Removable vertical tailplanes will be developed to reduce the noise emanating laterally from the aircraft.

The key areas of progressive development of this model include the introduction of Turbine Power Simulators into the rear fuselage mounted nacelles to simulate the engine effects, adaption of the empennage design to produce a non ‘U-tail’ configuration, plus the introduction of steady and unsteady pressure measurement sensors into the nacelles and empennage components to measure both the aerodynamic and acoustic characteristics of the new design.

The new model design will be of modular construction such that testing can be performed in a variety of model configurations including testing with vertical tailplanes removed and powerplant removed. From this progressive approach, the aerodynamic and acoustic characteristics of this novel design will be fully-investigated to ascertain its effectiveness in achieving the perceived reduction in engine noise and the improvement in wing performance and low speed handling qualities.

The result of this work will promote the development of future aircraft designs with enhanced environmental characteristics (lower noise levels and improved efficiency of operation).
This Periodic Report relates to the entire project from 1 Nov 2011 until 31 Dec 2014

Project Context and Objectives:
The objectives within the framework of this overall project are:-

• Design and manufacture of the rear tail Empennage and Nacelles, including a Stress Report and Inspection Report where appropriate

• The Empennage would incorporate a ‘U-tail’ arrangement of HTP and VTP, and the Nacelles would be fully instrumented for integration of TPS units supplied externally

• Design and manufacture of a set of high aspect ratio wings which will have removable leading edges and trailing edge flaps

• These items would be designed to interface with the remainder of the model which would be provided by a partner independent of this CfP

• Complete the final assembly of all new hardware to the supplied fuselage, and deliver to the DNW test facility in preparation for aerodynamic and acoustic testing

Project Results:
The overall aim of this programme of work is to provide a wind tunnel model which facilitates an efficient, productive wind tunnel test campaign and the acquisition of valuable acoustic and aerodynamic data to permit the novel aircraft design to be evaluated This will provide an experimental data set which can be used to obtain a thorough understanding of the complex flow field around the LOSPA model nacelles and empennage, and the handling/performance of the novel aircraft design.
The wind tunnel model and measurement techniques developed during this programme of work will be available for use in future experimental investigations.

Potential Impact:
This information will be utilised in the design of future aircraft in order to reduce the noise levels detected on the ground, emanating from aircraft engines. This will assist in reducing the problem of environmental impact and provide the community with a better living environment.
The improved aerodynamic performance of future aircraft will also result in a reduction of noise generation which will produce significant benefits to the local environment

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