Journal article
Impact of Design Constraints on Noise and Emissions of Derivative Supersonic Engines
Journal of propulsion and power, Vol.39(3), pp.454-463
05/01/2023
Appears in Aviation Sustainability Center (ASCENT)
Abstract
The propulsion systems used in commercial supersonic transport (SST) aircraft, such as the Concorde, have used repurposed engines or derivative engines based on cores from existing donor engines rather than purpose-designed clean-sheet engines. A similar approach is currently being adopted in the development of new SSTs. Turbomachinery components and cooling mass flow rates in derivative engines are sized by the design cycle of the donor engine and constrain the design of the derivative engine cycle. Here, we identify the constraints imposed by the donor engines and quantify their impact on the specific fuel consumption (SFC), certification noise, and NOx (oxides of nitrogen) emissions index [EI(NOx)] relative to purpose-designed clean-sheet engines. We design and optimize a clean-sheet and derivative engine for a notional 55 metric ton SST proposed by NASA. A clean-sheet engine optimized for SFC results in an approximately 4.5% reduction in SFC, an approximately 2.5-fold increase in EI(NOx), and a 1.2 EPNdB increase in certification noise relative to the derivative engine. Applying a constraint on EI(NOx) to the clean-sheet engine results in an approximately 0.5% reduction in SFC relative to the derivative engine. The work provides a quantitative comparison of clean-sheet purpose-built engines and derivative engines from an environmental perspective that can inform policy makers as they develop updated environmental standards for civil supersonic aircraft.
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Details
- Title
- Impact of Design Constraints on Noise and Emissions of Derivative Supersonic Engines
- Creators
- Prakash Prashanth - Massachusetts Institute of TechnologyLaurens J. A. Voet - Massachusetts Institute of TechnologyRaymond L. Speth - Massachusetts Institute of TechnologyJayant S. Sabnis - Massachusetts Institute of TechnologyChoon S. Tan - Massachusetts Institute of TechnologySteven R. H. Barrett - Massachusetts Institute of Technology
- Publication Details
- Journal of propulsion and power, Vol.39(3), pp.454-463
- Academic Unit
- Aviation Sustainability Center (ASCENT); Emissions
- Publisher
- Amer Inst Aeronautics Astronautics
- Number of pages
- 10
- Grants
- 13-C-AJFE-MIT-052, Federal Aviation Administration (United States, Washington) - FAA13-C-AJFE-MIT-059, Federal Aviation Administration (United States, Washington) - FAA
- Grant note
- U.S. Federal Aviation Administration Office of Environment and Energy through Aviation Sustainability Center (ASCENT) 13-C-AJFE-MIT / Federal Aviation Administration Center of Excellence for Alternative Jet Fuels and the Environment, project 47 through Federal Aviation Administration
- Identifiers
- 99901007835901842
- Copyright
- Presented as Paper 2021-1272 at the AIAA SciTech 2021 Forum in the Supersonics Session, Virtual, January 11–21, 2021; received 26 May 2022; revision received 27 October 2022; accepted for publication 16 January 2023; published online Open Access
- Language
- English
- Resource Type
- Journal article