Concepts for reducing exhaust emissions and fuel consumption of the aircraft piston engineA study was made to reduce exhaust emissions and fuel consumption of a general aviation aircraft piston engine by applying known technology. Fourteen promising concepts such as stratified charge combustion chambers, cooling cylinder head improvements, and ignition system changes were evaluated for emission reduction and cost effectiveness. A combination of three concepts, improved fuel injection system, improved cylinder head with exhaust port liners and exhaust air injection was projected as the most cost effective and safe means of meeting the EPA standards for CO, HC and NO. The fuel economy improvement of 4.6% over a typical single engine aircraft flight profile does not though justify the added cost of the three concepts, and significant reductions in fuel consumption must be applied to the cruise mode where most of the fuel is used. The use of exhaust air injection in combination with exhaust port liners reduces exhaust valve stem temperatures which can result in longer valve guide life. The use of exhaust port liners alone can reduce engine cooling air requirements by 11% which is the equivalent of a 1.5% increase in propulsive power. The EPA standards for CO, HC and NO can be met in the IO-520 engine using air injection alone or the Simmonds improved fuel injection system.
Document ID
19790052724
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rezy, B. J. (Teledyne Continental Motors Mobile, AL, United States)
Stuckas, K. J. (Teledyne Continental Motors Mobile, AL, United States)
Tucker, J. R. (Teledyne Continental Motors Mobile, AL, United States)
Meyers, J. E. (Teledyne Continental Motors Mobile, Ala., United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1979
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
SAE PAPER 790605
Meeting Information
Meeting: Society of Automotive Engineers, Business Aircraft Meeting and Exposition