Piston engine intake and exhaust system design
Abstract
The aim of intake and exhaust system design is to control the transfer of acoustic energy from the sources and its emission by the system with minimal loss of engine performance. A rational design process depends on the adoption of a design methodology based on predictive modeling of acoustic behavior. Virtually any system geometry can be modeled by breaking it down to a sequence of simple elements or chambers. An initial design layout is then produced with simple parametric models of individual element behavior. This design is then refined to prototype level by systematic modification of detail using realistic assessments of system performance in its operational environment. Following prototype validation by practical testing, further necessary development is again assisted by predictive modeling. The application of appropriate procedures is illustrated by a series of practical examples. These concern improvements in interior noise by control of intake noise, of vehicle performance by reducing flow losses, of the environment by control of exhaust emissions, and lastly with the control of flow noise. The report concludes with a brief outline of current and new developments involving integrated design procedures.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- July 1993
- Bibcode:
- 1993STIN...9413874D
- Keywords:
-
- Acoustic Emission;
- Control Systems Design;
- Engine Inlets;
- Exhaust Emission;
- Exhaust Systems;
- Intake Systems;
- Noise Reduction;
- Piston Engines;
- Prediction Analysis Techniques;
- Propulsion System Performance;
- Environmental Control;
- Mathematical Models;
- Sound Waves;
- Mechanical Engineering