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by the year 2000 the FAA will likely

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require further reductions in aircraft

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noise more than a decade of research and

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development by the Aeronautics industry

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has focused on compliance after two

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years of wind tunnel tests a model

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designed to meet that proposed FAA

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standard it's crated and shipped for

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further testing designed by pratt &

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whitney a division of united

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technologies the model was tested in two

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of the six wind tunnels at NASA Lewis

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Research Center in Cleveland Ohio the

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joint effort between NASA and this

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leading manufacturer of aircraft engines

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explored the acoustics aerodynamic

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performance and the operability of the

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advanced ducted propeller known as the

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ADP initial indications are that from

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this new design a quieter better

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the model scaled to one-sixth of the

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actual design was tested here in this

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tunnel commonly called the 9 by 15 which

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are the dimensions of the wind chamber

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this tunnel is nested in the return leg

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of the eight by six tunnel while the

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eight by six has supersonic capabilities

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only the subsonic speeds were used to

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test the ADP for the arrow propulsion

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facilities and experiments division this

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project began over three years ago at

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that time Lewis engineers started

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working closely with Pratt & Whitney to

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define the test parameters for the model

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this preparation ensured that the wind

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tunnels and the model were ready for

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each other the tunnel control room is

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the hub of adp research state-of-the-art

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equipment allows researchers to collect

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valuable data and monitor testing at the

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close of this last day an engineer

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green light successful testing of any

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model requires the skills and talents of

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a number of people test day brings

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together those abilities in preparation

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two green lights

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blowing air

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and so begins the test the tunnel

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operators control tunnel systems to

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obtain desired air speeds the ADP was

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tested over a Mach number range from

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zero 2.85 the model operator controls

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rpms by regulating the compressed air to

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the models drive turbo rpms for the ADP

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ranged from windmill to 12300 during

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testing the models safety is ensured by

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continuous monitoring of vibration and

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temperatures the engineer who monitors

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stress ensures that the predetermined

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stress limits on blades stator veins and

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instrumentation are not exceeded the

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primary researcher has lead

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responsibility for all aspects of ADP

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testing ongoing communications about the

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tunnel and model aid the Lewis

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researcher in making decisions about

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each test condition the primary

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researcher is supported by a counterpart

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who helps monitor online test data all

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these people depend on the electronics

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engineer who has complete responsibility

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for the electronics in the model the

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hardware the instrumentation and the

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computer system the ADP is a gear-driven

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fan with variable pitch much like a

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turboprop however a duct encircles the

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fan to suppress noise generated by the

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researchers discuss a primary focus of

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various Inlet and spinner configurations

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were tested in the eighth by six to help

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determine aircraft noise affecting

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communities cabin noise affecting

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twelve microphones for these tests were

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mounted on a one-inch thick aluminum

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plate and suspended above the model they

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are calibrated daily to ensure accuracy

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Pratt & Whitney is kept informed during

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each phase of testing pratt & whitney's

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interest is supervised by company vice

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president william webb the testing here

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at lewis is possible because of the wind

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tunnel facilities here at lewis are

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capable of doing both performance

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testing and noise testing with one set

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up not many tunnels in the United States

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are capable of doing that lewis is

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developed what we call a rotating

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microphone that lets us measure noise

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and separate the things within the

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engine that create those noise such that

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if we have one component that's creating

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an offensive signal we can then work on

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that one component and not have to waste

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our time struggling through all of the

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engine that same focused approach

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characterized all of the acoustic

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testing which included blade angles

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inlets and spinners stator veins and

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angles of attack the other primary focus

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of a DP testing was aerodynamic

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during the past two years testing

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focused on four inlet spinner

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configurations and numerous blade angle

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settings mechanics were called on to

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make changes for each configuration

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hundreds of performance tests including

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investigation of thrust and drag

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resulted in thousands of test points a

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sheet laser flow test provides an image

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of reverse thrust necessary during

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landing the laser doppler velocimeter or

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LDV is a non intrusive measurement of

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velocity with light beams it was used to

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map the reverse thrust velocity profile

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to determine the operability of the ADP

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the model was tested at various angles

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of attack simulating takeoff and landing

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when modifications were necessary for a

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specific investigation model changes

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instrumentation and repairs were

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performed on site by Lewis experts

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minimizing any delays in the test

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program NASA researchers are responsible

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for accurate gathering of the real time

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data on the escort d+ computer system

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the laborious process of analyzing and

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interpreting the information will

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continue for several months researchers

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map a trend within the test data and

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determine engine noise and performance

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this helps to validate analytical codes

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ultimately leading to improved

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technology and design codes for future

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industry use our technology readiness

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development program is scheduled to run

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through 1995 we anticipate that it we

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could be ready to start the development

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of a commercial product in the 1994 to

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1995 time period if the market is there

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that would support the cost of

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developing a new product that would let

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us put an engine in service that is

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carrying revenue-generating passengers

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around the year 2000 NASA louis's

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leading role in long-range aeronautics

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research consistently places the center

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at the forefront of technology

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as flying on the ground for the model