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LOW NOx EMISSIONS COMBUSTOR BEGINS TESTS AT P&W

 PARIS, June 11 /PRNewswire/ -- A new, two-stage combustor designed to significantly reduce emissions of oxides of nitrogen (NOx) initiated engine testing this month at Pratt & Whitney's main facility to evaluate its operational characteristics before adaptation to P&W commercial jet engines.
 The axially staged combustor's (ASC) first application will be in the International Aero Engines (IAE) V2500-A5 engines; P&W is a 30 percent partner in the five-nation IAE consortium. Certification of the combustor in the V2500 is expected in late 1995. An ASC combustor also will be adapted to Pratt & Whitney's PW4000 engine for wide-body aircraft and will be applied to future P&W engines now in development.
 The combustor was installed for the first time in a full-scale V2500 engine, after a series of full-scale, high-pressure rig tests at Pratt & Whitney, and began full operational tests runs the second week of June. These initial tests will include starting, acceleration and deceleration to evaluate the operational capability of the two-stage design and to obtain the first assessment of emissions in the engine environment. Emissions data obtained will be used to confirm results obtained in the earlier component tests.
 The new combustor employs two fuel injection stages -- with two sets of independent fuel nozzles -- rather than the single injection stage used in current engines. The main fuel stage is axially downstream from the pilot stage, which is located at the front end of the combustor.
 The pilot stage alone is used for ignition and idle. Both stages, however, are fueled at the engine's high-power conditions of takeoff and climb, as well as cruise, because these flight stages typically consume the most fuel. The greatest amount of NOx is formed where the most fuel is burned.
 In the new combuster, the proportion of fuel to air used in the combustion process at high power is relatively low, or lean, and the mixture spends a shorter time at high temperature compared to current- technology combustors. Because NOx is primarily a product of a high- temperature reaction of oxygen and nitrogen, the fuel-lean, low- temperature environment of the axially staged combustor, therefore, will generate lower levels of NOx emissions than is possible today.
 Conversely, a fuel-rich mixture is used with the pilot stage at engine idle, significantly reducing unburned hydrocarbon and carbon monoxide emissions. Full authority digital electronic controls modulate the fuel-air proportions for optimum emissions at idle, takeoff and cruise.
 Although the contribution of aviation pollution to environmental damage has been considered and judged to be small compared to other man- made sources, there are still reasons to justify the reduction of oxides of nitrogen. There is a risk of concentrated NOx emissions in airport areas and in the stratosphere.
 Engine emissions of NOx today are less than 50 percent of the levels some 20 years ago, and the new technology in the V2500 combustor will contribute further reductions. The axially staged combustor will reduce NOx emissions by more than 35 percent in airport vicinities and by about 50 percent at cruise.
 International Aero Engines is an international collaboration consisting of Pratt & Whitney, Rolls-Royce, MTU, Fiat and JAEC of Japan.
 Pratt & Whitney is a unit of United Technologies Corporation (NYSE: UTI), based in Hartford, Conn.
 -0- 6/11/93
 /CONTACT: Bob Goehring of Pratt & Whitney, 203-565-2518/
 (UTI)


CO: Pratt & Whitney ST: Connecticut IN: ARO SU:

DJ -- NE005 -- 1163 06/11/93 15:26 EST
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Date:Jun 11, 1993
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